P26AC

Engine Coolant Bypass Valve B Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Engine overheating
The engine takes a long time to warm up
Unstable engine temperature
Check Engine Light Is On
Decrease in interior heater efficiency

Causes

Broken wires in the control circuit
Coolant bypass valve malfunction
Corrosion or poor contact in connectors
Problems with the control relay
Engine control unit (ECU) malfunction

How to Fix

Check the integrity of wires and connections in the control circuit
Test valve resistance and operation
Clean connector contacts from corrosion
Check the operation of the control relay
Replace the coolant bypass valve if necessary.

Related codes

P26A9 P26AB P26AD