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U0615: Lost Communication With Engine Coolant Bypass Valve A

What Does U0615 Mean?

U0615 is a diagnostic trouble code indicating: Lost Communication With Engine Coolant Bypass Valve A. This code relates to the vehicle systems system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

What To Do Next

  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

U0610 Lost Communication With Mass or Volume Air Flow Sensor B U0611 Lost Communication With Intake Air Temperature Sensor 1 Bank 1 U0612 Lost Communication With Intake Air Temperature Sensor 1 Bank 2 U0613 Lost Communication With Intake Air Temperature Sensor 2 Bank 1 U0614 Lost Communication With Intake Air Temperature Sensor 2 Bank 2 U0616 Lost Communication With Engine Coolant Bypass Valve B U0617 Lost Communication With Engine Coolant Bypass Valve C U0618 Lost Communication With Engine Coolant Bypass Valve D