Index coduri de defect · low
P0403
EGR circuit malfunction
EGR circuit malfunction
Scope: 2.2D · System(s): EMS/diesel
Common causes
- EGR solenoid/actuator
- wiring/connectors
- ECM
Quick checks
- Confirm freeze-frame and conditions when the code set
- Inspect connectors, grounds, and harness for the circuit named in the code
- Compare live sensor values vs expected (unplugged/biased sensors are common)
Typical fixes
- Check EGR actuator supply, ground, control wiring and movement
- replace actuator/valve only after circuit testing.