Code
P0470
Generic
P — Powertrain
Exhaust Pressure Sensor A Circuit
Views:
UK: 21
EN: 38
RU: 28
AI status
Completed
Completed
100%
Causes
- Damaged or corroded sensor connector or wiring (open, short to ground or battery, high resistance)
- Faulty exhaust pressure sensor (internal failure)
- Restricted or blocked sensor port/hoses or clogged sensor pickup
- Excessive heat or contamination damaging the sensor
- Poor ground or supply reference from ECM
- Faulty ECM or incorrect software/calibration
Symptoms
- Check Engine Light / MIL illuminated
- DPF regeneration issues (failed or inhibited regen)
- Reduced engine performance or limp mode on some vehicles
- Increased emissions or smoke during acceleration
- Stored fault codes related to EGR/aftertreatment or boost control in some systems
What to check
- Read freeze frame and freeze data with a scan tool; confirm P0470 is current and note conditions when set
- Scan for related codes (EGR, DPF differential pressure, boost pressure, wiring/CAN errors)
- Visually inspect sensor, connector, and wiring harness for damage, corrosion, or heat exposure
- Backprobe the sensor connector and measure reference, signal and ground with a multimeter or scope
- Check sensor port/hose for blockages, soot or mechanical restriction
- Wiggle wiring and connectors while monitoring live data to reproduce the fault
Signal parameters
- Sensor supply/reference: typically 5 V reference from ECM (verify vehicle-specific spec)
- Signal output (analog): typically 0.5–4.5 V across the sensor operating range (varies by manufacturer)
- Expected behavior: signal voltage should change smoothly with exhaust pressure/load; no signal or pegged voltage indicates fault
- Resistance or sensor-specific values: check OEM specification for exact sensor resistance or pressure-to-voltage mapping
Diagnostic algorithm
- Use an OBD-II scanner to confirm P0470, record freeze frame data and clear the code. If code returns, proceed.
- Perform a visual inspection of the exhaust pressure sensor, connector and wiring for damage, corrosion, melted insulation or soot in the port. Repair or replace obvious issues.
- With ignition ON (engine OFF), backprobe the sensor connector. Verify the reference voltage from the ECM (usually ~5 V) and a good ground. If reference or ground is missing, trace/repair wiring to ECM.
- Start the engine and monitor the sensor signal voltage with a multimeter or oscilloscope. Verify the voltage changes with engine speed/load. If signal is stuck high or low, test for short to battery or ground.
- If wiring and power/ground are good but signal is incorrect, disconnect the sensor and check for open circuit or incorrect resistance per manufacturer spec. Replace sensor if out of spec.
- Inspect and clear the sensor port/hose (remove soot/clogs). Reinstall and retest for proper signal behavior.
- If wiring, connector and sensor check good, inspect ECM grounds and fuses. Perform harness continuity checks between sensor and ECM for intermittent opens/shorts.
- If fault persists with correct wiring and a known-good sensor, consult vehicle-specific service information for ECM testing or software updates; consider ECM repair/reprogramming as last step.
- After repairs, clear codes and perform a road test and scan-tool verification of live data to ensure code does not return.
Likely causes
- Broken or chafed wiring between sensor and ECM
- Corroded/loose connector at the sensor
- Failed exhaust pressure sensor
- Blocked sensor port or clogged fitting preventing correct pressure reading
Fault status
Status
P0470 - Exhaust Pressure Sensor A Circuit. Indicates open, short, out-of-range or implausible signal from the exhaust pressure sensor circuit.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P0470
GWM
P — Powertrain
- Exhaust Gas Pressure Sensor Circuit Malfunction
Views:
UK: 6
EN: 17
RU: 10
AI status
Completed
Completed
100%
Causes
- Damaged or corroded sensor connector or wiring (open, short to ground or battery, high resistance)
- Faulty exhaust pressure sensor (internal failure)
- Restricted or blocked sensor port/hoses or clogged sensor pickup
- Excessive heat or contamination damaging the sensor
- Poor ground or supply reference from ECM
- Faulty ECM or incorrect software/calibration
Symptoms
- Check Engine Light / MIL illuminated
- DPF regeneration issues (failed or inhibited regen)
- Reduced engine performance or limp mode on some vehicles
- Increased emissions or smoke during acceleration
- Stored fault codes related to EGR/aftertreatment or boost control in some systems
What to check
- Read freeze frame and freeze data with a scan tool; confirm P0470 is current and note conditions when set
- Scan for related codes (EGR, DPF differential pressure, boost pressure, wiring/CAN errors)
- Visually inspect sensor, connector, and wiring harness for damage, corrosion, or heat exposure
- Backprobe the sensor connector and measure reference, signal and ground with a multimeter or scope
- Check sensor port/hose for blockages, soot or mechanical restriction
- Wiggle wiring and connectors while monitoring live data to reproduce the fault
Signal parameters
- Sensor supply/reference: typically 5 V reference from ECM (verify vehicle-specific spec)
- Signal output (analog): typically 0.5–4.5 V across the sensor operating range (varies by manufacturer)
- Expected behavior: signal voltage should change smoothly with exhaust pressure/load; no signal or pegged voltage indicates fault
- Resistance or sensor-specific values: check OEM specification for exact sensor resistance or pressure-to-voltage mapping
Diagnostic algorithm
- Use an OBD-II scanner to confirm P0470, record freeze frame data and clear the code. If code returns, proceed.
- Perform a visual inspection of the exhaust pressure sensor, connector and wiring for damage, corrosion, melted insulation or soot in the port. Repair or replace obvious issues.
- With ignition ON (engine OFF), backprobe the sensor connector. Verify the reference voltage from the ECM (usually ~5 V) and a good ground. If reference or ground is missing, trace/repair wiring to ECM.
- Start the engine and monitor the sensor signal voltage with a multimeter or oscilloscope. Verify the voltage changes with engine speed/load. If signal is stuck high or low, test for short to battery or ground.
- If wiring and power/ground are good but signal is incorrect, disconnect the sensor and check for open circuit or incorrect resistance per manufacturer spec. Replace sensor if out of spec.
- Inspect and clear the sensor port/hose (remove soot/clogs). Reinstall and retest for proper signal behavior.
- If wiring, connector and sensor check good, inspect ECM grounds and fuses. Perform harness continuity checks between sensor and ECM for intermittent opens/shorts.
- If fault persists with correct wiring and a known-good sensor, consult vehicle-specific service information for ECM testing or software updates; consider ECM repair/reprogramming as last step.
- After repairs, clear codes and perform a road test and scan-tool verification of live data to ensure code does not return.
Likely causes
- Broken or chafed wiring between sensor and ECM
- Corroded/loose connector at the sensor
- Failed exhaust pressure sensor
- Blocked sensor port or clogged fitting preventing correct pressure reading
Fault status
Status
P0470 - Exhaust Pressure Sensor A Circuit. Indicates open, short, out-of-range or implausible signal from the exhaust pressure sensor circuit.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
Similar codes
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Code
P0470
HUMMER
P — Powertrain
Exhaust Pressure Sensor Malfunction
Views:
UK: 16
EN: 29
RU: 16
AI status
Completed
Completed
100%
Causes
- Damaged or corroded sensor connector or wiring (open, short to ground or battery, high resistance)
- Faulty exhaust pressure sensor (internal failure)
- Restricted or blocked sensor port/hoses or clogged sensor pickup
- Excessive heat or contamination damaging the sensor
- Poor ground or supply reference from ECM
- Faulty ECM or incorrect software/calibration
Symptoms
- Check Engine Light / MIL illuminated
- DPF regeneration issues (failed or inhibited regen)
- Reduced engine performance or limp mode on some vehicles
- Increased emissions or smoke during acceleration
- Stored fault codes related to EGR/aftertreatment or boost control in some systems
What to check
- Read freeze frame and freeze data with a scan tool; confirm P0470 is current and note conditions when set
- Scan for related codes (EGR, DPF differential pressure, boost pressure, wiring/CAN errors)
- Visually inspect sensor, connector, and wiring harness for damage, corrosion, or heat exposure
- Backprobe the sensor connector and measure reference, signal and ground with a multimeter or scope
- Check sensor port/hose for blockages, soot or mechanical restriction
- Wiggle wiring and connectors while monitoring live data to reproduce the fault
Signal parameters
- Sensor supply/reference: typically 5 V reference from ECM (verify vehicle-specific spec)
- Signal output (analog): typically 0.5–4.5 V across the sensor operating range (varies by manufacturer)
- Expected behavior: signal voltage should change smoothly with exhaust pressure/load; no signal or pegged voltage indicates fault
- Resistance or sensor-specific values: check OEM specification for exact sensor resistance or pressure-to-voltage mapping
Diagnostic algorithm
- Use an OBD-II scanner to confirm P0470, record freeze frame data and clear the code. If code returns, proceed.
- Perform a visual inspection of the exhaust pressure sensor, connector and wiring for damage, corrosion, melted insulation or soot in the port. Repair or replace obvious issues.
- With ignition ON (engine OFF), backprobe the sensor connector. Verify the reference voltage from the ECM (usually ~5 V) and a good ground. If reference or ground is missing, trace/repair wiring to ECM.
- Start the engine and monitor the sensor signal voltage with a multimeter or oscilloscope. Verify the voltage changes with engine speed/load. If signal is stuck high or low, test for short to battery or ground.
- If wiring and power/ground are good but signal is incorrect, disconnect the sensor and check for open circuit or incorrect resistance per manufacturer spec. Replace sensor if out of spec.
- Inspect and clear the sensor port/hose (remove soot/clogs). Reinstall and retest for proper signal behavior.
- If wiring, connector and sensor check good, inspect ECM grounds and fuses. Perform harness continuity checks between sensor and ECM for intermittent opens/shorts.
- If fault persists with correct wiring and a known-good sensor, consult vehicle-specific service information for ECM testing or software updates; consider ECM repair/reprogramming as last step.
- After repairs, clear codes and perform a road test and scan-tool verification of live data to ensure code does not return.
Likely causes
- Broken or chafed wiring between sensor and ECM
- Corroded/loose connector at the sensor
- Failed exhaust pressure sensor
- Blocked sensor port or clogged fitting preventing correct pressure reading
Fault status
Status
P0470 - Exhaust Pressure Sensor A Circuit. Indicates open, short, out-of-range or implausible signal from the exhaust pressure sensor circuit.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P0470
MERCEDES-BENZ
P — Powertrain
Exhaust Pressure Sensor Malfunction
Views:
UK: 15
EN: 33
RU: 18
AI status
Completed
Completed
100%
Causes
- Damaged or corroded sensor connector or wiring (open, short to ground or battery, high resistance)
- Faulty exhaust pressure sensor (internal failure)
- Restricted or blocked sensor port/hoses or clogged sensor pickup
- Excessive heat or contamination damaging the sensor
- Poor ground or supply reference from ECM
- Faulty ECM or incorrect software/calibration
Symptoms
- Check Engine Light / MIL illuminated
- DPF regeneration issues (failed or inhibited regen)
- Reduced engine performance or limp mode on some vehicles
- Increased emissions or smoke during acceleration
- Stored fault codes related to EGR/aftertreatment or boost control in some systems
What to check
- Read freeze frame and freeze data with a scan tool; confirm P0470 is current and note conditions when set
- Scan for related codes (EGR, DPF differential pressure, boost pressure, wiring/CAN errors)
- Visually inspect sensor, connector, and wiring harness for damage, corrosion, or heat exposure
- Backprobe the sensor connector and measure reference, signal and ground with a multimeter or scope
- Check sensor port/hose for blockages, soot or mechanical restriction
- Wiggle wiring and connectors while monitoring live data to reproduce the fault
Signal parameters
- Sensor supply/reference: typically 5 V reference from ECM (verify vehicle-specific spec)
- Signal output (analog): typically 0.5–4.5 V across the sensor operating range (varies by manufacturer)
- Expected behavior: signal voltage should change smoothly with exhaust pressure/load; no signal or pegged voltage indicates fault
- Resistance or sensor-specific values: check OEM specification for exact sensor resistance or pressure-to-voltage mapping
Diagnostic algorithm
- Use an OBD-II scanner to confirm P0470, record freeze frame data and clear the code. If code returns, proceed.
- Perform a visual inspection of the exhaust pressure sensor, connector and wiring for damage, corrosion, melted insulation or soot in the port. Repair or replace obvious issues.
- With ignition ON (engine OFF), backprobe the sensor connector. Verify the reference voltage from the ECM (usually ~5 V) and a good ground. If reference or ground is missing, trace/repair wiring to ECM.
- Start the engine and monitor the sensor signal voltage with a multimeter or oscilloscope. Verify the voltage changes with engine speed/load. If signal is stuck high or low, test for short to battery or ground.
- If wiring and power/ground are good but signal is incorrect, disconnect the sensor and check for open circuit or incorrect resistance per manufacturer spec. Replace sensor if out of spec.
- Inspect and clear the sensor port/hose (remove soot/clogs). Reinstall and retest for proper signal behavior.
- If wiring, connector and sensor check good, inspect ECM grounds and fuses. Perform harness continuity checks between sensor and ECM for intermittent opens/shorts.
- If fault persists with correct wiring and a known-good sensor, consult vehicle-specific service information for ECM testing or software updates; consider ECM repair/reprogramming as last step.
- After repairs, clear codes and perform a road test and scan-tool verification of live data to ensure code does not return.
Likely causes
- Broken or chafed wiring between sensor and ECM
- Corroded/loose connector at the sensor
- Failed exhaust pressure sensor
- Blocked sensor port or clogged fitting preventing correct pressure reading
Fault status
Status
P0470 - Exhaust Pressure Sensor A Circuit. Indicates open, short, out-of-range or implausible signal from the exhaust pressure sensor circuit.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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HTML ManualYour experience will help others
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