What Does P0829 Mean?
The transmission is experiencing a 5-6 shift malfunction. The TCM has detected abnormal behavior during the shift between 5th and 6th gears, which may include harsh engagement, slipping, flare-up (RPM spike without speed increase), or failure to complete the shift. This can be caused by mechanical, hydraulic, or electronic issues.
Common Causes
30%
Worn or damaged 5-6 shift clutch pack or band
25%
Faulty shift solenoid controlling the 5-6 shift (typically solenoid E or F)
20%
Low transmission fluid or degraded fluid causing insufficient shift pressure
15%
Valve body wear or stuck valves in the 5-6 shift circuit
10%
TCM adaptive learning corruption or software issue
Diagnostic Steps
1
Check transmission fluid level and condition — low fluid or burnt/dark fluid suggests internal problems.
2
Monitor live data during a road test focusing on RPM, vehicle speed, and gear state during the 5-6 shift event.
3
Command the 5-6 shift solenoid using bidirectional scan tool controls and verify proper operation by monitoring pressure changes.
4
Perform a line pressure test at the 5-6 shift circuit tap point to verify adequate hydraulic pressure.
5
If hydraulic pressure and solenoids test normal, internal transmission inspection is needed to evaluate the 5-6 clutch pack or band.
Estimated Repair Cost
$200 - $3,000
Parts + labor, varies by vehicle and location
The transmission is experiencing a 5-6 shift malfunction. The TCM has detected abnormal behavior during the shift between 5th and 6th gears, which may include harsh engagement, slipping, flare-up (RPM spike without speed increase), or failure to complete the shift. This can be caused by mechanical, ...
The most common cause of P0829 (5-6 Shift Malfunction) is: Worn or damaged 5-6 shift clutch pack or band
Typical repair costs for P0829 range from $200 to $3,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle may not shift into 6th gear or may exhibit harsh/slipping shifts at highway speeds. Continued driving with a slipping shift generates excessive heat and can cause progressive transmission damage. Limit highway driving and have the transmission inspected promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0829 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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