What it means
Same as P23E1 with the actuator electrically intact but not delivering the commanded position. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
EGR valve C meters exhaust into the intake through the C stage or loop to help limit peak combustion temperature. The module sees an electrically intact actuator that does not deliver the commanded position, so the fault may be mechanical sticking, restricted flow, or inaccurate position feedback.
Common causes
Most likely first.
- EGR valve C sticking or restricted by deposits
- Fault in the valve position feedback or actuator linkage
- Restricted EGR passage or cooler
- Electrical or vacuum control problem, if applicable
Symptoms
- Check engine light
- Possible rough idle, hesitation, or reduced power
- Increased emissions or failed emissions test
How to diagnose it
- Save freeze-frame data and compare commanded and reported EGR valve C position in live data during the conditions that set the code.
- Inspect the valve C connector, actuator linkage, and nearby wiring for loose connections, damage, or movement that is obstructed.
- Check the EGR C valve and passage for soot or debris that could prevent the valve from reaching its commanded position.
- If accessible, inspect the C-loop cooler and connecting passages for restrictions that could limit valve response or flow.
- Test valve C position feedback, actuator operation, and any applicable vacuum or electrical controls against the manufacturer's specification.
Common fixes
- Clean deposits from the EGR C valve or passage if they are preventing free movement.
- Repair a poor connector, wiring connection, or applicable vacuum control fault.
- Repair the valve C linkage or position-feedback fault.
- Replace the EGR valve C or repair a restricted cooler if testing confirms the fault.
Can I keep driving?
If the engine runs smoothly, limited driving may be possible, but avoid heavy acceleration if it hesitates or loses power. Continued operation can increase emissions, and excessive EGR flow may cause rough running or misfires.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.