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Home / DTC / P0472 — Exhaust Pressure Sensor A Circuit Low

P0472 — Exhaust Pressure Sensor A Circuit Low

Detailed page for trouble code P0472.

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22,491specific
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Code

P0472

Generic P — Powertrain

Exhaust Pressure Sensor A Circuit Low

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on the exhaust pressure sensor signal wire
  • Open or corroded connector or poor pin contact at the sensor
  • Failed exhaust pressure sensor (internal fault)
  • Loss of sensor reference or ground (ECM or vehicle wiring issue)
  • Exhaust system leak or blockage producing unexpected measurements (less common)
  • Faulty ECM input circuit (rare)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Stored P0472 (and possibly related) DTC(s)
  • Possible reduced engine performance or limp mode on some vehicles
  • DPF regeneration issues, EGR control or turbo-related warnings (diesel applications)
  • Poor fuel economy or rough running in some cases

What to check

  • Scan tool: read and record stored codes, freeze frame and live exhaust pressure sensor data
  • Visual inspection of sensor, connector, and wiring for damage, corrosion, or contamination
  • Backprobe sensor connector with key ON to measure signal voltage and reference voltage
  • Check continuity and resistance of sensor signal, power and ground circuits to the ECM
  • Perform wiggle test on wiring while monitoring live data to find intermittent faults
  • Inspect exhaust system for leaks, restrictions or damaged components that could affect pressure readings

Signal parameters

  • Sensor output: typically a 0–5 V analog signal (varies by manufacturer)
  • Expected idle/normal range: often ~0.5–4.0 V depending on vehicle (refer to manufacturer specs)
  • Low-circuit indication: output voltage close to 0 V or below the manufacturer low threshold (commonly
  • Reference supply: usually 5 V from ECM; verify presence at sensor connector with key ON
  • Ground: proper sensor ground should show near 0 Ω continuity to chassis/ECM ground

Diagnostic algorithm

  1. Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
  2. Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
  3. With ignition ON (engine OFF), backprobe the sensor connector and verify: a) reference voltage (typically 5 V), b) sensor signal voltage, and c) ground continuity.
  4. If signal is low and reference/ground are present, check continuity of the signal wire from sensor to ECM and inspect for short to ground (measure resistance to ground).
  5. Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
  6. If available, apply a known pressure (hand pump or manufacturer test tool) while monitoring signal voltage to confirm sensor response. No response indicates a failed sensor or wiring issue.
  7. If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
  8. If problem persists after sensor replacement, inspect ECM connector/pins and measure the ECM input circuit; consider ECM fault if wiring and replacement sensor verified functional.
  9. After repairs, clear codes and perform a test drive or required functional tests to confirm the code does not return.

Likely causes

  • Damaged/frayed wiring harness to the sensor causing signal short to ground
  • Corroded or pushed-out terminal in the sensor connector
  • Failed sensor (electronics degraded, internal short)
  • Missing or low 5 V reference or bad ground at the sensor
  • Connector contaminated with soot or moisture affecting signal
  • ECM pin fault or internal short (after verifying wiring and sensor)

Fault status

⚠️ Status
Exhaust Pressure Sensor A Circuit Low — Check wiring, connector and sensor; possible short to ground or sensor failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P0472

GWM P — Powertrain

- Exhaust Gas Pressure Sensor Low

Brand: GWM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on the exhaust pressure sensor signal wire
  • Open or corroded connector or poor pin contact at the sensor
  • Failed exhaust pressure sensor (internal fault)
  • Loss of sensor reference or ground (ECM or vehicle wiring issue)
  • Exhaust system leak or blockage producing unexpected measurements (less common)
  • Faulty ECM input circuit (rare)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Stored P0472 (and possibly related) DTC(s)
  • Possible reduced engine performance or limp mode on some vehicles
  • DPF regeneration issues, EGR control or turbo-related warnings (diesel applications)
  • Poor fuel economy or rough running in some cases

What to check

  • Scan tool: read and record stored codes, freeze frame and live exhaust pressure sensor data
  • Visual inspection of sensor, connector, and wiring for damage, corrosion, or contamination
  • Backprobe sensor connector with key ON to measure signal voltage and reference voltage
  • Check continuity and resistance of sensor signal, power and ground circuits to the ECM
  • Perform wiggle test on wiring while monitoring live data to find intermittent faults
  • Inspect exhaust system for leaks, restrictions or damaged components that could affect pressure readings

Signal parameters

  • Sensor output: typically a 0–5 V analog signal (varies by manufacturer)
  • Expected idle/normal range: often ~0.5–4.0 V depending on vehicle (refer to manufacturer specs)
  • Low-circuit indication: output voltage close to 0 V or below the manufacturer low threshold (commonly
  • Reference supply: usually 5 V from ECM; verify presence at sensor connector with key ON
  • Ground: proper sensor ground should show near 0 Ω continuity to chassis/ECM ground

Diagnostic algorithm

  1. Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
  2. Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
  3. With ignition ON (engine OFF), backprobe the sensor connector and verify: a) reference voltage (typically 5 V), b) sensor signal voltage, and c) ground continuity.
  4. If signal is low and reference/ground are present, check continuity of the signal wire from sensor to ECM and inspect for short to ground (measure resistance to ground).
  5. Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
  6. If available, apply a known pressure (hand pump or manufacturer test tool) while monitoring signal voltage to confirm sensor response. No response indicates a failed sensor or wiring issue.
  7. If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
  8. If problem persists after sensor replacement, inspect ECM connector/pins and measure the ECM input circuit; consider ECM fault if wiring and replacement sensor verified functional.
  9. After repairs, clear codes and perform a test drive or required functional tests to confirm the code does not return.

Likely causes

  • Damaged/frayed wiring harness to the sensor causing signal short to ground
  • Corroded or pushed-out terminal in the sensor connector
  • Failed sensor (electronics degraded, internal short)
  • Missing or low 5 V reference or bad ground at the sensor
  • Connector contaminated with soot or moisture affecting signal
  • ECM pin fault or internal short (after verifying wiring and sensor)

Fault status

⚠️ Status
Exhaust Pressure Sensor A Circuit Low — Check wiring, connector and sensor; possible short to ground or sensor failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0471 P0473 P0401 P2002 P0106
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Code

P0472

HUMMER P — Powertrain

Exhaust Pressure Sensor Low

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on the exhaust pressure sensor signal wire
  • Open or corroded connector or poor pin contact at the sensor
  • Failed exhaust pressure sensor (internal fault)
  • Loss of sensor reference or ground (ECM or vehicle wiring issue)
  • Exhaust system leak or blockage producing unexpected measurements (less common)
  • Faulty ECM input circuit (rare)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Stored P0472 (and possibly related) DTC(s)
  • Possible reduced engine performance or limp mode on some vehicles
  • DPF regeneration issues, EGR control or turbo-related warnings (diesel applications)
  • Poor fuel economy or rough running in some cases

What to check

  • Scan tool: read and record stored codes, freeze frame and live exhaust pressure sensor data
  • Visual inspection of sensor, connector, and wiring for damage, corrosion, or contamination
  • Backprobe sensor connector with key ON to measure signal voltage and reference voltage
  • Check continuity and resistance of sensor signal, power and ground circuits to the ECM
  • Perform wiggle test on wiring while monitoring live data to find intermittent faults
  • Inspect exhaust system for leaks, restrictions or damaged components that could affect pressure readings

Signal parameters

  • Sensor output: typically a 0–5 V analog signal (varies by manufacturer)
  • Expected idle/normal range: often ~0.5–4.0 V depending on vehicle (refer to manufacturer specs)
  • Low-circuit indication: output voltage close to 0 V or below the manufacturer low threshold (commonly
  • Reference supply: usually 5 V from ECM; verify presence at sensor connector with key ON
  • Ground: proper sensor ground should show near 0 Ω continuity to chassis/ECM ground

Diagnostic algorithm

  1. Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
  2. Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
  3. With ignition ON (engine OFF), backprobe the sensor connector and verify: a) reference voltage (typically 5 V), b) sensor signal voltage, and c) ground continuity.
  4. If signal is low and reference/ground are present, check continuity of the signal wire from sensor to ECM and inspect for short to ground (measure resistance to ground).
  5. Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
  6. If available, apply a known pressure (hand pump or manufacturer test tool) while monitoring signal voltage to confirm sensor response. No response indicates a failed sensor or wiring issue.
  7. If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
  8. If problem persists after sensor replacement, inspect ECM connector/pins and measure the ECM input circuit; consider ECM fault if wiring and replacement sensor verified functional.
  9. After repairs, clear codes and perform a test drive or required functional tests to confirm the code does not return.

Likely causes

  • Damaged/frayed wiring harness to the sensor causing signal short to ground
  • Corroded or pushed-out terminal in the sensor connector
  • Failed sensor (electronics degraded, internal short)
  • Missing or low 5 V reference or bad ground at the sensor
  • Connector contaminated with soot or moisture affecting signal
  • ECM pin fault or internal short (after verifying wiring and sensor)

Fault status

⚠️ Status
Exhaust Pressure Sensor A Circuit Low — Check wiring, connector and sensor; possible short to ground or sensor failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0471 P0473 P0401 P2002 P0106
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

P0472

MERCEDES-BENZ P — Powertrain

Exhaust Pressure Sensor Low

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on the exhaust pressure sensor signal wire
  • Open or corroded connector or poor pin contact at the sensor
  • Failed exhaust pressure sensor (internal fault)
  • Loss of sensor reference or ground (ECM or vehicle wiring issue)
  • Exhaust system leak or blockage producing unexpected measurements (less common)
  • Faulty ECM input circuit (rare)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Stored P0472 (and possibly related) DTC(s)
  • Possible reduced engine performance or limp mode on some vehicles
  • DPF regeneration issues, EGR control or turbo-related warnings (diesel applications)
  • Poor fuel economy or rough running in some cases

What to check

  • Scan tool: read and record stored codes, freeze frame and live exhaust pressure sensor data
  • Visual inspection of sensor, connector, and wiring for damage, corrosion, or contamination
  • Backprobe sensor connector with key ON to measure signal voltage and reference voltage
  • Check continuity and resistance of sensor signal, power and ground circuits to the ECM
  • Perform wiggle test on wiring while monitoring live data to find intermittent faults
  • Inspect exhaust system for leaks, restrictions or damaged components that could affect pressure readings

Signal parameters

  • Sensor output: typically a 0–5 V analog signal (varies by manufacturer)
  • Expected idle/normal range: often ~0.5–4.0 V depending on vehicle (refer to manufacturer specs)
  • Low-circuit indication: output voltage close to 0 V or below the manufacturer low threshold (commonly
  • Reference supply: usually 5 V from ECM; verify presence at sensor connector with key ON
  • Ground: proper sensor ground should show near 0 Ω continuity to chassis/ECM ground

Diagnostic algorithm

  1. Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
  2. Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
  3. With ignition ON (engine OFF), backprobe the sensor connector and verify: a) reference voltage (typically 5 V), b) sensor signal voltage, and c) ground continuity.
  4. If signal is low and reference/ground are present, check continuity of the signal wire from sensor to ECM and inspect for short to ground (measure resistance to ground).
  5. Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
  6. If available, apply a known pressure (hand pump or manufacturer test tool) while monitoring signal voltage to confirm sensor response. No response indicates a failed sensor or wiring issue.
  7. If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
  8. If problem persists after sensor replacement, inspect ECM connector/pins and measure the ECM input circuit; consider ECM fault if wiring and replacement sensor verified functional.
  9. After repairs, clear codes and perform a test drive or required functional tests to confirm the code does not return.

Likely causes

  • Damaged/frayed wiring harness to the sensor causing signal short to ground
  • Corroded or pushed-out terminal in the sensor connector
  • Failed sensor (electronics degraded, internal short)
  • Missing or low 5 V reference or bad ground at the sensor
  • Connector contaminated with soot or moisture affecting signal
  • ECM pin fault or internal short (after verifying wiring and sensor)

Fault status

⚠️ Status
Exhaust Pressure Sensor A Circuit Low — Check wiring, connector and sensor; possible short to ground or sensor failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0471 P0473 P0401 P2002 P0106
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0472

MITSUBISHI P — Powertrain

Exhaust -Åpressure sensor low

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on the exhaust pressure sensor signal wire
  • Open or corroded connector or poor pin contact at the sensor
  • Failed exhaust pressure sensor (internal fault)
  • Loss of sensor reference or ground (ECM or vehicle wiring issue)
  • Exhaust system leak or blockage producing unexpected measurements (less common)
  • Faulty ECM input circuit (rare)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Stored P0472 (and possibly related) DTC(s)
  • Possible reduced engine performance or limp mode on some vehicles
  • DPF regeneration issues, EGR control or turbo-related warnings (diesel applications)
  • Poor fuel economy or rough running in some cases

What to check

  • Scan tool: read and record stored codes, freeze frame and live exhaust pressure sensor data
  • Visual inspection of sensor, connector, and wiring for damage, corrosion, or contamination
  • Backprobe sensor connector with key ON to measure signal voltage and reference voltage
  • Check continuity and resistance of sensor signal, power and ground circuits to the ECM
  • Perform wiggle test on wiring while monitoring live data to find intermittent faults
  • Inspect exhaust system for leaks, restrictions or damaged components that could affect pressure readings

Signal parameters

  • Sensor output: typically a 0–5 V analog signal (varies by manufacturer)
  • Expected idle/normal range: often ~0.5–4.0 V depending on vehicle (refer to manufacturer specs)
  • Low-circuit indication: output voltage close to 0 V or below the manufacturer low threshold (commonly
  • Reference supply: usually 5 V from ECM; verify presence at sensor connector with key ON
  • Ground: proper sensor ground should show near 0 Ω continuity to chassis/ECM ground

Diagnostic algorithm

  1. Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
  2. Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
  3. With ignition ON (engine OFF), backprobe the sensor connector and verify: a) reference voltage (typically 5 V), b) sensor signal voltage, and c) ground continuity.
  4. If signal is low and reference/ground are present, check continuity of the signal wire from sensor to ECM and inspect for short to ground (measure resistance to ground).
  5. Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
  6. If available, apply a known pressure (hand pump or manufacturer test tool) while monitoring signal voltage to confirm sensor response. No response indicates a failed sensor or wiring issue.
  7. If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
  8. If problem persists after sensor replacement, inspect ECM connector/pins and measure the ECM input circuit; consider ECM fault if wiring and replacement sensor verified functional.
  9. After repairs, clear codes and perform a test drive or required functional tests to confirm the code does not return.

Likely causes

  • Damaged/frayed wiring harness to the sensor causing signal short to ground
  • Corroded or pushed-out terminal in the sensor connector
  • Failed sensor (electronics degraded, internal short)
  • Missing or low 5 V reference or bad ground at the sensor
  • Connector contaminated with soot or moisture affecting signal
  • ECM pin fault or internal short (after verifying wiring and sensor)

Fault status

⚠️ Status
Exhaust Pressure Sensor A Circuit Low — Check wiring, connector and sensor; possible short to ground or sensor failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0471 P0473 P0401 P2002 P0106
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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