What it means
The engine coolant bypass valve E reports a control circuit high condition. Coolant routing on this branch cannot be commanded reliably.
At a glance
- Usually lights the check-engine light
How it works
Coolant bypass valve E directs coolant through a branch of the cooling system when commanded by the control module. The module monitors the valve's circuit voltage while controlling it. This code sets when the circuit is higher than expected, which can happen if the wire is shorted to battery voltage or the actuator circuit is open.
Common causes
Most likely first.
- Wire shorted to B+
- Open valve actuator
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light may be on
- Engine may take longer to warm up or show unusual temperature behavior
How to diagnose it
- Record freeze-frame data and inspect related cooling-system codes to see what conditions accompanied the high-circuit fault.
- With the engine cool, inspect valve E's connector and wiring for corrosion, loose or backed-out terminals, and insulation damage that could expose a wire to battery voltage.
- Check whether the circuit remains high with valve E disconnected; this helps distinguish a harness fault from an actuator fault.
- Test the isolated control wire for a short to battery positive and check actuator continuity against the manufacturer's specification.
- If the harness and actuator test correctly, inspect the control-module connector and circuit path for poor contact or damage.
Common fixes
- Repair wiring shorted to battery positive in valve E's control circuit.
- Replace valve E if its actuator circuit is open.
- Repair corroded or loose terminals at the valve connector.
- Repair damaged wiring or connector pins found during circuit testing.
Can I keep driving?
If the temperature gauge is normal, keep any necessary drive short and monitor it closely. Avoid continued driving if temperature becomes abnormal; valve E may not route coolant as commanded, risking overheating or poor cabin heat.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.