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.
Medium severity. Can I keep driving?Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
Symptoms
- Check engine or transmission warning lamp
- Limp mode in a fixed gear, no upshifts
- Harsh shifts from maximum line pressure
Most likely causes
- Open or corroded wire or transmission pass-through connector
- Solenoid coil open or shorted
- Internal harness or electronic module in the transmission
- Module driver faulty or valve supply missing
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P0755 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 7: Transmission
- 55: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0755?
Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
What causes code P0755?
The most common causes are: open or corroded wire or transmission pass-through connector; solenoid coil open or shorted; internal harness or electronic module in the transmission.
Related codes
- P0758Shift Solenoid B Electrical
- P0976Shift Solenoid B Control Circuit Low
- P0977Shift Solenoid B Control Circuit High
- P0756Shift Solenoid B Performance/Stuck Off
- P0750Shift Solenoid A
Sources
- newtonnet.co.uk: fordobd2012
- fordservicecontent.com: obd summary diesel 2023
- static.nhtsa.gov: MC 10241065 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.