OBD-II code · Network
U063F Lost Communication With Engine Coolant Flow Control Valve Position Sensor
The vehicle bus reports loss of communication with smart engine coolant flow control valve position sensor. Closed-loop control of the flow valve loses its actual feedback.
Is it safe to drive with U063F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Coolant Flow Valve Position Sensor, Vehicle Bus Wiring
Related codes
- U063CLost Communication With Coolant Bypass Valve Actuator B
- U063DLost Communication With Hybrid/EV Electronics Coolant Pump A
- U063ELost Communication With Exhaust Heat Exchanger Bypass Valve Actuator A
- U0640Lost Communication With EVAP Fuel Vapor Temperature Sensor Circuit
- U0641Lost Communication With EVAP System Pressure Sensor/Switch Circuit A
- U0642Lost Communication With EVAP System Pressure Sensor/Switch Circuit B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.