Motor Electronics Coolant Pump B Control Performance

Where it lives

For P0C74, start at the pump the description names.

Check these first

• A failed motor electronics coolant pump B
• A fault in the pump B control module
• An open or short in the pump B control wiring
• Corroded pins at the pump B connector
• Low coolant level or degraded coolant

What to do next

1. Check the coolant level and condition
2. Read pump B speed on a scan tool
3. Command pump B on and watch for coolant flow
4. Inspect the pump B connector and control wiring
5. Replace pump B or its control module if faulty
6. Clear the code and retest

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