P0755Shift Solenoid B
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- A shift solenoid is an electrically switched valve in the valve body. Manufacturers use these codes differently: Ford reports an open circuit with the base code and shorts separately, newer GM units have separate low/high codes, and the letter is not tied to a valve number (Saab's 9-5: A = valve S2). P0755 is the general code for solenoid B, used in practice like P0750 for an open circuit: Ford flags driver feedback disagreeing with the command for 0.5–5 s, with shorts as P0976/P0977; on Ford's 6R80 solenoid B is the proportional valve of the clutch for third, fifth and reverse. Ram's 6.7 L calls it 'control circuit open'. GM uses P0758 or P0976/P0977 instead. The transmission enters limp mode with harsh shifts.
- What you may notice
- Check engine or transmission warning lamp
- Limp mode in a fixed gear, no upshifts
- Harsh shifts from maximum line pressure
- Likely causes
- LikelyOpen or corroded wire or transmission pass-through connector
- PossibleSolenoid coil open or shorted
- PossibleInternal harness or electronic module in the transmission
- RareModule driver faulty or valve supply missing
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.