Code
P0473
Generic
P — Powertrain
Exhaust Pressure Sensor A Circuit High
Views:
UK: 21
EN: 57
RU: 30
AI status
Completed
Completed
100%
Causes
- Damaged or failed exhaust pressure sensor (internal short or open)
- Short to battery voltage or VREF in sensor signal wire
- Poor or open ground for the sensor
- Corroded, loose or damaged connector/pins
- Damaged wiring harness (chafing, pinched, broken strands)
- ECM input fault (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) or check engine light illuminated
- Reduced engine performance or limp mode (on some vehicles)
- Inhibited or abnormal DPF regeneration behavior
- Poor fuel economy
- Stored fault code(s) and freeze-frame data showing high sensor voltage/pressure
What to check
- Read active and stored codes and freeze-frame data with a scan tool
- Inspect sensor connector and wiring for damage, corrosion, loose pins or water ingress
- Backprobe sensor signal, VREF and ground with a multimeter/scan tool to observe live data
- Measure signal voltage with key ON/engine OFF and during engine operation
- Check continuity and resistance of signal and ground circuits to the ECM
- Wiggle harness/connectors while monitoring live data to reproduce fault
Signal parameters
- Sensor reference (VREF): typically ~5.0 V (varies by manufacturer)
- Expected sensor signal range: typically ~0.5 V to ~4.5 V across operating pressure range (check vehicle spec)
- Circuit High indication: signal voltage above specified upper limit (often >4.5–4.8 V)
- Observe corresponding calculated pressure in kPa/psi from scan tool — should be plausible vs. engine load/idle
Diagnostic algorithm
- Verify the code is current. Retrieve freeze-frame and live data to see reported signal voltage/pressure and conditions when fault set.
- Visual inspection: examine sensor, connector, and harness for damage, corrosion, crushed wires or signs of exhaust leaks/soot ingress.
- With key ON (engine OFF), backprobe sensor connector: verify VREF present (approx. 5 V) and good ground continuity to chassis/ECM.
- Measure sensor signal voltage at connector with key ON and with engine running. If signal is high (> specified upper limit), suspect short to power or faulty sensor.
- Disconnect the sensor and measure signal pin for voltage. If high with sensor disconnected, wiring is shorted to voltage — trace and repair harness.
- If signal drops to expected levels when sensor disconnected, the sensor is likely faulty — replace the sensor and retest.
- Check wiring continuity from sensor connector to ECM pin; repair any open or shorted circuits. Repair/replace damaged connector or harness.
- If wiring and sensor test good, test ECM input for shorts or improper reference voltage. Consider ECM testing or replacement only after eliminating harness/sensor causes.
- If electrical circuit is confirmed good but pressure readings remain unusually high, measure exhaust backpressure mechanically to check for DPF/exhaust restriction and correct as needed.
- After repairs, clear the code and perform a test drive and live-data monitoring to confirm the fault does not return.
Likely causes
- Sensor wiring shorted to 5V/key-on feed or battery positive
- Faulty sensor producing high output voltage
- Corroded connector causing intermittent high reading
- Poor ground at sensor or ECM pin
- Severe exhaust restriction causing legitimately high pressure (verify after electrical checks)
Fault status
Status
Exhaust Pressure Sensor A Circuit High — sensor signal voltage above allowable range. Possible short to power, sensor or connector failure, poor ground, wiring damage, or actual excessive exhaust backpressure.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0473
GWM
P — Powertrain
- High Exhaust Pressure Sensor
Views:
UK: 9
EN: 20
RU: 13
AI status
Completed
Completed
100%
Causes
- Damaged or failed exhaust pressure sensor (internal short or open)
- Short to battery voltage or VREF in sensor signal wire
- Poor or open ground for the sensor
- Corroded, loose or damaged connector/pins
- Damaged wiring harness (chafing, pinched, broken strands)
- ECM input fault (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) or check engine light illuminated
- Reduced engine performance or limp mode (on some vehicles)
- Inhibited or abnormal DPF regeneration behavior
- Poor fuel economy
- Stored fault code(s) and freeze-frame data showing high sensor voltage/pressure
What to check
- Read active and stored codes and freeze-frame data with a scan tool
- Inspect sensor connector and wiring for damage, corrosion, loose pins or water ingress
- Backprobe sensor signal, VREF and ground with a multimeter/scan tool to observe live data
- Measure signal voltage with key ON/engine OFF and during engine operation
- Check continuity and resistance of signal and ground circuits to the ECM
- Wiggle harness/connectors while monitoring live data to reproduce fault
Signal parameters
- Sensor reference (VREF): typically ~5.0 V (varies by manufacturer)
- Expected sensor signal range: typically ~0.5 V to ~4.5 V across operating pressure range (check vehicle spec)
- Circuit High indication: signal voltage above specified upper limit (often >4.5–4.8 V)
- Observe corresponding calculated pressure in kPa/psi from scan tool — should be plausible vs. engine load/idle
Diagnostic algorithm
- Verify the code is current. Retrieve freeze-frame and live data to see reported signal voltage/pressure and conditions when fault set.
- Visual inspection: examine sensor, connector, and harness for damage, corrosion, crushed wires or signs of exhaust leaks/soot ingress.
- With key ON (engine OFF), backprobe sensor connector: verify VREF present (approx. 5 V) and good ground continuity to chassis/ECM.
- Measure sensor signal voltage at connector with key ON and with engine running. If signal is high (> specified upper limit), suspect short to power or faulty sensor.
- Disconnect the sensor and measure signal pin for voltage. If high with sensor disconnected, wiring is shorted to voltage — trace and repair harness.
- If signal drops to expected levels when sensor disconnected, the sensor is likely faulty — replace the sensor and retest.
- Check wiring continuity from sensor connector to ECM pin; repair any open or shorted circuits. Repair/replace damaged connector or harness.
- If wiring and sensor test good, test ECM input for shorts or improper reference voltage. Consider ECM testing or replacement only after eliminating harness/sensor causes.
- If electrical circuit is confirmed good but pressure readings remain unusually high, measure exhaust backpressure mechanically to check for DPF/exhaust restriction and correct as needed.
- After repairs, clear the code and perform a test drive and live-data monitoring to confirm the fault does not return.
Likely causes
- Sensor wiring shorted to 5V/key-on feed or battery positive
- Faulty sensor producing high output voltage
- Corroded connector causing intermittent high reading
- Poor ground at sensor or ECM pin
- Severe exhaust restriction causing legitimately high pressure (verify after electrical checks)
Fault status
Status
Exhaust Pressure Sensor A Circuit High — sensor signal voltage above allowable range. Possible short to power, sensor or connector failure, poor ground, wiring damage, or actual excessive exhaust backpressure.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0473
HUMMER
P — Powertrain
Exhaust Pressure Sensor High
Views:
UK: 15
EN: 28
RU: 22
AI status
Completed
Completed
100%
Causes
- Damaged or failed exhaust pressure sensor (internal short or open)
- Short to battery voltage or VREF in sensor signal wire
- Poor or open ground for the sensor
- Corroded, loose or damaged connector/pins
- Damaged wiring harness (chafing, pinched, broken strands)
- ECM input fault (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) or check engine light illuminated
- Reduced engine performance or limp mode (on some vehicles)
- Inhibited or abnormal DPF regeneration behavior
- Poor fuel economy
- Stored fault code(s) and freeze-frame data showing high sensor voltage/pressure
What to check
- Read active and stored codes and freeze-frame data with a scan tool
- Inspect sensor connector and wiring for damage, corrosion, loose pins or water ingress
- Backprobe sensor signal, VREF and ground with a multimeter/scan tool to observe live data
- Measure signal voltage with key ON/engine OFF and during engine operation
- Check continuity and resistance of signal and ground circuits to the ECM
- Wiggle harness/connectors while monitoring live data to reproduce fault
Signal parameters
- Sensor reference (VREF): typically ~5.0 V (varies by manufacturer)
- Expected sensor signal range: typically ~0.5 V to ~4.5 V across operating pressure range (check vehicle spec)
- Circuit High indication: signal voltage above specified upper limit (often >4.5–4.8 V)
- Observe corresponding calculated pressure in kPa/psi from scan tool — should be plausible vs. engine load/idle
Diagnostic algorithm
- Verify the code is current. Retrieve freeze-frame and live data to see reported signal voltage/pressure and conditions when fault set.
- Visual inspection: examine sensor, connector, and harness for damage, corrosion, crushed wires or signs of exhaust leaks/soot ingress.
- With key ON (engine OFF), backprobe sensor connector: verify VREF present (approx. 5 V) and good ground continuity to chassis/ECM.
- Measure sensor signal voltage at connector with key ON and with engine running. If signal is high (> specified upper limit), suspect short to power or faulty sensor.
- Disconnect the sensor and measure signal pin for voltage. If high with sensor disconnected, wiring is shorted to voltage — trace and repair harness.
- If signal drops to expected levels when sensor disconnected, the sensor is likely faulty — replace the sensor and retest.
- Check wiring continuity from sensor connector to ECM pin; repair any open or shorted circuits. Repair/replace damaged connector or harness.
- If wiring and sensor test good, test ECM input for shorts or improper reference voltage. Consider ECM testing or replacement only after eliminating harness/sensor causes.
- If electrical circuit is confirmed good but pressure readings remain unusually high, measure exhaust backpressure mechanically to check for DPF/exhaust restriction and correct as needed.
- After repairs, clear the code and perform a test drive and live-data monitoring to confirm the fault does not return.
Likely causes
- Sensor wiring shorted to 5V/key-on feed or battery positive
- Faulty sensor producing high output voltage
- Corroded connector causing intermittent high reading
- Poor ground at sensor or ECM pin
- Severe exhaust restriction causing legitimately high pressure (verify after electrical checks)
Fault status
Status
Exhaust Pressure Sensor A Circuit High — sensor signal voltage above allowable range. Possible short to power, sensor or connector failure, poor ground, wiring damage, or actual excessive exhaust backpressure.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0473
MERCEDES-BENZ
P — Powertrain
Exhaust Pressure Sensor High
Views:
UK: 17
EN: 28
RU: 24
AI status
Completed
Completed
100%
Causes
- Damaged or failed exhaust pressure sensor (internal short or open)
- Short to battery voltage or VREF in sensor signal wire
- Poor or open ground for the sensor
- Corroded, loose or damaged connector/pins
- Damaged wiring harness (chafing, pinched, broken strands)
- ECM input fault (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) or check engine light illuminated
- Reduced engine performance or limp mode (on some vehicles)
- Inhibited or abnormal DPF regeneration behavior
- Poor fuel economy
- Stored fault code(s) and freeze-frame data showing high sensor voltage/pressure
What to check
- Read active and stored codes and freeze-frame data with a scan tool
- Inspect sensor connector and wiring for damage, corrosion, loose pins or water ingress
- Backprobe sensor signal, VREF and ground with a multimeter/scan tool to observe live data
- Measure signal voltage with key ON/engine OFF and during engine operation
- Check continuity and resistance of signal and ground circuits to the ECM
- Wiggle harness/connectors while monitoring live data to reproduce fault
Signal parameters
- Sensor reference (VREF): typically ~5.0 V (varies by manufacturer)
- Expected sensor signal range: typically ~0.5 V to ~4.5 V across operating pressure range (check vehicle spec)
- Circuit High indication: signal voltage above specified upper limit (often >4.5–4.8 V)
- Observe corresponding calculated pressure in kPa/psi from scan tool — should be plausible vs. engine load/idle
Diagnostic algorithm
- Verify the code is current. Retrieve freeze-frame and live data to see reported signal voltage/pressure and conditions when fault set.
- Visual inspection: examine sensor, connector, and harness for damage, corrosion, crushed wires or signs of exhaust leaks/soot ingress.
- With key ON (engine OFF), backprobe sensor connector: verify VREF present (approx. 5 V) and good ground continuity to chassis/ECM.
- Measure sensor signal voltage at connector with key ON and with engine running. If signal is high (> specified upper limit), suspect short to power or faulty sensor.
- Disconnect the sensor and measure signal pin for voltage. If high with sensor disconnected, wiring is shorted to voltage — trace and repair harness.
- If signal drops to expected levels when sensor disconnected, the sensor is likely faulty — replace the sensor and retest.
- Check wiring continuity from sensor connector to ECM pin; repair any open or shorted circuits. Repair/replace damaged connector or harness.
- If wiring and sensor test good, test ECM input for shorts or improper reference voltage. Consider ECM testing or replacement only after eliminating harness/sensor causes.
- If electrical circuit is confirmed good but pressure readings remain unusually high, measure exhaust backpressure mechanically to check for DPF/exhaust restriction and correct as needed.
- After repairs, clear the code and perform a test drive and live-data monitoring to confirm the fault does not return.
Likely causes
- Sensor wiring shorted to 5V/key-on feed or battery positive
- Faulty sensor producing high output voltage
- Corroded connector causing intermittent high reading
- Poor ground at sensor or ECM pin
- Severe exhaust restriction causing legitimately high pressure (verify after electrical checks)
Fault status
Status
Exhaust Pressure Sensor A Circuit High — sensor signal voltage above allowable range. Possible short to power, sensor or connector failure, poor ground, wiring damage, or actual excessive exhaust backpressure.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0473
MITSUBISHI
P — Powertrain
Exhaust -Åpressure sensor high
Views:
UK: 10
EN: 22
RU: 18
AI status
Completed
Completed
100%
Causes
- Damaged or failed exhaust pressure sensor (internal short or open)
- Short to battery voltage or VREF in sensor signal wire
- Poor or open ground for the sensor
- Corroded, loose or damaged connector/pins
- Damaged wiring harness (chafing, pinched, broken strands)
- ECM input fault (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) or check engine light illuminated
- Reduced engine performance or limp mode (on some vehicles)
- Inhibited or abnormal DPF regeneration behavior
- Poor fuel economy
- Stored fault code(s) and freeze-frame data showing high sensor voltage/pressure
What to check
- Read active and stored codes and freeze-frame data with a scan tool
- Inspect sensor connector and wiring for damage, corrosion, loose pins or water ingress
- Backprobe sensor signal, VREF and ground with a multimeter/scan tool to observe live data
- Measure signal voltage with key ON/engine OFF and during engine operation
- Check continuity and resistance of signal and ground circuits to the ECM
- Wiggle harness/connectors while monitoring live data to reproduce fault
Signal parameters
- Sensor reference (VREF): typically ~5.0 V (varies by manufacturer)
- Expected sensor signal range: typically ~0.5 V to ~4.5 V across operating pressure range (check vehicle spec)
- Circuit High indication: signal voltage above specified upper limit (often >4.5–4.8 V)
- Observe corresponding calculated pressure in kPa/psi from scan tool — should be plausible vs. engine load/idle
Diagnostic algorithm
- Verify the code is current. Retrieve freeze-frame and live data to see reported signal voltage/pressure and conditions when fault set.
- Visual inspection: examine sensor, connector, and harness for damage, corrosion, crushed wires or signs of exhaust leaks/soot ingress.
- With key ON (engine OFF), backprobe sensor connector: verify VREF present (approx. 5 V) and good ground continuity to chassis/ECM.
- Measure sensor signal voltage at connector with key ON and with engine running. If signal is high (> specified upper limit), suspect short to power or faulty sensor.
- Disconnect the sensor and measure signal pin for voltage. If high with sensor disconnected, wiring is shorted to voltage — trace and repair harness.
- If signal drops to expected levels when sensor disconnected, the sensor is likely faulty — replace the sensor and retest.
- Check wiring continuity from sensor connector to ECM pin; repair any open or shorted circuits. Repair/replace damaged connector or harness.
- If wiring and sensor test good, test ECM input for shorts or improper reference voltage. Consider ECM testing or replacement only after eliminating harness/sensor causes.
- If electrical circuit is confirmed good but pressure readings remain unusually high, measure exhaust backpressure mechanically to check for DPF/exhaust restriction and correct as needed.
- After repairs, clear the code and perform a test drive and live-data monitoring to confirm the fault does not return.
Likely causes
- Sensor wiring shorted to 5V/key-on feed or battery positive
- Faulty sensor producing high output voltage
- Corroded connector causing intermittent high reading
- Poor ground at sensor or ECM pin
- Severe exhaust restriction causing legitimately high pressure (verify after electrical checks)
Fault status
Status
Exhaust Pressure Sensor A Circuit High — sensor signal voltage above allowable range. Possible short to power, sensor or connector failure, poor ground, wiring damage, or actual excessive exhaust backpressure.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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0
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