Motor Electronics Coolant Pump B Control Circuit High

Where it lives

For P0B3A, the circuit described runs through the pump. The description of P0B3A reports a fault at the pump.

Check these first

• A short to power in the coolant pump B control circuit
• High resistance in the pump B ground
• A failed motor electronics coolant pump B
• A control module holding the pump B circuit high

What to do next

1. Command coolant pump B off and read control circuit voltage
2. Check the pump B control circuit for a short to power
3. Measure resistance in the pump B ground
4. Measure the pump B motor resistance
5. Replace the control module if the circuit tests good
6. Clear the code and retest

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