P277DElectric/Auxiliary Transmission Fluid Pump B Motor Over Temperature
- Generic OBD-II code · Powertrain
- How the car detects it
- P277D reports that the motor or the integrated electronics of auxiliary pump B have become too hot. Pumps of this kind measure their own temperature and stop before damage occurs; the code records that protective shutdown. Heat builds up when the pump runs long at high load, for example many stop-start phases in hot traffic, when it drags mechanically, when the fluid is overheated or degraded, or when its cooling path is blocked. No manufacturer documents P277D publicly. For pump A, Ford's 2024 summary of the 10R60/10R80 and 8F57 gearboxes has the counterpart: an over-temperature message from the pump becomes P175A, in UDS form P0C29_4B; P0DE4 is the generic pump A code. Once the pump has cooled it may work again, so a recurring code calls for checking current draw and fluid condition.
- What you may notice
- Stop-start temporarily unavailable, especially in hot weather
- Warning lamp or transmission message
- Likely causes
- LikelyLong high-load operation in hot conditions
- PossibleMechanical drag raising motor current and heat
- PossibleOverheated or aged transmission fluid
- RareFaulty temperature sensing in the pump electronics
- Repair
- Hard · Usually a job for a workshop.Typical cost: €0 – €1,400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.