Electric/Auxiliary Transmission Fluid Pump B Driver Circuit Performance
The driver stage for the second auxiliary transmission fluid pump does not respond to commands within tolerance.
Affected components
- Aux trans pump b driver
- Control module
Common causes
- Medium likelihood: Aged driver shows degraded switching behaviour
- Medium likelihood: Current feedback loop noisy
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
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.