P26AF

Engine Coolant Bypass Valve B Stuck/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Unstable engine temperature
The engine is overheating
Long engine warm-up
Increased fuel consumption
Loss of engine power

Causes

Mechanical valve sticking
Valve contamination
Solenoid valve malfunction
Wiring problems
Engine control unit malfunction

How to Fix

Check valve operation manually
Clean or replace valve
Check solenoid valve and wiring
Check fuses and relays
Diagnose the engine control unit

Related codes

P26AE P26B0 P26B1