OBD-II code · Powertrain (generic, extended)
P24AB EGR Cooler Coolant Pump Stuck On
The pump or its driver is stuck on - the pump runs continuously, even with the engine off, draining battery and bleeding heat from the engine.
Is it safe to drive with P24AB?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDriver stage stuck on
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Cooler Coolant Pump
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.