P26A9

Engine Coolant Bypass Valve A Position Sensor Stop/Minimum Stop Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–50 (est.)

Symptoms

Unstable engine temperature
Engine overheating
Floating idle speed
The overheat warning light comes on
Reduced engine power

Causes

Faulty valve position sensor
Open or short circuit in wiring
Mechanical failure of the bypass valve
Problems with the engine control module
Sensor contact corrosion

How to Fix

Check the sensor wiring for opens and shorts
Check the mechanical operation of the valve
Replace position sensor if necessary
Diagnose the engine control module
Clean sensor contacts and connectors

Related codes

P26AA P26AB P26A8