P0DE4Electric/Auxiliary Transmission Fluid Pump A Motor Over Temperature
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0DE4 reports that the electric motor of auxiliary transmission fluid pump A has run too hot. Such a pump keeps the transmission pressurised while the engine is stopped, either by start-stop or during electric driving in a hybrid. No manufacturer documents P0DE4 publicly. Ford's 2019 hybrid OBD summary shows how its plug-in hybrids treat pump heat under other codes: once the pump circuit board exceeds 130 °C for 3 s the TCM logs P175A and disables the pump, and above 135 °C the event feeds the stall code P0C2A. Heat builds when the motor labours against low, aged or very cold fluid, against a binding rotor, or in a hot transmission. The car then usually keeps the engine running instead of stopping or driving electrically. P0C1B is the controller electronics, P277D the motor of pump B.
- What you may notice
- Start-stop no longer shuts the engine off
- Electric driving limited, engine keeps running
- Harsh engagement when pulling away after a stop
- Malfunction indicator lamp on
- Likely causes
- LikelyLow, aged or wrong transmission fluid making the pump work harder
- PossibleBinding rotor or worn bearing in the pump motor
- PossibleTransmission running hot (towing, heat, restricted fluid cooler)
- RareFaulty temperature evaluation in the pump controller or outdated software
- 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.