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Home / DTC / P0052 — HO2S Heater Control Circuit High Bank 2 Sensor 1

P0052 — HO2S Heater Control Circuit High Bank 2 Sensor 1

Detailed page for trouble code P0052.

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Code

P0052

Generic P — Powertrain

HO2S Heater Control Circuit High Bank 2 Sensor 1

Brand: Generic
Type: P — Powertrain
Views: UK: 12 EN: 32 RU: 48
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to battery voltage on the heater control wire
  • Open circuit or high resistance in heater control wiring or connector
  • Corroded or disconnected sensor connector
  • Blown fuse or failed relay supplying heater power
  • Failed oxygen sensor heater element
  • Faulty PCM/ECM output (rare)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Possible rough idle, hesitation or reduced drivability until sensor warms
  • Longer-than-normal sensor warm-up time and compromised closed-loop operation
  • Reduced fuel economy and increased emissions
  • Possible failed emissions/inspection test

What to check

  • Read and record freeze-frame and pending codes; check related DTCs
  • Verify battery voltage and charging system health
  • Visually inspect sensor connector and wiring for damage, corrosion or heat damage
  • Check fuse(s) and heater relay (if applicable) that supply O2 heater power
  • Use a scan tool to view heater status PIDs and command the heater ON/OFF if supported
  • Measure heater element resistance at the sensor (compare to service specification)

Signal parameters

  • Heater element DC resistance: typically a few ohms (consult vehicle spec) — expect low ohms, not open
  • Control circuit voltage (uncommanded): near battery voltage if shorted to 12V
  • Control circuit voltage (when PCM grounds the circuit): near 0 V if PCM is switching to ground
  • Heater current draw when active: typically under a few amps (depends on heater resistance)
  • Scan tool PID: O2 heater status (ON/OFF) and any commanded heater requests

Diagnostic algorithm

  1. Verify code: Erase codes and attempt to reproduce; confirm P0052 returns and note freeze-frame conditions.
  2. Visual inspection: With engine off, inspect Bank 2 Sensor 1 connector and wiring for corrosion, melted insulation, chafing, or heat damage. Repair any obvious damage.
  3. Check power/fuse/relay: Identify the heater power feed and any fuses/relays. Verify battery voltage present at the sensor power terminal (with ignition ON). Replace blown fuse or faulty relay as needed.
  4. Scan tool test: Use a capable scan tool to command the heater ON. Observe heater status PID and monitor the heater control circuit voltage while commanded.
  5. Isolate sensor: With ignition OFF, disconnect the sensor connector. Measure the heater element resistance across the heater terminals at the sensor. If open or out of spec, replace the sensor.
  6. Check for short to voltage: With the sensor disconnected and ignition ON, measure voltage on the PCM control wire. If it measures near battery voltage, there is a short-to-voltage in the wiring or a stuck power feed; trace and repair wiring.
  7. Check PCM switching/grounding: If no short is present on the harness, reconnect sensor and backprobe the control wire while commanding the heater ON. If PCM does not pull the circuit low (or shows unexpected voltages), suspect PCM or grounding issue.
  8. Wiring continuity and resistance: Perform continuity checks from the sensor connector to the PCM connector and to chassis ground where appropriate; repair any opens or high resistance.
  9. Replace component(s): Replace sensor if heater element is bad. Replace/repair wiring or connectors as required. Only consider PCM replacement after all wiring and sensor checks confirm no harness or sensor fault.
  10. Verify repair: Clear codes, perform readiness/drive cycle and confirm the code does not return and that heater operation is normal.

Likely causes

  • Pinched/damaged harness at exhaust or near engine causing short-to-voltage
  • Water intrusion/corrosion at sensor connector causing high voltage reading
  • Failed internal heater element inside the sensor
  • Blown or incorrect fuse or failed heater relay (if equipped)
  • PCM not switching/reading the control circuit correctly

Fault status

⚠️ Status
ECM detected an abnormally high voltage on the heater control circuit for Bank 2 Sensor 1 (upstream oxygen sensor). This indicates a possible short to battery voltage, open/short in the heater wiring, a failed heater element, or a control module issue.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P0135 P0155 P0036 P0053
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Code

P0052

HUMMER P — Powertrain

Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 2 Sensor 1

Brand: HUMMER
Type: P — Powertrain
Views: UK: 9 EN: 21 RU: 29
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to battery voltage on the heater control wire
  • Open circuit or high resistance in heater control wiring or connector
  • Corroded or disconnected sensor connector
  • Blown fuse or failed relay supplying heater power
  • Failed oxygen sensor heater element
  • Faulty PCM/ECM output (rare)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Possible rough idle, hesitation or reduced drivability until sensor warms
  • Longer-than-normal sensor warm-up time and compromised closed-loop operation
  • Reduced fuel economy and increased emissions
  • Possible failed emissions/inspection test

What to check

  • Read and record freeze-frame and pending codes; check related DTCs
  • Verify battery voltage and charging system health
  • Visually inspect sensor connector and wiring for damage, corrosion or heat damage
  • Check fuse(s) and heater relay (if applicable) that supply O2 heater power
  • Use a scan tool to view heater status PIDs and command the heater ON/OFF if supported
  • Measure heater element resistance at the sensor (compare to service specification)

Signal parameters

  • Heater element DC resistance: typically a few ohms (consult vehicle spec) — expect low ohms, not open
  • Control circuit voltage (uncommanded): near battery voltage if shorted to 12V
  • Control circuit voltage (when PCM grounds the circuit): near 0 V if PCM is switching to ground
  • Heater current draw when active: typically under a few amps (depends on heater resistance)
  • Scan tool PID: O2 heater status (ON/OFF) and any commanded heater requests

Diagnostic algorithm

  1. Verify code: Erase codes and attempt to reproduce; confirm P0052 returns and note freeze-frame conditions.
  2. Visual inspection: With engine off, inspect Bank 2 Sensor 1 connector and wiring for corrosion, melted insulation, chafing, or heat damage. Repair any obvious damage.
  3. Check power/fuse/relay: Identify the heater power feed and any fuses/relays. Verify battery voltage present at the sensor power terminal (with ignition ON). Replace blown fuse or faulty relay as needed.
  4. Scan tool test: Use a capable scan tool to command the heater ON. Observe heater status PID and monitor the heater control circuit voltage while commanded.
  5. Isolate sensor: With ignition OFF, disconnect the sensor connector. Measure the heater element resistance across the heater terminals at the sensor. If open or out of spec, replace the sensor.
  6. Check for short to voltage: With the sensor disconnected and ignition ON, measure voltage on the PCM control wire. If it measures near battery voltage, there is a short-to-voltage in the wiring or a stuck power feed; trace and repair wiring.
  7. Check PCM switching/grounding: If no short is present on the harness, reconnect sensor and backprobe the control wire while commanding the heater ON. If PCM does not pull the circuit low (or shows unexpected voltages), suspect PCM or grounding issue.
  8. Wiring continuity and resistance: Perform continuity checks from the sensor connector to the PCM connector and to chassis ground where appropriate; repair any opens or high resistance.
  9. Replace component(s): Replace sensor if heater element is bad. Replace/repair wiring or connectors as required. Only consider PCM replacement after all wiring and sensor checks confirm no harness or sensor fault.
  10. Verify repair: Clear codes, perform readiness/drive cycle and confirm the code does not return and that heater operation is normal.

Likely causes

  • Pinched/damaged harness at exhaust or near engine causing short-to-voltage
  • Water intrusion/corrosion at sensor connector causing high voltage reading
  • Failed internal heater element inside the sensor
  • Blown or incorrect fuse or failed heater relay (if equipped)
  • PCM not switching/reading the control circuit correctly

Fault status

⚠️ Status
ECM detected an abnormally high voltage on the heater control circuit for Bank 2 Sensor 1 (upstream oxygen sensor). This indicates a possible short to battery voltage, open/short in the heater wiring, a failed heater element, or a control module issue.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P0135 P0155 P0036 P0053
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Code

P0052

LAND ROVER P — Powertrain

High Voltage Heated Oxygen Sensor Heater Control Circuit (bank 2 sensor 1)

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 5 EN: 15 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to battery voltage on the heater control wire
  • Open circuit or high resistance in heater control wiring or connector
  • Corroded or disconnected sensor connector
  • Blown fuse or failed relay supplying heater power
  • Failed oxygen sensor heater element
  • Faulty PCM/ECM output (rare)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Possible rough idle, hesitation or reduced drivability until sensor warms
  • Longer-than-normal sensor warm-up time and compromised closed-loop operation
  • Reduced fuel economy and increased emissions
  • Possible failed emissions/inspection test

What to check

  • Read and record freeze-frame and pending codes; check related DTCs
  • Verify battery voltage and charging system health
  • Visually inspect sensor connector and wiring for damage, corrosion or heat damage
  • Check fuse(s) and heater relay (if applicable) that supply O2 heater power
  • Use a scan tool to view heater status PIDs and command the heater ON/OFF if supported
  • Measure heater element resistance at the sensor (compare to service specification)

Signal parameters

  • Heater element DC resistance: typically a few ohms (consult vehicle spec) — expect low ohms, not open
  • Control circuit voltage (uncommanded): near battery voltage if shorted to 12V
  • Control circuit voltage (when PCM grounds the circuit): near 0 V if PCM is switching to ground
  • Heater current draw when active: typically under a few amps (depends on heater resistance)
  • Scan tool PID: O2 heater status (ON/OFF) and any commanded heater requests

Diagnostic algorithm

  1. Verify code: Erase codes and attempt to reproduce; confirm P0052 returns and note freeze-frame conditions.
  2. Visual inspection: With engine off, inspect Bank 2 Sensor 1 connector and wiring for corrosion, melted insulation, chafing, or heat damage. Repair any obvious damage.
  3. Check power/fuse/relay: Identify the heater power feed and any fuses/relays. Verify battery voltage present at the sensor power terminal (with ignition ON). Replace blown fuse or faulty relay as needed.
  4. Scan tool test: Use a capable scan tool to command the heater ON. Observe heater status PID and monitor the heater control circuit voltage while commanded.
  5. Isolate sensor: With ignition OFF, disconnect the sensor connector. Measure the heater element resistance across the heater terminals at the sensor. If open or out of spec, replace the sensor.
  6. Check for short to voltage: With the sensor disconnected and ignition ON, measure voltage on the PCM control wire. If it measures near battery voltage, there is a short-to-voltage in the wiring or a stuck power feed; trace and repair wiring.
  7. Check PCM switching/grounding: If no short is present on the harness, reconnect sensor and backprobe the control wire while commanding the heater ON. If PCM does not pull the circuit low (or shows unexpected voltages), suspect PCM or grounding issue.
  8. Wiring continuity and resistance: Perform continuity checks from the sensor connector to the PCM connector and to chassis ground where appropriate; repair any opens or high resistance.
  9. Replace component(s): Replace sensor if heater element is bad. Replace/repair wiring or connectors as required. Only consider PCM replacement after all wiring and sensor checks confirm no harness or sensor fault.
  10. Verify repair: Clear codes, perform readiness/drive cycle and confirm the code does not return and that heater operation is normal.

Likely causes

  • Pinched/damaged harness at exhaust or near engine causing short-to-voltage
  • Water intrusion/corrosion at sensor connector causing high voltage reading
  • Failed internal heater element inside the sensor
  • Blown or incorrect fuse or failed heater relay (if equipped)
  • PCM not switching/reading the control circuit correctly

Fault status

⚠️ Status
ECM detected an abnormally high voltage on the heater control circuit for Bank 2 Sensor 1 (upstream oxygen sensor). This indicates a possible short to battery voltage, open/short in the heater wiring, a failed heater element, or a control module issue.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P0135 P0155 P0036 P0053
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Code

P0052

MITSUBISHI P — Powertrain

Oxygen sensor heater2(front)high

Brand: MITSUBISHI
Type: P — Powertrain
Views: UK: 7 EN: 19 RU: 28
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to battery voltage on the heater control wire
  • Open circuit or high resistance in heater control wiring or connector
  • Corroded or disconnected sensor connector
  • Blown fuse or failed relay supplying heater power
  • Failed oxygen sensor heater element
  • Faulty PCM/ECM output (rare)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Possible rough idle, hesitation or reduced drivability until sensor warms
  • Longer-than-normal sensor warm-up time and compromised closed-loop operation
  • Reduced fuel economy and increased emissions
  • Possible failed emissions/inspection test

What to check

  • Read and record freeze-frame and pending codes; check related DTCs
  • Verify battery voltage and charging system health
  • Visually inspect sensor connector and wiring for damage, corrosion or heat damage
  • Check fuse(s) and heater relay (if applicable) that supply O2 heater power
  • Use a scan tool to view heater status PIDs and command the heater ON/OFF if supported
  • Measure heater element resistance at the sensor (compare to service specification)

Signal parameters

  • Heater element DC resistance: typically a few ohms (consult vehicle spec) — expect low ohms, not open
  • Control circuit voltage (uncommanded): near battery voltage if shorted to 12V
  • Control circuit voltage (when PCM grounds the circuit): near 0 V if PCM is switching to ground
  • Heater current draw when active: typically under a few amps (depends on heater resistance)
  • Scan tool PID: O2 heater status (ON/OFF) and any commanded heater requests

Diagnostic algorithm

  1. Verify code: Erase codes and attempt to reproduce; confirm P0052 returns and note freeze-frame conditions.
  2. Visual inspection: With engine off, inspect Bank 2 Sensor 1 connector and wiring for corrosion, melted insulation, chafing, or heat damage. Repair any obvious damage.
  3. Check power/fuse/relay: Identify the heater power feed and any fuses/relays. Verify battery voltage present at the sensor power terminal (with ignition ON). Replace blown fuse or faulty relay as needed.
  4. Scan tool test: Use a capable scan tool to command the heater ON. Observe heater status PID and monitor the heater control circuit voltage while commanded.
  5. Isolate sensor: With ignition OFF, disconnect the sensor connector. Measure the heater element resistance across the heater terminals at the sensor. If open or out of spec, replace the sensor.
  6. Check for short to voltage: With the sensor disconnected and ignition ON, measure voltage on the PCM control wire. If it measures near battery voltage, there is a short-to-voltage in the wiring or a stuck power feed; trace and repair wiring.
  7. Check PCM switching/grounding: If no short is present on the harness, reconnect sensor and backprobe the control wire while commanding the heater ON. If PCM does not pull the circuit low (or shows unexpected voltages), suspect PCM or grounding issue.
  8. Wiring continuity and resistance: Perform continuity checks from the sensor connector to the PCM connector and to chassis ground where appropriate; repair any opens or high resistance.
  9. Replace component(s): Replace sensor if heater element is bad. Replace/repair wiring or connectors as required. Only consider PCM replacement after all wiring and sensor checks confirm no harness or sensor fault.
  10. Verify repair: Clear codes, perform readiness/drive cycle and confirm the code does not return and that heater operation is normal.

Likely causes

  • Pinched/damaged harness at exhaust or near engine causing short-to-voltage
  • Water intrusion/corrosion at sensor connector causing high voltage reading
  • Failed internal heater element inside the sensor
  • Blown or incorrect fuse or failed heater relay (if equipped)
  • PCM not switching/reading the control circuit correctly

Fault status

⚠️ Status
ECM detected an abnormally high voltage on the heater control circuit for Bank 2 Sensor 1 (upstream oxygen sensor). This indicates a possible short to battery voltage, open/short in the heater wiring, a failed heater element, or a control module issue.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P0135 P0155 P0036 P0053
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Keep it short and practical. Up to 500 characters.
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