P2E48Hybrid/EV Electronics Coolant Pump B 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
- With P2E48 the controller sees electronics coolant pump B turning faster than commanded, without the separate dry-run test (P2E46) having fired. The usual reason is lost load, since a centrifugal pump accelerates when its impeller gets less liquid, whether from a low level, a collapsed suction hose, partial air or an impeller slipping on its shaft. A Continental patent for electric fuel pumps (US20120245819) compares pump current with voltage or speed to spot leakage or dry running without a pressure sensor. Mercedes' bulletin on pump A's P2B2A7A in the 167 series links excessive speed to leakage or a failed seal. Ford's 2024 summary combines overspeed and dry run in one fault type (B1). No manufacturer publicly documents P2E48. A false speed signal is rarer.
- What you may notice
- MIL, sometimes with a coolant level warning
- Louder pump noise than usual
- Rising electronics temperatures and power limits
- Likely causes
- LikelyLow level or residual air in the electronics loop
- PossibleCollapsed or kinked hose on the pump inlet side
- RareImpeller slipping on the pump shaft
- RareImplausible speed feedback from the pump electronics
- 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: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.