Motor Electronics Coolant Pump B Control Circuit Low

Where it lives

For P0B39, the circuit described runs through the pump. The description of P0B39 reports a fault at the pump.

Check these first

• A short to ground in the coolant pump B control circuit
• Low battery voltage at the pump B circuit
• A failed motor electronics coolant pump B
• Low coolant level

What to do next

1. Command coolant pump B on and read control circuit voltage
2. Check the pump B control circuit for a short to ground
3. Check the battery voltage
4. Check the coolant level
5. Replace pump B if the circuit tests good
6. Clear the code and retest

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