P24ABEGR Cooler Coolant Pump Stuck On
- 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
- P24AB is set when the EGR cooler coolant pump keeps running although the controller has switched it off, seen for instance in continued speed feedback or current draw. Causes include a driver stage or relay that stays closed, a short that bypasses the switching side, or pump electronics that ignore the command. For the driver this is less urgent than a pump that will not run, but a constantly running pump drains the battery after shut-off and can slow engine warm-up. Public documentation of this check by a carmaker was not found; it follows from CARB's demand that switched outputs be verified in operation. P24A8 covers the opposite failure, P24A9 a short to ground that may keep the pump running.
- What you may notice
- Pump audible after engine shut-off
- Battery drained after standing
- Malfunction indicator lamp on
- Likely causes
- LikelyRelay or controller output stage stuck closed
- PossibleShort in the harness bypassing the switched side
- RarePump electronics no longer responding to the command
- 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 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.