P24A8EGR Cooler Coolant Pump Performance/Stuck Off
- 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
- Unlike the circuit codes, P24A8 is about the pump's effect: it is commanded on, the wiring looks fine, yet the controller concludes that it does not deliver, for example because its speed feedback stays low or the expected temperature drop across the EGR cooler is missing. Air trapped after a coolant change, a blocked impeller, low coolant level or a seized motor are the usual reasons. How a maker detects the missing delivery is not published anywhere we could verify; CARB's requirement to test outputs for function and supplier material placing the cooler within the engine's coolant loop are the footing here. P24AB is the reverse, a pump that cannot be switched off. Continued operation risks boiling coolant in the cooler and cracking.
- What you may notice
- Malfunction indicator lamp on
- Coolant loss or bubbling at the expansion tank
- EGR temperature or cooler efficiency codes may follow
- Likely causes
- LikelyAir pocket in the auxiliary circuit after service or a leak
- PossiblePump motor seized or impeller blocked
- PossibleLow coolant level
- 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 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.