P23E2EGR C Control Circuit Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P23E2 is raised when the drive circuit of EGR valve C is electrically intact but the valve does not respond to it as expected: commanded and measured position, or drive current and movement, drift apart. In GM's 2018 diesel calibration the A-side check P0404 compares setpoint and measured position of the high-pressure EGR valve and fails above a 10 % tracking error in 152 of 190 samples, with coolant at least 60 °C and outside air above −7 °C; it is a Type B code. Soot and lacquer, which over time stiffen EGR valves, are the usual reason, a worn gear train or a weak motor the next. No manufacturer documents P23E2 publicly; CARB asks that EGR control be checked for proper function. Circuit faults on valve C: P23E1, P23E3, P23E4.
- What you may notice
- Warning lamp after warm-up drives
- Occasional hesitation when EGR is cut
- Likely causes
- LikelySoot and lacquer making valve C sluggish
- PossibleWorn gears or linkage in the valve C actuator
- RareActuator motor of valve C losing torque
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.