OBD-II code · Powertrain (generic)
P0403 EGR Control Circuit
The control circuit for the EGR valve solenoid is open or shorted. The ECM cannot drive the valve to the commanded position.
Is it safe to drive with P0403?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyEGR solenoid winding defective
- PossibleWiring or connector fault
- Less likelyECM driver stage damaged
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Valve, Egr Solenoid, Solenoid Wiring
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.