What P0755 means
A shift solenoid is an electrically switched valve in the valve body.
How the engine computer detects it
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.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
Symptoms
- Check engine or transmission warning lamp
- Limp mode in a fixed gear, no upshifts
- Harsh shifts from maximum line pressure
Common causes
- Open or corroded wire or transmission pass-through connector Most likely
- Solenoid coil open or shorted Possible
- Internal harness or electronic module in the transmission Possible
- Module driver faulty or valve supply missing Less likely
How to diagnose P0755
- Read every stored code with an OBD-II scanner. If misfire or fuel trim codes are there too, fix those first: they often cause this one.
- Inspect the parts involved: shift solenoid, transmission valve body, transmission wiring, transmission control module.
- Work through the causes above from most to least likely, cheapest checks first.
- Clear the code and drive a full drive cycle to confirm the repair held.
Vehicles that report P0755 most
| Vehicle | Years | Reports | Share | Median miles |
|---|---|---|---|---|
| Toyota RAV4 | 2001–2010 | 15 | 114k |
Counts of owner complaints to the NHTSA that mention P0755 (21 in total), not failure rates: popular models get more complaints simply because more of them are on the road. Models with fewer than 3 complaints are left out.
Reading the code
- P
- Powertrain
- 0
- Generic (SAE) code
- 7
- Transmission
- 55
- Specific fault
Questions drivers ask
Can I drive with code P0755?
If the car shifts normally, drive gently to a shop. If it's stuck in one gear, slips, shifts harshly or won't move out of Park, don't drive it: have it towed.
Will my car pass an emissions inspection with P0755?
Probably not in states that test vehicles with an OBD-II scan: an emissions-related code that keeps the check engine light on is usually an automatic fail. Rules differ by state and county, so check yours.
Often reported together
Codes that owners mention in the same NHTSA complaints as P0755. They can point to a shared cause, so it's worth checking them together.
- P0750Shift Solenoid A7 complaints
- P0753Shift Solenoid A Electrical4 complaints
- P0758Shift Solenoid B Electrical4 complaints
- P0760Shift Solenoid C3 complaints
- P0765Shift Solenoid D3 complaints
- P1760Manufacturer-specific code3 complaints
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.