P2B5D

Engine Coolant Flow Control Valve Position Sensor Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Incorrect engine temperature (overheating or underheating)
Increased fuel consumption
Reduced engine power
Check Engine Light Is On
Unstable engine operation at idle

Causes

Valve position sensor malfunction
Open or short circuit in the sensor circuit
Problems with the coolant flow control valve
Corrosion or poor contact in connectors
Malfunction of the engine control unit (rare)

How to Fix

Check the resistance of the position sensor
Check the integrity of the sensor circuit
Inspect connectors and contacts for corrosion
Check the operation of the coolant flow control valve
If necessary, replace the sensor or valve

Related codes

P2B5C P2B5E P0128