P2AA8

Engine Coolant Bypass Valve B Position Sensor Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–44 (est.)

Symptoms

Unstable engine temperature
Overheat warning on dashboard
Reduced cooling system efficiency
The engine takes a long time to warm up or overheats

Causes

Valve position sensor B fault
Open or short circuit in the sensor circuit
Problems with the connecting wiring harness
Malfunction of the coolant valve itself

How to Fix

Check the condition of the sensor and its connection
Diagnose the sensor circuit
Replace valve position sensor B if necessary
Repair or replace damaged wires

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