Electric/Auxiliary Transmission Fluid Pump A Hydraulic Leakage
The TCM detects hydraulic leakage from auxiliary transmission fluid pump A. Pump output cannot maintain pressure due to internal or external leak.
Affected components
- Aux trans pump a
- Transmission fluid
Common causes
- High likelihood: Pump seal aged
- Medium likelihood: Internal pump wear
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.