P23E3EGR C Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P23E3 says the control circuit of EGR valve C reads low. On motor or solenoid driven EGR valves this mostly means one of the drive lines has a short to ground, so the output stage would draw excessive current or sees a level it cannot produce by itself. The module then switches the driver off to protect it, and the valve falls back to its spring position, usually closed. For valves A and B the corresponding codes are P0489 and P045C; GM's 2018 diesel tables list both among the faults that request shut-off of the respective EGR position control. No manufacturer documents P23E3 publicly, and no thresholds for valve C are published. CARB requires EGR output circuits to be monitored. Expect higher NOx with little change in driving, plus the warning lamp. High fault: P23E4.
- What you may notice
- Warning lamp, little change in driving
- EGR path C switched off
- Likely causes
- LikelyDrive wire of valve C shorted to ground
- PossibleInternal short in the valve C motor or coil
- RareFaulty output stage in the engine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.