OBD-II code · Network
U0605 Lost Communication With A/C Refrigerant Sensor A
The vehicle bus reports loss of communication with smart A/C refrigerant sensor A. Pressure or composition feedback for the refrigeration loop is unavailable; A/C may default to off.
Is it safe to drive with U0605?
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
- 0.5–2 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- AC Refrigerant Sensor A, Vehicle Bus Wiring
Related codes
- U0602Lost Communication With Particulate Filter Pressure Sensor B
- U0603Lost Communication With Fuel Pressure Sensor A
- U0604Lost Communication With Fuel Pressure Sensor B
- U0606Lost Communication With Throttle/Pedal Position Sensor/Switch A
- U0607Lost Communication With Throttle/Pedal Position Sensor/Switch B
- U0608Lost Communication With Throttle/Pedal Position Sensor/Switch C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.