P0403: Exhaust Gas Recirculation (EGR) Control Circuit
The engine computer sees an electrical problem in the EGR valve control circuit.
Green, yellow, red: three ways P0403 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Drives normally.
Schedule a repair
Drivability changes or returns. Repair soon.
Stop and get help
Limp mode or stalling. Get it diagnosed.
Symptoms you might notice
- Check engine light
- Possible rough idle or power loss
Common causes, cheapest first
- Failed EGR valve solenoid
- Damaged wiring or connector
- Blown fuse
What you can check before calling
- Check the EGR connector
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
More egr codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0403 mean?
P0403 means "Exhaust Gas Recirculation (EGR) Control Circuit". The engine computer sees an electrical problem in the EGR valve control circuit.
Can I drive with code P0403?
It depends on what the vehicle is doing. Green: Drives normally. Yellow: Drivability changes or returns. Repair soon. Red: Limp mode or stalling. Get it diagnosed.
What causes P0403?
The most common causes are: failed EGR valve solenoid; damaged wiring or connector; blown fuse.
Is P0403 a serious code?
It can be. Limp mode or stalling. Get it diagnosed.
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