Code
P0403
Generic
P — Powertrain
EGR A Control Circuit/Open
Views:
UK: 27
EN: 59
RU: 64
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EGR control circuit
- Corroded, loose or damaged EGR connector
- Failed EGR solenoid/actuator
- Blown fuse or bad relay feeding the EGR circuit
- Faulty PCM (less common)
- Poor chassis or engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or hesitation
- Reduced engine performance or drivability issues
- Higher NOx emissions / failed emissions test
- Possible stalling at idle
- Check engine light with related EGR faults
What to check
- Read stored freeze frame and freeze data with a scan tool
- Visual inspection of EGR valve, solenoid, wiring and connectors for damage or corrosion
- Check relevant fuses and relays
- Backprobe EGR connector while commanding with scan tool to observe signal
- Measure continuity between PCM pin and EGR connector pin
- Measure coil resistance of EGR solenoid (compare to spec or typical range)
Signal parameters
- Key ON, engine OFF: 12 V supply should be present at the EGR solenoid power terminal (if applicable)
- Control side: PCM may switch ground or battery feed depending on design — expected to show change when commanded
- When commanded by scan tool: voltage or duty-cycle at control line should change from resting value to commanded value (0–100% duty or solid on/off)
- Typical EGR solenoid coil resistance (varies by manufacturer): commonly ~10–50 Ω — check vehicle-specific spec
- Open-circuit indication: infinite resistance (OL) between EGR actuator terminals or between actuator and PCM
Diagnostic algorithm
- Retrieve codes and freeze frame data. Note engine conditions when DTC set.
- Perform a visual inspection of the EGR valve/solenoid, harness, and connectors for damage, corrosion or heat damage.
- Check fuses/relays that supply the EGR circuits; replace if blown.
- With ignition ON (engine OFF), backprobe the EGR connector. Verify 12 V supply (if applicable) and good ground reference. Compare to wiring diagram for circuit polarity.
- Command the EGR valve ON/OFF with a scan tool while monitoring the control circuit voltage/duty. If PCM commands but no change at connector, suspect wiring between PCM and actuator.
- Remove connector and measure EGR actuator coil resistance. Open/infinite resistance = bad actuator.
- Check continuity between the PCM pin and the EGR connector pin. Repair any open or high-resistance sections.
- If wiring and actuator verify OK, check for intermittent faults by wiggle-testing harness under load/while commanded.
- Repair or replace faulty wiring, connector, fuse, relay or EGR actuator as required. After repair, clear codes and perform functional/road test to verify.
- If fault persists after harness and actuator replacement, consult manufacturer wiring diagrams and consider PCM/ground integrity testing or replacement.
Likely causes
- Disconnected or broken harness between PCM and EGR valve
- Pin pushed out or corrosion at connector causing open
- EGR solenoid coil failed open
- Fuse for emission solenoids blown
- Connector damaged by heat/road debris
Fault status
Status
EGR A Control Circuit/Open — indicates an open or incomplete electrical circuit in the PCM's control feed to the EGR valve/solenoid labeled A. The PCM cannot detect proper control feedback when commanding the EGR actuator.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P0403
GWM
P — Powertrain
- Malfunction in the exhaust gas recirculation system
Views:
UK: 6
EN: 25
RU: 25
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EGR control circuit
- Corroded, loose or damaged EGR connector
- Failed EGR solenoid/actuator
- Blown fuse or bad relay feeding the EGR circuit
- Faulty PCM (less common)
- Poor chassis or engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or hesitation
- Reduced engine performance or drivability issues
- Higher NOx emissions / failed emissions test
- Possible stalling at idle
- Check engine light with related EGR faults
What to check
- Read stored freeze frame and freeze data with a scan tool
- Visual inspection of EGR valve, solenoid, wiring and connectors for damage or corrosion
- Check relevant fuses and relays
- Backprobe EGR connector while commanding with scan tool to observe signal
- Measure continuity between PCM pin and EGR connector pin
- Measure coil resistance of EGR solenoid (compare to spec or typical range)
Signal parameters
- Key ON, engine OFF: 12 V supply should be present at the EGR solenoid power terminal (if applicable)
- Control side: PCM may switch ground or battery feed depending on design — expected to show change when commanded
- When commanded by scan tool: voltage or duty-cycle at control line should change from resting value to commanded value (0–100% duty or solid on/off)
- Typical EGR solenoid coil resistance (varies by manufacturer): commonly ~10–50 Ω — check vehicle-specific spec
- Open-circuit indication: infinite resistance (OL) between EGR actuator terminals or between actuator and PCM
Diagnostic algorithm
- Retrieve codes and freeze frame data. Note engine conditions when DTC set.
- Perform a visual inspection of the EGR valve/solenoid, harness, and connectors for damage, corrosion or heat damage.
- Check fuses/relays that supply the EGR circuits; replace if blown.
- With ignition ON (engine OFF), backprobe the EGR connector. Verify 12 V supply (if applicable) and good ground reference. Compare to wiring diagram for circuit polarity.
- Command the EGR valve ON/OFF with a scan tool while monitoring the control circuit voltage/duty. If PCM commands but no change at connector, suspect wiring between PCM and actuator.
- Remove connector and measure EGR actuator coil resistance. Open/infinite resistance = bad actuator.
- Check continuity between the PCM pin and the EGR connector pin. Repair any open or high-resistance sections.
- If wiring and actuator verify OK, check for intermittent faults by wiggle-testing harness under load/while commanded.
- Repair or replace faulty wiring, connector, fuse, relay or EGR actuator as required. After repair, clear codes and perform functional/road test to verify.
- If fault persists after harness and actuator replacement, consult manufacturer wiring diagrams and consider PCM/ground integrity testing or replacement.
Likely causes
- Disconnected or broken harness between PCM and EGR valve
- Pin pushed out or corrosion at connector causing open
- EGR solenoid coil failed open
- Fuse for emission solenoids blown
- Connector damaged by heat/road debris
Fault status
Status
EGR A Control Circuit/Open — indicates an open or incomplete electrical circuit in the PCM's control feed to the EGR valve/solenoid labeled A. The PCM cannot detect proper control feedback when commanding the EGR actuator.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P0403
HUMMER
P — Powertrain
Exhaust Gas Recirculation (EGR) Solenoid Control Circuit
Views:
UK: 20
EN: 46
RU: 39
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EGR control circuit
- Corroded, loose or damaged EGR connector
- Failed EGR solenoid/actuator
- Blown fuse or bad relay feeding the EGR circuit
- Faulty PCM (less common)
- Poor chassis or engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or hesitation
- Reduced engine performance or drivability issues
- Higher NOx emissions / failed emissions test
- Possible stalling at idle
- Check engine light with related EGR faults
What to check
- Read stored freeze frame and freeze data with a scan tool
- Visual inspection of EGR valve, solenoid, wiring and connectors for damage or corrosion
- Check relevant fuses and relays
- Backprobe EGR connector while commanding with scan tool to observe signal
- Measure continuity between PCM pin and EGR connector pin
- Measure coil resistance of EGR solenoid (compare to spec or typical range)
Signal parameters
- Key ON, engine OFF: 12 V supply should be present at the EGR solenoid power terminal (if applicable)
- Control side: PCM may switch ground or battery feed depending on design — expected to show change when commanded
- When commanded by scan tool: voltage or duty-cycle at control line should change from resting value to commanded value (0–100% duty or solid on/off)
- Typical EGR solenoid coil resistance (varies by manufacturer): commonly ~10–50 Ω — check vehicle-specific spec
- Open-circuit indication: infinite resistance (OL) between EGR actuator terminals or between actuator and PCM
Diagnostic algorithm
- Retrieve codes and freeze frame data. Note engine conditions when DTC set.
- Perform a visual inspection of the EGR valve/solenoid, harness, and connectors for damage, corrosion or heat damage.
- Check fuses/relays that supply the EGR circuits; replace if blown.
- With ignition ON (engine OFF), backprobe the EGR connector. Verify 12 V supply (if applicable) and good ground reference. Compare to wiring diagram for circuit polarity.
- Command the EGR valve ON/OFF with a scan tool while monitoring the control circuit voltage/duty. If PCM commands but no change at connector, suspect wiring between PCM and actuator.
- Remove connector and measure EGR actuator coil resistance. Open/infinite resistance = bad actuator.
- Check continuity between the PCM pin and the EGR connector pin. Repair any open or high-resistance sections.
- If wiring and actuator verify OK, check for intermittent faults by wiggle-testing harness under load/while commanded.
- Repair or replace faulty wiring, connector, fuse, relay or EGR actuator as required. After repair, clear codes and perform functional/road test to verify.
- If fault persists after harness and actuator replacement, consult manufacturer wiring diagrams and consider PCM/ground integrity testing or replacement.
Likely causes
- Disconnected or broken harness between PCM and EGR valve
- Pin pushed out or corrosion at connector causing open
- EGR solenoid coil failed open
- Fuse for emission solenoids blown
- Connector damaged by heat/road debris
Fault status
Status
EGR A Control Circuit/Open — indicates an open or incomplete electrical circuit in the PCM's control feed to the EGR valve/solenoid labeled A. The PCM cannot detect proper control feedback when commanding the EGR actuator.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P0403
LAND ROVER
P — Powertrain
Fault in the control of the position of the exhaust gas recirculation valve escape
Views:
UK: 11
EN: 36
RU: 34
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EGR control circuit
- Corroded, loose or damaged EGR connector
- Failed EGR solenoid/actuator
- Blown fuse or bad relay feeding the EGR circuit
- Faulty PCM (less common)
- Poor chassis or engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or hesitation
- Reduced engine performance or drivability issues
- Higher NOx emissions / failed emissions test
- Possible stalling at idle
- Check engine light with related EGR faults
What to check
- Read stored freeze frame and freeze data with a scan tool
- Visual inspection of EGR valve, solenoid, wiring and connectors for damage or corrosion
- Check relevant fuses and relays
- Backprobe EGR connector while commanding with scan tool to observe signal
- Measure continuity between PCM pin and EGR connector pin
- Measure coil resistance of EGR solenoid (compare to spec or typical range)
Signal parameters
- Key ON, engine OFF: 12 V supply should be present at the EGR solenoid power terminal (if applicable)
- Control side: PCM may switch ground or battery feed depending on design — expected to show change when commanded
- When commanded by scan tool: voltage or duty-cycle at control line should change from resting value to commanded value (0–100% duty or solid on/off)
- Typical EGR solenoid coil resistance (varies by manufacturer): commonly ~10–50 Ω — check vehicle-specific spec
- Open-circuit indication: infinite resistance (OL) between EGR actuator terminals or between actuator and PCM
Diagnostic algorithm
- Retrieve codes and freeze frame data. Note engine conditions when DTC set.
- Perform a visual inspection of the EGR valve/solenoid, harness, and connectors for damage, corrosion or heat damage.
- Check fuses/relays that supply the EGR circuits; replace if blown.
- With ignition ON (engine OFF), backprobe the EGR connector. Verify 12 V supply (if applicable) and good ground reference. Compare to wiring diagram for circuit polarity.
- Command the EGR valve ON/OFF with a scan tool while monitoring the control circuit voltage/duty. If PCM commands but no change at connector, suspect wiring between PCM and actuator.
- Remove connector and measure EGR actuator coil resistance. Open/infinite resistance = bad actuator.
- Check continuity between the PCM pin and the EGR connector pin. Repair any open or high-resistance sections.
- If wiring and actuator verify OK, check for intermittent faults by wiggle-testing harness under load/while commanded.
- Repair or replace faulty wiring, connector, fuse, relay or EGR actuator as required. After repair, clear codes and perform functional/road test to verify.
- If fault persists after harness and actuator replacement, consult manufacturer wiring diagrams and consider PCM/ground integrity testing or replacement.
Likely causes
- Disconnected or broken harness between PCM and EGR valve
- Pin pushed out or corrosion at connector causing open
- EGR solenoid coil failed open
- Fuse for emission solenoids blown
- Connector damaged by heat/road debris
Fault status
Status
EGR A Control Circuit/Open — indicates an open or incomplete electrical circuit in the PCM's control feed to the EGR valve/solenoid labeled A. The PCM cannot detect proper control feedback when commanding the EGR actuator.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P0403
MITSUBISHI
P — Powertrain
EGR control circuit
Views:
UK: 18
EN: 43
RU: 39
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in EGR control circuit
- Corroded, loose or damaged EGR connector
- Failed EGR solenoid/actuator
- Blown fuse or bad relay feeding the EGR circuit
- Faulty PCM (less common)
- Poor chassis or engine ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or hesitation
- Reduced engine performance or drivability issues
- Higher NOx emissions / failed emissions test
- Possible stalling at idle
- Check engine light with related EGR faults
What to check
- Read stored freeze frame and freeze data with a scan tool
- Visual inspection of EGR valve, solenoid, wiring and connectors for damage or corrosion
- Check relevant fuses and relays
- Backprobe EGR connector while commanding with scan tool to observe signal
- Measure continuity between PCM pin and EGR connector pin
- Measure coil resistance of EGR solenoid (compare to spec or typical range)
Signal parameters
- Key ON, engine OFF: 12 V supply should be present at the EGR solenoid power terminal (if applicable)
- Control side: PCM may switch ground or battery feed depending on design — expected to show change when commanded
- When commanded by scan tool: voltage or duty-cycle at control line should change from resting value to commanded value (0–100% duty or solid on/off)
- Typical EGR solenoid coil resistance (varies by manufacturer): commonly ~10–50 Ω — check vehicle-specific spec
- Open-circuit indication: infinite resistance (OL) between EGR actuator terminals or between actuator and PCM
Diagnostic algorithm
- Retrieve codes and freeze frame data. Note engine conditions when DTC set.
- Perform a visual inspection of the EGR valve/solenoid, harness, and connectors for damage, corrosion or heat damage.
- Check fuses/relays that supply the EGR circuits; replace if blown.
- With ignition ON (engine OFF), backprobe the EGR connector. Verify 12 V supply (if applicable) and good ground reference. Compare to wiring diagram for circuit polarity.
- Command the EGR valve ON/OFF with a scan tool while monitoring the control circuit voltage/duty. If PCM commands but no change at connector, suspect wiring between PCM and actuator.
- Remove connector and measure EGR actuator coil resistance. Open/infinite resistance = bad actuator.
- Check continuity between the PCM pin and the EGR connector pin. Repair any open or high-resistance sections.
- If wiring and actuator verify OK, check for intermittent faults by wiggle-testing harness under load/while commanded.
- Repair or replace faulty wiring, connector, fuse, relay or EGR actuator as required. After repair, clear codes and perform functional/road test to verify.
- If fault persists after harness and actuator replacement, consult manufacturer wiring diagrams and consider PCM/ground integrity testing or replacement.
Likely causes
- Disconnected or broken harness between PCM and EGR valve
- Pin pushed out or corrosion at connector causing open
- EGR solenoid coil failed open
- Fuse for emission solenoids blown
- Connector damaged by heat/road debris
Fault status
Status
EGR A Control Circuit/Open — indicates an open or incomplete electrical circuit in the PCM's control feed to the EGR valve/solenoid labeled A. The PCM cannot detect proper control feedback when commanding the EGR actuator.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
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0
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