P23E2 code meaning
EGR C Control Circuit Performance
Powertrain system Generic code P23xx codes Check engine light
What P23E2 means
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.
P23E2 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P23E2
- Warning lamp after warm-up drives
- Occasional hesitation when EGR is cut
Common causes of P23E2
- Most likelySoot and lacquer making valve C sluggish
- PossibleWorn gears or linkage in the valve C actuator
- Less likelyActuator motor of valve C losing torque
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR valve c
What each part of P23E2 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| E2 | The exact fault in that area. |
What to do next
- Note P23E2 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P23E2
What does P23E2 mean?
P23E2 means "EGR C Control Circuit Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P23E2?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P23E2 fail an emissions test?
Yes, it can. P23E2 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P23E2 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P23E2 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.