P0E80
Coolant Bypass Valve B Control Stuck Closed
Generic OBD-II
Common symptoms
What you'll notice
- Check and replace the coolant bypass valve if it is faulty or stuck closed.
- Inspect the wiring and connections associated with the coolant bypass valve and repair or replace if necessary.
- Perform a cooling system flush and refill to ensure proper coolant flow.
Common causes
Most likely first
- Faulty coolant bypass valve
- Failed coolant temperature sensor
- Blocked coolant passage
- Wiring or connection issues
How to diagnose & fix
Work through it in order
- Reduced performance or power
- Warning light illuminates
Read & clear P0E80 yourself
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