Transmission One-Way Clutch A Slipping
The P2940 code means the vehicle's onboard diagnostic system has detected: Transmission One-Way Clutch A Slipping. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $600 - $3,000 (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 slipping during shifts
- RPM flare without corresponding acceleration
- Check Engine Light on
- Burning smell from transmission
Probable Causes (Ranked by Likelihood)
- Worn friction material Very High
- Low transmission fluid High
- Overheated transmission Moderate
- Excessive clutch clearance Low
Step-by-Step Diagnostic Procedure
-
Check fluid level and condition
-
Monitor slip rate with scan tool
-
Perform stall test
-
Inspect fluid for friction material debris
Frequently Asked Questions
Is this a serious problem?
This is a moderate concern that should be addressed soon to prevent further damage.
Can a fluid change help?
Fresh fluid may temporarily improve slipping, but worn friction elements need replacement.
How much does repair cost?
Typical repair costs range from $600 - $3,000 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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