P0755 Code: Shift Solenoid B Malfunction
🟠 Moderate severity · drivable
Drivable, but shifting may be harsh or erratic and continued driving can damage the transmission. Fix it soon.
What P0755 means
The shift solenoid B isn't working correctly. A pressure control solenoid regulates transmission line pressure; when one malfunctions, the transmission can't shift or hold pressure the way it should. "Malfunction" is a general fault — the solenoid may be mechanically stuck, hydraulically blocked, or electrically weak.
Symptoms
- Check engine light on
- Harsh or erratic shifting
- Transmission may be stuck in one gear
- Possible limp mode
Common causes
- most common: Low or dirty transmission fluid
- common: Faulty shift solenoid B
- less common: Valve body or hydraulic circuit problem
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check and change the transmission fluid and filter | Yes | $100–250 |
| Replace the shift solenoid B | Mechanic | $200–500 |
Frequently asked questions
What is a shift solenoid?
It is an electrically-controlled valve that opens and closes to route transmission fluid, which is what engages and releases gears. A pressure control solenoid does the same for line pressure.
Is this code serious?
Yes. The transmission cannot shift or hold pressure properly, and continued driving can cause further internal damage.
How much does it cost to fix?
$100–250 for a fluid change, or $200–500 to replace the solenoid.
Related codes
P0756
P0756 Code: Shift Solenoid B Performance or Stuck Off
P0757P0757 Code: Shift Solenoid B Stuck On
P0758P0758 Code: Shift Solenoid B Electrical
Related guide: The 10 Most Common Check Engine Codes →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.