P24ACEGR Cooler Coolant Pump Feedback Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Electronically commutated coolant pumps often report their state back to the controller on a separate feedback wire, typically as a speed or diagnostic signal. P24AC means that this return line sits below its valid range: shorted to ground, pulled down by a damaged pump, or permanently in an error level the pump uses to signal a dry run or blockage. The control side can be healthy at the same time, which separates it from P24A9. Signal limits are not disclosed by any maker; CARB's rules on rationality and range checks of inputs serve as the reference. Because the controller can no longer confirm pump operation, it may treat the EGR cooler as unprotected and limit EGR.
- What you may notice
- Malfunction indicator lamp on
- EGR possibly reduced
- Likely causes
- LikelyFeedback wire shorted to ground
- PossiblePump signalling an internal fault, dry run or blockage
- RareCorroded feedback pin in the connector
- 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: €30 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.