Code
P1460
BMW
P — Powertrain
Heated Catalyst Heater Power Switch Temperature Sensor Electrical Bank 2
Views:
UK: 15
EN: 30
RU: 15
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
BUICK
P — Powertrain
Cooling Fan Control System
Views:
UK: 16
EN: 34
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
CADILLAC
P — Powertrain
Cooling Fan Control System
Views:
UK: 19
EN: 31
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
CHEVROLET
P — Powertrain
Cooling Fan Control System
Views:
UK: 18
EN: 31
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
CHRYSLER
P — Powertrain
Cooling Fan Control System
Views:
UK: 17
EN: 32
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
FORD
P — Powertrain
Wide Open Throttle Air Conditioning Cutoff Circuit Malfunction
Views:
UK: 16
EN: 31
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
GEO
P — Powertrain
Cooling Fan Control System Fault
Views:
UK: 17
EN: 38
RU: 17
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Send to email
Code
P1460
GM
P — Powertrain
Cooling Fan Control System
Views:
UK: 15
EN: 32
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
GMC
P — Powertrain
Cooling Fan Control System
Views:
UK: 21
EN: 32
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
HUMMER
P — Powertrain
Cooling Fan Control System
Views:
UK: 6
EN: 12
RU: 9
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
LAND ROVER
P — Powertrain
Circuit failure in interruption of the air conditioning with the accelerator open
Views:
UK: 4
EN: 9
RU: 4
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
LINCOLN
P — Powertrain
Wide Open Throttle Air Conditioning Cutoff Circuit Malfunction
Views:
UK: 20
EN: 34
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
MERCURY
P — Powertrain
Wide Open Throttle Air Conditioning Cutoff Circuit Malfunction
Views:
UK: 18
EN: 47
RU: 26
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
OLDSMOBILE
P — Powertrain
Cooling Fan Control System
Views:
UK: 16
EN: 30
RU: 17
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
Other
P — Powertrain
Wide open throttle A/C cutoff relay circuit
Views:
UK: 15
EN: 31
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
PLYMOUTH
P — Powertrain
Cooling Fan Control System
Views:
UK: 16
EN: 34
RU: 17
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1460
PONTIAC
P — Powertrain
Cooling Fan Control System
Views:
UK: 16
EN: 28
RU: 17
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1460
SAAB
P — Powertrain
Immobilizer Active
Views:
UK: 2
EN: 6
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1460
SATURN
P — Powertrain
Cooling Fan Control System
Views:
UK: 18
EN: 33
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1460
SUZUKI
P — Powertrain
Radiator Fan Control System Fault
Views:
UK: 17
EN: 27
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1460
VOLKSWAGEN
P — Powertrain
Exhaust Gas Temperature Control Bank 2 Limit Attained
Views:
UK: 15
EN: 27
RU: 16
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to the heated catalyst temperature sensor (Bank 2)
- Corroded, loose, or damaged connector/pins at the sensor or ECM
- Failed heated catalyst temperature sensor module or integrated switch/heater assembly
- Blown fuse or loss of power to the heater power switch circuit
- Poor or missing ground connection for the heater/sensor circuit
- Heat damage from exhaust, road debris, or previous repairs
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated/engine light on
- Possible limp-home behavior or reduced engine performance in some vehicles
- Heated catalyst/heater may fail to operate (increasing emissions)
- Failed emissions/inspection test (catalyst/heater related)
- Diagnostic trouble codes stored for heated catalyst/heater or related oxygen/catalyst circuits
What to check
- Use a scan tool: read stored codes, pending codes, and freeze-frame data; note related codes and readiness status
- Monitor live data for the heated catalyst temperature sensor and heater status for Bank 2; compare with Bank 1
- Visually inspect harness and connectors at the heated catalyst sensor and along routing to ECM for heat damage, chafing, corrosion, or pin pushing
- Perform a wiggle test while monitoring signal for intermittent changes
- Check for blown fuses and proper relay operation supplying the heater circuit
- Back-probe connector to check supply voltage, control signal (ECM output), and ground with key on and during commanded heater operation
Signal parameters
- Temperature sensor: NTC-type behavior — resistance decreases as temperature increases (measure with sensor cold and when warmed if safe)
- Temperature sensor voltage (back-probed): typically within 0.1–4.9 V depending on temperature and ECU pull-up — should change smoothly with temperature
- Heater power/control: likely switched battery voltage or PWM output from ECM when heater is commanded (0 V to battery voltage or PWM duty cycle)
- Compare Bank 2 sensor values to Bank 1 (if Bank 1 is known-good) to spot differences
Diagnostic algorithm
- Retrieve and record all related DTCs and freeze-frame data using a capable scan tool
- If multiple related codes exist, prioritize wiring/power/ground checks before component replacement
- Perform a careful visual inspection of the heated catalyst sensor, connector, and harness for heat damage, melted insulation, chafing, or corrosion; allow components to cool before touching
- Check fuses/relays for the heater power circuit and replace if faulty
- Back-probe the sensor connector with key ON: verify reference voltage/pull-up, sensor signal voltage, and ground presence; record values
- Command the heater ON using a diagnostic tool (if available) and observe control output and supply voltage; look for expected change (voltage or PWM)
- Disconnect the sensor and measure its resistance cold; if possible, apply controlled heat (heat gun briefly at safe distance) to confirm NTC resistance change. Do not use open flame and avoid overheating or touching hot exhaust
- Perform continuity/resistance checks between sensor connector and ECM harness pins to identify opens or shorts; check for short to ground or battery positive
- Repair any damaged wiring, connectors, or poor grounds. Replace the heated catalyst sensor/heater assembly if tests show the sensor/module is faulty.
- After repairs clear codes, perform a relearn if required, and road test to confirm the fault does not return and heater/sensor readings behave normally
- If wiring and sensor check good but fault persists, consider ECM input/driver fault and consult dealer-level diagnostics or replace ECM only after exhaustive verification
- Observe workshop safety: allow exhaust components to cool, use heat-resistant gloves, and secure vehicle on stable supports when working underneath
Likely causes
- Damaged connector or wiring chafing near the exhaust/catalyst causing intermittent open/short
- Failed temperature sensor or integrated heater/switch module on Bank 2
- Loss of supply or ground to the heater control circuit (fuse, relay, grounding strap)
- Corrosion at the sensor plug or pin making resistance/voltage readings invalid
Fault status
Status
Heated catalyst heater power switch temperature sensor electrical fault detected on Bank 2. Circuit open/short or invalid signal — heater function may be disabled. Inspect sensor, connector, supply, ground, and wiring to ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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