P0829
PowertrainTransmissionhigh severity5-6 Shift
What P0829 Means
The transmission control module detected a problem during the 5-6 gear shift. The shift did not complete correctly or as commanded.
Symptoms
- Harsh or delayed 5-6 shift
- Transmission warning light on
- Slipping in higher gears
Common Causes
- Faulty shift solenoid
- Low or contaminated transmission fluid
- Worn clutches or internal components
- Faulty transmission control module
Diagnostic Steps
- Scan for codes and freeze frame data
- Check transmission fluid level and condition
- Test shift solenoid operation and pressures
- Inspect internal components if needed
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Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
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Serious DIY~$100
BlueDriver Pro →
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Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
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Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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