Transmission Brake B Stuck On
The P2934 code means the vehicle's onboard diagnostic system has detected: Transmission Brake B Stuck On. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $800 - $3,500 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
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Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Transmission locked in gear
- Harsh engagement or grinding
- Check Engine Light on
- Vehicle may not move or moves in wrong gear
Probable Causes (Ranked by Likelihood)
- Stuck apply piston or servo Very High
- Hydraulic circuit blockage High
- Valve body malfunction Moderate
- Contaminated transmission fluid causing sticking Low
Step-by-Step Diagnostic Procedure
-
Scan for DTCs and freeze frame
-
Perform clutch apply/release tests
-
Check hydraulic pressure in affected circuit
-
Inspect valve body for stuck valves
Frequently Asked Questions
Is this a serious problem?
Yes, this indicates a significant internal transmission issue that requires prompt professional attention.
Can a fluid change help?
A fluid change is unlikely to resolve this specific issue, though it should be part of any transmission service.
How much does repair cost?
Typical repair costs range from $800 - $3,500 depending on the specific cause and vehicle.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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