P2B5B

Engine Coolant Flow Control Valve Control Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Check Engine Light Is On
Engine overheating
Insufficient interior heating
Reduced engine power
Unstable engine operation at idle

Causes

Open or short circuit in valve control circuit
Coolant flow control valve malfunction
Problems with the wiring harness or connectors
Engine control unit (ECU) malfunction
Corrosion of contacts in the control circuit

How to Fix

Check valve control circuit integrity
Check the resistance and operation of the coolant flow control valve
Inspect the wiring harness and connectors for damage.
Check control circuit voltage
If necessary, replace the valve or repair the wiring

Related codes

P2B5A P2B5C P2B5D