P0E3CHybrid/EV Battery Coolant Pump Underspeed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0E3C is set when the battery coolant pump stays below the speed it has been asked for. GM documents it specifically for the 2024–25 Chevrolet Corvette E-Ray: the battery energy control module (K16) stores P0E3C, and the ECM may add P0A7B to switch on the MIL. Bulletin 24-NA-160 traces it to air collecting in the hoses next to the pump after an earlier repair; the pump halts to protect itself, which the module reads as underspeed. The fix is to lower the pump below the other plumbing and have a scan tool spin it for a quarter of an hour at 4,000 rpm, topping up the 1.9 litre loop, and to repeat if needed. Only if the code returns after two or more purges is the pump itself diagnosed. Overspeed of the same pump is P0E3B.
- What you may notice
- MIL on, with P0A7B stored in the ECM (Corvette E-Ray)
- Electric front-axle drive limited when the battery gets hot
- Likely causes
- LikelyAir trapped around the pump after earlier service (GM 24-NA-160)
- PossibleWorn pump bearing or debris slowing the impeller
- RareLow supply voltage or poor ground at the pump
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.