P0757
Shift Solenoid 'B' Stuck On
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The P0757 code indicates that shift solenoid B is stuck in the on (open) position. Unlike P0756 where the solenoid is stuck off, this code means hydraulic fluid is continuously flowing through the solenoid's circuit. This typically results in the transmission being stuck in a higher gear, difficulty downshifting, and potentially stalling when the vehicle comes to a stop because the transmission cannot shift down to first gear.
This is a moderately serious condition because driving with the solenoid stuck on forces the transmission into abnormal operating conditions. The vehicle may enter limp mode, restricting you to a single gear for protection. Continued driving in this state increases wear on clutch packs and bands inside the transmission, which can escalate a relatively simple solenoid repair into a full transmission rebuild.
The most common cause is contaminated transmission fluid that has physically jammed the solenoid plunger. Start by checking your fluid — if it's dark, burnt-smelling, or has visible debris, a fluid and filter change may resolve the issue. If the fluid is clean, the solenoid itself likely needs replacement. This is a job that typically involves removing the transmission pan and accessing the valve body, so most car owners will want to have this done at a transmission specialty shop.
Severity
Symptoms
- •Transmission stuck in third gear
- •Unable to downshift when decelerating
- •Vehicle may stall when coming to a stop
- •Check Engine Light illuminated
- •Harsh engagement when shifting into Drive or Reverse
Likely Causes
The solenoid valve is mechanically stuck in the open position, continuously allowing hydraulic fluid to flow when it should be closed.
Debris, varnish, or sludge from old transmission fluid can physically jam the solenoid plunger in the open position.
A short to voltage in the solenoid circuit keeps the solenoid energized continuously, holding it in the on position regardless of TCM commands.
The valve body passages associated with solenoid B may be scored or have debris, keeping the valve in the engaged position.
The Transmission Control Module may be incorrectly commanding the solenoid to stay on due to an internal software or hardware fault.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace shift solenoid B or solenoid pack
- Perform transmission fluid and filter change
- Repair shorted wiring in the solenoid harness
- Clean or replace the valve body
Shop Parts
Videos
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