U0615

Lost Communication With Engine Coolant Bypass Valve A

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine light comes on
Incorrect operation of the cooling system
Increased engine temperature
Changing engine performance
Floating idle speed

Causes

Broken or damaged wires in the valve circuit
Poor contact in valve or ECU connectors
Coolant bypass valve malfunction
Problems with power or grounding of the circuit
Malfunction of the electronic control unit (ECU)

How to Fix

Check the integrity of wires and connectors in the valve circuit
Perform a visual inspection of the valve for damage.
Check valve resistance (compare with specifications)
Test power and grounding in the circuit
Replace the coolant bypass valve if necessary.

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