Code
P0472
Generic
P — Powertrain
Exhaust Pressure Sensor A Circuit Low
Views:
UK: 24
EN: 79
RU: 55
AI status
Completed
Completed
100%
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
- Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
- Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
- 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.
- 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).
- Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
- 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.
- If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
- 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.
- 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
Views:
UK: 6
EN: 20
RU: 15
AI status
Completed
Completed
100%
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
- Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
- Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
- 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.
- 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).
- Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
- 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.
- If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
- 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.
- 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
HUMMER
P — Powertrain
Exhaust Pressure Sensor Low
Views:
UK: 8
EN: 35
RU: 31
AI status
Completed
Completed
100%
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
- Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
- Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
- 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.
- 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).
- Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
- 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.
- If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
- 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.
- 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
MERCEDES-BENZ
P — Powertrain
Exhaust Pressure Sensor Low
Views:
UK: 14
EN: 41
RU: 44
AI status
Completed
Completed
100%
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
- Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
- Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
- 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.
- 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).
- Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
- 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.
- If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
- 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.
- 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
MITSUBISHI
P — Powertrain
Exhaust -Åpressure sensor low
Views:
UK: 7
EN: 30
RU: 33
AI status
Completed
Completed
100%
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
- Retrieve freeze frame and all related codes with a scan tool. Note live exhaust pressure sensor voltage and conditions when the code set.
- Perform a visual inspection of the sensor, connector and harness for damage, pin corrosion, soot or loose terminals.
- 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.
- 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).
- Wiggle the wiring and connectors while monitoring live data to detect intermittent shorts or opens.
- 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.
- If wiring and connectors check good, replace the exhaust pressure sensor and retest. Use OEM-equivalent sensor when possible.
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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0
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