P0755
Shift Solenoid B
Transmission
Generic OBD-II
Medium
What it means
P0755 means the transmission control module has detected a fault in the shift solenoid B circuit. This solenoid directs hydraulic pressure to engage specific gears, so a fault can cause harsh or erratic shifting, a gear that won't engage, or limp mode. The engine still starts and runs — the problem is in the transmission's shifting, often from a bad solenoid, wiring, or dirty fluid.
Medium
Can I keep driving? Usually driveable, but the transmission may shift harshly, skip a gear, or drop into limp mode — get it diagnosed soon to avoid overheating and further wear.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh, delayed, or erratic shifting
- Transmission stuck in one gear or in limp mode
- Slipping between gears
- Reduced fuel economy
Common causes
Most likely first
- Faulty shift solenoid BLikely
- Low or dirty transmission fluid clogging the solenoidCommon
- Open or shorted wiring in the shift solenoid B circuitCommon
- Corroded or loose electrical connectorLess often
- Faulty transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Check transmission fluid level and condition first — service it if low, burnt, or dirty.
- Read freeze-frame data and check for related shift-solenoid codes.
- Inspect the solenoid wiring and connector for damage or corrosion.
- Measure the shift solenoid B resistance and compare to spec; replace if out of range.
- If wiring and solenoid are good, investigate the valve body and TCM.
FAQ
Quick answers
Is it safe to drive with P0755?+
For a short distance, yes, but the transmission may shift harshly or enter limp mode. Prolonged driving with a slipping or overheating transmission risks internal damage, so repair it promptly.
Can I just clear P0755?+
It will come back until the solenoid, wiring, or fluid problem is fixed. Checking the fluid and the solenoid connector first is the cheapest place to start.
Related codes
Often seen with P0755
Read & clear P0755 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX