Electric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit Low
The motor supply voltage of the second auxiliary transmission fluid pump is below the operating range.
Affected components
- Aux trans pump b
- Supply circuit
- Battery
Common causes
- High likelihood: High-resistance battery feed
- Medium likelihood: Weak battery sags under pump current
- Low likelihood: Connector pins corroded - high contact resistance
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.