U066C
Lost Communication With Exhaust Heat Exchanger Bypass Valve Actuator B
U066C is an OBD-II diagnostic trouble code meaning: Lost Communication With Exhaust Heat Exchanger Bypass Valve Actuator B. Common causes: open or short circuit in valve circuit, solenoid valve malfunction. Estimated repair cost: $28–89.
Symptoms
- Check Engine light comes on
- Deterioration of interior heating in cold weather
- Increased fuel consumption
- Unstable engine operation when cold
Causes
- Open or short circuit in valve circuit
- Solenoid valve malfunction
- Problems with the connector or wiring harness
- Engine control unit malfunction
- Contact corrosion
How to Fix
- Check valve control circuit integrity
- Check the resistance and operation of the solenoid valve
- Inspect connectors and wiring harness for damage
- Clean contacts from corrosion
- Replace valve if necessary
Related codes
Error U066C by Vehicle Brand
FAQ
What does the U066C code mean?
U066C is an OBD-II diagnostic trouble code that indicates: Lost Communication With Exhaust Heat Exchanger Bypass Valve Actuator B
What causes a U066C error code?
The most common causes of U066C include: Open or short circuit in valve circuit; Solenoid valve malfunction; Problems with the connector or wiring harness; Engine control unit malfunction.
How do I fix a U066C diagnostic trouble code?
To fix U066C: Check valve control circuit integrity. Check the resistance and operation of the solenoid valve. Inspect connectors and wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U066C?
Yes, but get it checked soon
How much does it cost to fix U066C?
The estimated repair cost for U066C is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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