P0E7F

Coolant Bypass Valve B Control Stuck/Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Engine overheating
Unstable engine operation at idle
Extended engine warm-up time
Check engine light comes on
Reduced cooling system efficiency

Causes

Coolant bypass valve stuck
Open or short circuit in valve control circuit
Solenoid valve malfunction
Problems with the ECU
Valve contaminated or corroded

How to Fix

Check the condition of the coolant bypass valve
Check the integrity of electrical wiring and connectors
Check the operation of the solenoid valve
Replace valve if necessary
Clean or replace dirty components

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