What it means
The engine coolant bypass valve E reports a stuck closed 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 controls flow through a branch of the engine's cooling circuit. The control module monitors whether the valve opens when commanded. This code sets when valve E remains closed, which may restrict coolant flow through that branch because the valve is jammed or debris prevents movement.
Common causes
Most likely first.
- Valve stuck in closed position
- Debris jammed in valve
- Carbon or debris buildup preventing free movement
Symptoms
- Check-engine light may be on
- Engine may overheat or show abnormal temperature
- Cabin heat may be reduced
How to diagnose it
- Save freeze-frame data and watch live engine temperature; stop testing if the engine is overheating.
- With the engine cool, inspect valve E's connector and wiring for damage that could prevent the valve from receiving a command.
- Use a scan tool's actuator test, if available, to command valve E and observe position feedback or the coolant-temperature response.
- Check the valve and accessible linkage for debris or binding that could hold it closed, following the manufacturer's service procedure.
- If the circuit receives the command but the valve does not move, inspect the valve internally for debris buildup or mechanical failure.
Common fixes
- Remove debris that is jamming valve E if the manufacturer's procedure allows cleaning.
- Repair wiring or connector faults preventing valve E from opening.
- Replace valve E if it remains stuck closed or cannot be freed safely.
- Refill and bleed the cooling system as specified if valve removal or repair disturbed coolant.
Can I keep driving?
Do not continue driving if the engine temperature rises above normal or a temperature warning appears; stop safely and shut the engine off. A closed valve E can restrict coolant routing and lead to overheating and engine damage.
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.