P0780: Shift Malfunction
Severity: high
What it means: The transmission computer detected a shift malfunction.
Safe to drive? Limited. Unexpected shifts or slipping are risky in traffic.
Common symptoms
- Check-engine light
- Harsh, slipping or delayed shifts
- Possible limp mode (stuck in one gear)
Likely causes, ranked
- Low or degraded transmission fluidDIY
- Faulty shift solenoids or valve bodyShop
- Internal wearShop
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What it means: The transmission computer detected a shift malfunction.
Severity: High. Safe to drive? Limited. Unexpected shifts or slipping are risky in traffic.
DIY or shop?
Check the fluid level and condition if your transmission allows it. Diagnosis is usually a shop job.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic. This code can involve stalling, engine damage or loss of power. If the check-engine light is flashing, or the car stalls or runs badly, stop driving and have it inspected.
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