P26B1

Engine Coolant Bypass Valve A Stuck Closed

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Engine overheating
Reduced cooling system efficiency
Unstable engine operation
Hot air from the interior heating system
Check Engine Light Illuminates

Causes

Mechanical valve jamming
Valve actuator malfunction
Wiring problems
Valve contaminated or corroded
Engine control unit malfunction

How to Fix

Check the condition of the coolant bypass valve
Check the valve actuator
Check the integrity of wiring and connectors
Clean or replace valve
If necessary, replace the engine control unit

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