P0E3BHybrid/EV Battery Coolant Pump Overspeed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0E3B indicates that the electric pump circulating coolant through the high-voltage battery turns faster than commanded. A pump that suddenly spins too freely has usually lost its load, because it is moving air instead of coolant after a leak, a low reservoir or a poorly bled system. No manufacturer documents P0E3B publicly. GM's 2019 hybrid tables (19OBDG01) show how such a check works under a maker-specific code (P19FF): the controller filters the difference between commanded and reported pump speed and flags a deviation in either direction; if the pump is meant to be off but still reports over 250 rpm, that counts as well, all as Type B. The sibling P0E3C covers a pump that is too slow. Battery cooling may be reduced and charge or power limited.
- What you may notice
- Hybrid or EV system warning
- Reduced charging or drive power when the battery warms up
- Likely causes
- LikelyLow coolant level or leak, pump running partly dry
- PossibleAir left in the battery loop after a repair
- RareFaulty pump electronics or speed feedback signal
- 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: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.