Engine Coolant Bypass Valve B Control Circuit/Open

Where it lives

For P26AC, the circuit described runs through the valve. The description of P26AC reports the valve as open.

Check these first

• An open in the engine coolant bypass valve B control circuit
• A short to ground or voltage on the engine coolant bypass valve B control wire
• A failed engine coolant bypass valve B
• A corroded or backed out pin at the engine coolant bypass valve B connector

What to do next

1. Read engine coolant bypass valve B status on a scan tool
2. Command engine coolant bypass valve B on and off
3. Test the engine coolant bypass valve B control circuit for open and short faults
4. Check the engine coolant bypass valve B connector pins
5. Replace engine coolant bypass valve B if the circuit tests good
6. Clear the code and retest

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