Code
P1496
DODGE
P — Powertrain
5 Volt Supply Output Too Low
Views:
UK: 23
EN: 34
RU: 35
AI status
Completed
Completed
100%
Causes
- Short to ground on the 5V reference wiring
- Open or high-resistance connection in the 5V reference feed
- Corroded, damaged or loose sensor connector(s)
- Failed or internally shorted PCM/ECM 5V reference output
- Blown or bad fuse/fusible link supplying the PCM
- Low battery or poor charging system/engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Multiple sensor-related error codes or erratic sensor values
- Poor idle, hesitation, stalling or limp performance
- Hard starting or no-start condition in severe cases
- Reduced engine performance or fuel economy
- Intermittent faults that may change with movement of harness/connectors
What to check
- Retrieve freeze frame and all stored codes; note which sensors are involved
- Check battery voltage and charging system; repair low battery/charging faults first
- Inspect fuses and fusible links related to PCM power and reference circuits
- Visually inspect wiring harness and sensor connectors for damage, corrosion, pin push-out, or signs of arcing
- Backprobe 5V reference at PCM and at affected sensor connectors with key ON (engine OFF) and compare voltages
- Disconnect suspect sensors (one at a time) to see if 5V reference returns to normal (isolates shorted sensor)
Signal parameters
- Expected 5V reference (key ON, engine OFF): ~4.8–5.2 V (manufacturer tolerance may vary)
- Voltage should be stable (no significant ripple or drop) with key ON
- If a short exists, voltage may fall drastically toward 0V or fluctuate
- Under engine running conditions the reference should remain within tolerance; heavy loads or shorts will reduce voltage
Diagnostic algorithm
- Verify code P1496 and note freeze-frame/related codes. Clear codes and perform initial road/idle test to re-check.
- Check battery voltage and charging system. Repair charging/battery faults before proceeding.
- Check fuses/power to PCM and related fusible links. Replace any blown fuses and retest.
- Inspect wiring harness and connectors for damage at common sensor clusters and near routing points. Repair visible damage.
- With key ON (engine OFF), backprobe PCM 5V reference pin and measure voltage. Confirm expected ~5V.
- Measure 5V at each sensor connector that uses the reference. If one sensor shows low, disconnect that sensor and re-measure the reference at PCM.
- If disconnecting a sensor restores 5V, inspect/replace that sensor or its wiring (shorting component).
- If 5V is low at the PCM pin with all sensors disconnected, perform continuity/resistance tests from the PCM reference output to ground to check for internal short; consult wiring diagrams for correct pin locations.
- Repair any wiring harness faults, damaged connectors, or shorted sensors. After repairs clear codes and verify stable 5V and normal sensor readings.
- Replace PCM only if all wiring and sensor checks confirm the reference output is defective and manufacturer diagnostics indicate PCM failure.
Likely causes
- Short to ground on the 5V reference circuit (most likely)
- Damaged connector or wiring at a sensor cluster
- Blown/failed fuse or poor power/ground to the PCM
- Faulty PCM regulator/5V reference output (least likely; replace only after eliminating wiring faults)
Fault status
Status
PCM detected the 5-volt reference output below the expected threshold. This can affect multiple sensors that rely on the 5V reference. Investigate wiring, connectors, fuses, sensors and PCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1496
JEEP
P — Powertrain
5 Volt Supply Output Too Low
Views:
UK: 26
EN: 31
RU: 40
AI status
Completed
Completed
100%
Causes
- Short to ground on the 5V reference wiring
- Open or high-resistance connection in the 5V reference feed
- Corroded, damaged or loose sensor connector(s)
- Failed or internally shorted PCM/ECM 5V reference output
- Blown or bad fuse/fusible link supplying the PCM
- Low battery or poor charging system/engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Multiple sensor-related error codes or erratic sensor values
- Poor idle, hesitation, stalling or limp performance
- Hard starting or no-start condition in severe cases
- Reduced engine performance or fuel economy
- Intermittent faults that may change with movement of harness/connectors
What to check
- Retrieve freeze frame and all stored codes; note which sensors are involved
- Check battery voltage and charging system; repair low battery/charging faults first
- Inspect fuses and fusible links related to PCM power and reference circuits
- Visually inspect wiring harness and sensor connectors for damage, corrosion, pin push-out, or signs of arcing
- Backprobe 5V reference at PCM and at affected sensor connectors with key ON (engine OFF) and compare voltages
- Disconnect suspect sensors (one at a time) to see if 5V reference returns to normal (isolates shorted sensor)
Signal parameters
- Expected 5V reference (key ON, engine OFF): ~4.8–5.2 V (manufacturer tolerance may vary)
- Voltage should be stable (no significant ripple or drop) with key ON
- If a short exists, voltage may fall drastically toward 0V or fluctuate
- Under engine running conditions the reference should remain within tolerance; heavy loads or shorts will reduce voltage
Diagnostic algorithm
- Verify code P1496 and note freeze-frame/related codes. Clear codes and perform initial road/idle test to re-check.
- Check battery voltage and charging system. Repair charging/battery faults before proceeding.
- Check fuses/power to PCM and related fusible links. Replace any blown fuses and retest.
- Inspect wiring harness and connectors for damage at common sensor clusters and near routing points. Repair visible damage.
- With key ON (engine OFF), backprobe PCM 5V reference pin and measure voltage. Confirm expected ~5V.
- Measure 5V at each sensor connector that uses the reference. If one sensor shows low, disconnect that sensor and re-measure the reference at PCM.
- If disconnecting a sensor restores 5V, inspect/replace that sensor or its wiring (shorting component).
- If 5V is low at the PCM pin with all sensors disconnected, perform continuity/resistance tests from the PCM reference output to ground to check for internal short; consult wiring diagrams for correct pin locations.
- Repair any wiring harness faults, damaged connectors, or shorted sensors. After repairs clear codes and verify stable 5V and normal sensor readings.
- Replace PCM only if all wiring and sensor checks confirm the reference output is defective and manufacturer diagnostics indicate PCM failure.
Likely causes
- Short to ground on the 5V reference circuit (most likely)
- Damaged connector or wiring at a sensor cluster
- Blown/failed fuse or poor power/ground to the PCM
- Faulty PCM regulator/5V reference output (least likely; replace only after eliminating wiring faults)
Fault status
Status
PCM detected the 5-volt reference output below the expected threshold. This can affect multiple sensors that rely on the 5V reference. Investigate wiring, connectors, fuses, sensors and PCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1496
KIA
P — Powertrain
EGR Stepper Motor Malfunction Circuit 1 1.8L
Views:
UK: 32
EN: 31
RU: 42
AI status
Completed
Completed
100%
Causes
- Short to ground on the 5V reference wiring
- Open or high-resistance connection in the 5V reference feed
- Corroded, damaged or loose sensor connector(s)
- Failed or internally shorted PCM/ECM 5V reference output
- Blown or bad fuse/fusible link supplying the PCM
- Low battery or poor charging system/engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Multiple sensor-related error codes or erratic sensor values
- Poor idle, hesitation, stalling or limp performance
- Hard starting or no-start condition in severe cases
- Reduced engine performance or fuel economy
- Intermittent faults that may change with movement of harness/connectors
What to check
- Retrieve freeze frame and all stored codes; note which sensors are involved
- Check battery voltage and charging system; repair low battery/charging faults first
- Inspect fuses and fusible links related to PCM power and reference circuits
- Visually inspect wiring harness and sensor connectors for damage, corrosion, pin push-out, or signs of arcing
- Backprobe 5V reference at PCM and at affected sensor connectors with key ON (engine OFF) and compare voltages
- Disconnect suspect sensors (one at a time) to see if 5V reference returns to normal (isolates shorted sensor)
Signal parameters
- Expected 5V reference (key ON, engine OFF): ~4.8–5.2 V (manufacturer tolerance may vary)
- Voltage should be stable (no significant ripple or drop) with key ON
- If a short exists, voltage may fall drastically toward 0V or fluctuate
- Under engine running conditions the reference should remain within tolerance; heavy loads or shorts will reduce voltage
Diagnostic algorithm
- Verify code P1496 and note freeze-frame/related codes. Clear codes and perform initial road/idle test to re-check.
- Check battery voltage and charging system. Repair charging/battery faults before proceeding.
- Check fuses/power to PCM and related fusible links. Replace any blown fuses and retest.
- Inspect wiring harness and connectors for damage at common sensor clusters and near routing points. Repair visible damage.
- With key ON (engine OFF), backprobe PCM 5V reference pin and measure voltage. Confirm expected ~5V.
- Measure 5V at each sensor connector that uses the reference. If one sensor shows low, disconnect that sensor and re-measure the reference at PCM.
- If disconnecting a sensor restores 5V, inspect/replace that sensor or its wiring (shorting component).
- If 5V is low at the PCM pin with all sensors disconnected, perform continuity/resistance tests from the PCM reference output to ground to check for internal short; consult wiring diagrams for correct pin locations.
- Repair any wiring harness faults, damaged connectors, or shorted sensors. After repairs clear codes and verify stable 5V and normal sensor readings.
- Replace PCM only if all wiring and sensor checks confirm the reference output is defective and manufacturer diagnostics indicate PCM failure.
Likely causes
- Short to ground on the 5V reference circuit (most likely)
- Damaged connector or wiring at a sensor cluster
- Blown/failed fuse or poor power/ground to the PCM
- Faulty PCM regulator/5V reference output (least likely; replace only after eliminating wiring faults)
Fault status
Status
PCM detected the 5-volt reference output below the expected threshold. This can affect multiple sensors that rely on the 5V reference. Investigate wiring, connectors, fuses, sensors and PCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1496
LAND ROVER
P — Powertrain
Evaporative leak detection system 1 failure
Views:
UK: 5
EN: 12
RU: 11
AI status
Completed
Completed
100%
Causes
- Short to ground on the 5V reference wiring
- Open or high-resistance connection in the 5V reference feed
- Corroded, damaged or loose sensor connector(s)
- Failed or internally shorted PCM/ECM 5V reference output
- Blown or bad fuse/fusible link supplying the PCM
- Low battery or poor charging system/engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Multiple sensor-related error codes or erratic sensor values
- Poor idle, hesitation, stalling or limp performance
- Hard starting or no-start condition in severe cases
- Reduced engine performance or fuel economy
- Intermittent faults that may change with movement of harness/connectors
What to check
- Retrieve freeze frame and all stored codes; note which sensors are involved
- Check battery voltage and charging system; repair low battery/charging faults first
- Inspect fuses and fusible links related to PCM power and reference circuits
- Visually inspect wiring harness and sensor connectors for damage, corrosion, pin push-out, or signs of arcing
- Backprobe 5V reference at PCM and at affected sensor connectors with key ON (engine OFF) and compare voltages
- Disconnect suspect sensors (one at a time) to see if 5V reference returns to normal (isolates shorted sensor)
Signal parameters
- Expected 5V reference (key ON, engine OFF): ~4.8–5.2 V (manufacturer tolerance may vary)
- Voltage should be stable (no significant ripple or drop) with key ON
- If a short exists, voltage may fall drastically toward 0V or fluctuate
- Under engine running conditions the reference should remain within tolerance; heavy loads or shorts will reduce voltage
Diagnostic algorithm
- Verify code P1496 and note freeze-frame/related codes. Clear codes and perform initial road/idle test to re-check.
- Check battery voltage and charging system. Repair charging/battery faults before proceeding.
- Check fuses/power to PCM and related fusible links. Replace any blown fuses and retest.
- Inspect wiring harness and connectors for damage at common sensor clusters and near routing points. Repair visible damage.
- With key ON (engine OFF), backprobe PCM 5V reference pin and measure voltage. Confirm expected ~5V.
- Measure 5V at each sensor connector that uses the reference. If one sensor shows low, disconnect that sensor and re-measure the reference at PCM.
- If disconnecting a sensor restores 5V, inspect/replace that sensor or its wiring (shorting component).
- If 5V is low at the PCM pin with all sensors disconnected, perform continuity/resistance tests from the PCM reference output to ground to check for internal short; consult wiring diagrams for correct pin locations.
- Repair any wiring harness faults, damaged connectors, or shorted sensors. After repairs clear codes and verify stable 5V and normal sensor readings.
- Replace PCM only if all wiring and sensor checks confirm the reference output is defective and manufacturer diagnostics indicate PCM failure.
Likely causes
- Short to ground on the 5V reference circuit (most likely)
- Damaged connector or wiring at a sensor cluster
- Blown/failed fuse or poor power/ground to the PCM
- Faulty PCM regulator/5V reference output (least likely; replace only after eliminating wiring faults)
Fault status
Status
PCM detected the 5-volt reference output below the expected threshold. This can affect multiple sensors that rely on the 5V reference. Investigate wiring, connectors, fuses, sensors and PCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1496
MITSUBISHI
P — Powertrain
5 Volt Supply Output Too Low
Views:
UK: 22
EN: 34
RU: 35
AI status
Completed
Completed
100%
Causes
- Short to ground on the 5V reference wiring
- Open or high-resistance connection in the 5V reference feed
- Corroded, damaged or loose sensor connector(s)
- Failed or internally shorted PCM/ECM 5V reference output
- Blown or bad fuse/fusible link supplying the PCM
- Low battery or poor charging system/engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Multiple sensor-related error codes or erratic sensor values
- Poor idle, hesitation, stalling or limp performance
- Hard starting or no-start condition in severe cases
- Reduced engine performance or fuel economy
- Intermittent faults that may change with movement of harness/connectors
What to check
- Retrieve freeze frame and all stored codes; note which sensors are involved
- Check battery voltage and charging system; repair low battery/charging faults first
- Inspect fuses and fusible links related to PCM power and reference circuits
- Visually inspect wiring harness and sensor connectors for damage, corrosion, pin push-out, or signs of arcing
- Backprobe 5V reference at PCM and at affected sensor connectors with key ON (engine OFF) and compare voltages
- Disconnect suspect sensors (one at a time) to see if 5V reference returns to normal (isolates shorted sensor)
Signal parameters
- Expected 5V reference (key ON, engine OFF): ~4.8–5.2 V (manufacturer tolerance may vary)
- Voltage should be stable (no significant ripple or drop) with key ON
- If a short exists, voltage may fall drastically toward 0V or fluctuate
- Under engine running conditions the reference should remain within tolerance; heavy loads or shorts will reduce voltage
Diagnostic algorithm
- Verify code P1496 and note freeze-frame/related codes. Clear codes and perform initial road/idle test to re-check.
- Check battery voltage and charging system. Repair charging/battery faults before proceeding.
- Check fuses/power to PCM and related fusible links. Replace any blown fuses and retest.
- Inspect wiring harness and connectors for damage at common sensor clusters and near routing points. Repair visible damage.
- With key ON (engine OFF), backprobe PCM 5V reference pin and measure voltage. Confirm expected ~5V.
- Measure 5V at each sensor connector that uses the reference. If one sensor shows low, disconnect that sensor and re-measure the reference at PCM.
- If disconnecting a sensor restores 5V, inspect/replace that sensor or its wiring (shorting component).
- If 5V is low at the PCM pin with all sensors disconnected, perform continuity/resistance tests from the PCM reference output to ground to check for internal short; consult wiring diagrams for correct pin locations.
- Repair any wiring harness faults, damaged connectors, or shorted sensors. After repairs clear codes and verify stable 5V and normal sensor readings.
- Replace PCM only if all wiring and sensor checks confirm the reference output is defective and manufacturer diagnostics indicate PCM failure.
Likely causes
- Short to ground on the 5V reference circuit (most likely)
- Damaged connector or wiring at a sensor cluster
- Blown/failed fuse or poor power/ground to the PCM
- Faulty PCM regulator/5V reference output (least likely; replace only after eliminating wiring faults)
Fault status
Status
PCM detected the 5-volt reference output below the expected threshold. This can affect multiple sensors that rely on the 5V reference. Investigate wiring, connectors, fuses, sensors and PCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1496
PLYMOUTH
P — Powertrain
5 Volt Supply Output Too Low
Views:
UK: 25
EN: 30
RU: 37
AI status
Completed
Completed
100%
Causes
- Short to ground on the 5V reference wiring
- Open or high-resistance connection in the 5V reference feed
- Corroded, damaged or loose sensor connector(s)
- Failed or internally shorted PCM/ECM 5V reference output
- Blown or bad fuse/fusible link supplying the PCM
- Low battery or poor charging system/engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Multiple sensor-related error codes or erratic sensor values
- Poor idle, hesitation, stalling or limp performance
- Hard starting or no-start condition in severe cases
- Reduced engine performance or fuel economy
- Intermittent faults that may change with movement of harness/connectors
What to check
- Retrieve freeze frame and all stored codes; note which sensors are involved
- Check battery voltage and charging system; repair low battery/charging faults first
- Inspect fuses and fusible links related to PCM power and reference circuits
- Visually inspect wiring harness and sensor connectors for damage, corrosion, pin push-out, or signs of arcing
- Backprobe 5V reference at PCM and at affected sensor connectors with key ON (engine OFF) and compare voltages
- Disconnect suspect sensors (one at a time) to see if 5V reference returns to normal (isolates shorted sensor)
Signal parameters
- Expected 5V reference (key ON, engine OFF): ~4.8–5.2 V (manufacturer tolerance may vary)
- Voltage should be stable (no significant ripple or drop) with key ON
- If a short exists, voltage may fall drastically toward 0V or fluctuate
- Under engine running conditions the reference should remain within tolerance; heavy loads or shorts will reduce voltage
Diagnostic algorithm
- Verify code P1496 and note freeze-frame/related codes. Clear codes and perform initial road/idle test to re-check.
- Check battery voltage and charging system. Repair charging/battery faults before proceeding.
- Check fuses/power to PCM and related fusible links. Replace any blown fuses and retest.
- Inspect wiring harness and connectors for damage at common sensor clusters and near routing points. Repair visible damage.
- With key ON (engine OFF), backprobe PCM 5V reference pin and measure voltage. Confirm expected ~5V.
- Measure 5V at each sensor connector that uses the reference. If one sensor shows low, disconnect that sensor and re-measure the reference at PCM.
- If disconnecting a sensor restores 5V, inspect/replace that sensor or its wiring (shorting component).
- If 5V is low at the PCM pin with all sensors disconnected, perform continuity/resistance tests from the PCM reference output to ground to check for internal short; consult wiring diagrams for correct pin locations.
- Repair any wiring harness faults, damaged connectors, or shorted sensors. After repairs clear codes and verify stable 5V and normal sensor readings.
- Replace PCM only if all wiring and sensor checks confirm the reference output is defective and manufacturer diagnostics indicate PCM failure.
Likely causes
- Short to ground on the 5V reference circuit (most likely)
- Damaged connector or wiring at a sensor cluster
- Blown/failed fuse or poor power/ground to the PCM
- Faulty PCM regulator/5V reference output (least likely; replace only after eliminating wiring faults)
Fault status
Status
PCM detected the 5-volt reference output below the expected threshold. This can affect multiple sensors that rely on the 5V reference. Investigate wiring, connectors, fuses, sensors and PCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1496
PONTIAC
P — Powertrain
5 Volt Supply Output Too Low
Views:
UK: 25
EN: 28
RU: 33
AI status
Completed
Completed
100%
Causes
- Short to ground on the 5V reference wiring
- Open or high-resistance connection in the 5V reference feed
- Corroded, damaged or loose sensor connector(s)
- Failed or internally shorted PCM/ECM 5V reference output
- Blown or bad fuse/fusible link supplying the PCM
- Low battery or poor charging system/engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Multiple sensor-related error codes or erratic sensor values
- Poor idle, hesitation, stalling or limp performance
- Hard starting or no-start condition in severe cases
- Reduced engine performance or fuel economy
- Intermittent faults that may change with movement of harness/connectors
What to check
- Retrieve freeze frame and all stored codes; note which sensors are involved
- Check battery voltage and charging system; repair low battery/charging faults first
- Inspect fuses and fusible links related to PCM power and reference circuits
- Visually inspect wiring harness and sensor connectors for damage, corrosion, pin push-out, or signs of arcing
- Backprobe 5V reference at PCM and at affected sensor connectors with key ON (engine OFF) and compare voltages
- Disconnect suspect sensors (one at a time) to see if 5V reference returns to normal (isolates shorted sensor)
Signal parameters
- Expected 5V reference (key ON, engine OFF): ~4.8–5.2 V (manufacturer tolerance may vary)
- Voltage should be stable (no significant ripple or drop) with key ON
- If a short exists, voltage may fall drastically toward 0V or fluctuate
- Under engine running conditions the reference should remain within tolerance; heavy loads or shorts will reduce voltage
Diagnostic algorithm
- Verify code P1496 and note freeze-frame/related codes. Clear codes and perform initial road/idle test to re-check.
- Check battery voltage and charging system. Repair charging/battery faults before proceeding.
- Check fuses/power to PCM and related fusible links. Replace any blown fuses and retest.
- Inspect wiring harness and connectors for damage at common sensor clusters and near routing points. Repair visible damage.
- With key ON (engine OFF), backprobe PCM 5V reference pin and measure voltage. Confirm expected ~5V.
- Measure 5V at each sensor connector that uses the reference. If one sensor shows low, disconnect that sensor and re-measure the reference at PCM.
- If disconnecting a sensor restores 5V, inspect/replace that sensor or its wiring (shorting component).
- If 5V is low at the PCM pin with all sensors disconnected, perform continuity/resistance tests from the PCM reference output to ground to check for internal short; consult wiring diagrams for correct pin locations.
- Repair any wiring harness faults, damaged connectors, or shorted sensors. After repairs clear codes and verify stable 5V and normal sensor readings.
- Replace PCM only if all wiring and sensor checks confirm the reference output is defective and manufacturer diagnostics indicate PCM failure.
Likely causes
- Short to ground on the 5V reference circuit (most likely)
- Damaged connector or wiring at a sensor cluster
- Blown/failed fuse or poor power/ground to the PCM
- Faulty PCM regulator/5V reference output (least likely; replace only after eliminating wiring faults)
Fault status
Status
PCM detected the 5-volt reference output below the expected threshold. This can affect multiple sensors that rely on the 5V reference. Investigate wiring, connectors, fuses, sensors and PCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1496
RAM
P — Powertrain
5 volt supply, output too low
Views:
UK: 2
EN: 4
RU: 1
AI status
Completed
Completed
100%
Causes
- Short to ground on the 5V reference wiring
- Open or high-resistance connection in the 5V reference feed
- Corroded, damaged or loose sensor connector(s)
- Failed or internally shorted PCM/ECM 5V reference output
- Blown or bad fuse/fusible link supplying the PCM
- Low battery or poor charging system/engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Multiple sensor-related error codes or erratic sensor values
- Poor idle, hesitation, stalling or limp performance
- Hard starting or no-start condition in severe cases
- Reduced engine performance or fuel economy
- Intermittent faults that may change with movement of harness/connectors
What to check
- Retrieve freeze frame and all stored codes; note which sensors are involved
- Check battery voltage and charging system; repair low battery/charging faults first
- Inspect fuses and fusible links related to PCM power and reference circuits
- Visually inspect wiring harness and sensor connectors for damage, corrosion, pin push-out, or signs of arcing
- Backprobe 5V reference at PCM and at affected sensor connectors with key ON (engine OFF) and compare voltages
- Disconnect suspect sensors (one at a time) to see if 5V reference returns to normal (isolates shorted sensor)
Signal parameters
- Expected 5V reference (key ON, engine OFF): ~4.8–5.2 V (manufacturer tolerance may vary)
- Voltage should be stable (no significant ripple or drop) with key ON
- If a short exists, voltage may fall drastically toward 0V or fluctuate
- Under engine running conditions the reference should remain within tolerance; heavy loads or shorts will reduce voltage
Diagnostic algorithm
- Verify code P1496 and note freeze-frame/related codes. Clear codes and perform initial road/idle test to re-check.
- Check battery voltage and charging system. Repair charging/battery faults before proceeding.
- Check fuses/power to PCM and related fusible links. Replace any blown fuses and retest.
- Inspect wiring harness and connectors for damage at common sensor clusters and near routing points. Repair visible damage.
- With key ON (engine OFF), backprobe PCM 5V reference pin and measure voltage. Confirm expected ~5V.
- Measure 5V at each sensor connector that uses the reference. If one sensor shows low, disconnect that sensor and re-measure the reference at PCM.
- If disconnecting a sensor restores 5V, inspect/replace that sensor or its wiring (shorting component).
- If 5V is low at the PCM pin with all sensors disconnected, perform continuity/resistance tests from the PCM reference output to ground to check for internal short; consult wiring diagrams for correct pin locations.
- Repair any wiring harness faults, damaged connectors, or shorted sensors. After repairs clear codes and verify stable 5V and normal sensor readings.
- Replace PCM only if all wiring and sensor checks confirm the reference output is defective and manufacturer diagnostics indicate PCM failure.
Likely causes
- Short to ground on the 5V reference circuit (most likely)
- Damaged connector or wiring at a sensor cluster
- Blown/failed fuse or poor power/ground to the PCM
- Faulty PCM regulator/5V reference output (least likely; replace only after eliminating wiring faults)
Fault status
Status
PCM detected the 5-volt reference output below the expected threshold. This can affect multiple sensors that rely on the 5V reference. Investigate wiring, connectors, fuses, sensors and PCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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