P23E4EGR C Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P23E4 is the high counterpart: the control circuit of EGR valve C carries a level that is too high. Typical are a drive line touching a battery feed, a connector pin bent onto a supply terminal, or an output stage that no longer pulls its side low. Unlike a ground short, a short to voltage can leave the actuator partly energized, so depending on the design the valve may move unexpectedly or not at all. The equivalents for valves A and B are P0490 and P045D. Which component carries the letter C differs between manufacturers, and none publishes P23E4 with thresholds. Under the CARB rule such output faults have to be detected. The engine usually runs normally, EGR path C is switched off and the warning lamp comes on. Related: P23E1, P23E3.
- What you may notice
- Warning lamp on
- Valve C moves unexpectedly or not at all
- Likely causes
- LikelyDrive wire of valve C touching a battery feed
- PossibleBent pin in the valve C connector
- RareEngine module output stage not pulling low
- 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.