P26AB

Engine Coolant Bypass Valve A Stuck/Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Incorrect engine temperature
Engine overheating
Increased fuel consumption
Unstable engine operation
Hot air from the stove even on the lowest setting

Causes

Mechanical valve jamming
Open or short circuit in wiring
Control module malfunction
Coolant valve dirty
Valve wear

How to Fix

Check the condition of the coolant bypass valve
Check wiring integrity and connections
Diagnose the valve control signal
Clean or replace valve if necessary
Check the cooling system for contamination

Related codes

P26AC P26AD P26AE