OBD code information sheet
https://obdauto.ro/cod/P277C?lang=en
Electric/Auxiliary Transmission Fluid Pump B Motor Stalled
Technical explanation
Electric/Auxiliary Transmission Fluid Pump B Motor Stalled. Basic catalogue definition; diagnostic details have not yet been reviewed.
Transmission and control signals
General system guidance · not a confirmed diagnosis
A sensor, solenoid circuit and incorrect ratio are different conditions. Confirm the exact transmission type.
The association is based on the imported description. This information explains the system; it does not confirm a procedure for the exact code, model or engine. Verify applicability in manufacturer documentation.
Checks for this type of system
- Read the transmission controller, not only the engine.
- Compare requested gear, speed signals and fault state.
- Check fluid level only using the applicable gearbox procedure.
Useful diagnostic data, where available
- Selector/gear, temperature and available speed signals.
- Calculated slip and commands where supported.
Normal values and thresholds vary by vehicle and are not assumed here.
Mistakes to avoid
- Do not reset adaptations as a universal diagnostic test.
- Never transfer pressure specifications between gearboxes.
System-guide sources
- HELLA — transmission signal diagnosis
- Ford — OBD monitor examples; Ford-specific thresholds are not universal
References support general principles, not individual verification of every associated code.
Continue your research
Links to related systems, warning lights and vehicle examples.
Experiences with this code
User-reported cases published after moderation. Approval does not verify the diagnosis; the same code can have different causes.
No approved English experiences for this definition yet.
Similar codes
General code
Transmission Friction Element A Apply Time Range/Performance
Engine & powertrain
General code
Transmission Friction Element B Apply Time Range/Performance
Engine & powertrain
General code
Transmission Friction Element C Apply Time Range/Performance
Engine & powertrain
