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.
Medium severity. Can I keep driving?Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
Symptoms
- Stop-start temporarily unavailable, especially in hot weather
- Warning lamp or transmission message
Most likely causes
- Long high-load operation in hot conditions
- Mechanical drag raising motor current and heat
- Overheated or aged transmission fluid
- Faulty temperature sensing in the pump electronics
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
What each character of P277D means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 7: Transmission
- 7D: Specific fault in that system
Frequently asked questions
Can I keep driving with code P277D?
Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
What causes code P277D?
The most common causes are: long high-load operation in hot conditions; mechanical drag raising motor current and heat; overheated or aged transmission fluid.
Related codes
- P0DE4Electric/Auxiliary Transmission Fluid Pump A Motor Over Temperature
- P276FElectric/Auxiliary Transmission Fluid Pump B Motor Current High
- P277CElectric/Auxiliary Transmission Fluid Pump B Motor Stalled
- P277BElectric/Auxiliary Transmission Fluid Pump B Driver Circuit Performance
Sources
- fordservicecontent.com: OBDSM2400OUTPUT 16Jul2024 WSM final V2 MCS7001
- static.nhtsa.gov: MC 10153066 9999
- law.cornell.edu: 13 CCR 1968.2
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.