Electric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit / Open
The motor supply line of the second electric or auxiliary transmission fluid pump is open. Pump cannot run, hydraulic pressure is lost during stop-start engine-off events.
Affected components
- Aux trans pump b
- Supply circuit
- Wiring harness
Common causes
- High likelihood: Blown fuse on supply line
- Medium likelihood: Broken supply wire
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
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.