P1911 Code: Variable Force Solenoid B Pressure Output Failed Low
🟠 Moderate severity · drivable
You can usually drive, but shifting may be harsh or delayed, so avoid heavy driving until it's fixed.
What P1911 means
The variable force solenoid B in the transmission isn't producing the hydraulic pressure the engine computer expects. This solenoid controls fluid pressure that operates shifting, and when its output stays too low the computer stores P1911.
Symptoms
- Check engine light is on
- Harsh or delayed shifts
- Transmission slipping
- Possible limp mode
Common causes
- most common: Faulty variable force solenoid B
- common: Damaged wiring or connector
- common: Low or dirty transmission fluid
- less common: Clogged valve body
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the variable force solenoid B | Mechanic | $150–400 |
| Check and replace the transmission fluid | Yes | $60–150 |
| Inspect and repair solenoid wiring | Yes | $20–100 |
Frequently asked questions
Can I drive with a P1911 code?
Yes, usually, but shifting may feel harsh or delayed. Avoid heavy acceleration and towing until the solenoid is fixed.
What does variable force solenoid B do?
It controls hydraulic pressure inside the transmission that helps shift gears smoothly. When it fails low, shifts can become rough or the transmission can slip.
How much does it cost to fix a P1911?
Expect $150–$400 for a new solenoid with labor, plus $60–$150 if the fluid also needs replacing.
Related codes
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.