OBD-II code · Network
U016B Lost Communication With A/C Compressor Control Module
ECU lost CAN communication with the A/C compressor control module (electric A/C compressor on hybrids/EVs).
Is it safe to drive with U016B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule unpowered
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
- 1–5 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- AC Compressor Module, Can Bus
Related codes
- U0168Lost Communication with Vehicle Immobilizer Control Module
- U0169Lost Communication with Sun Roof Control Module
- U016ALost Communication With Global Positioning System Module
- U016CLost Communication With Fuel Pump Control Module B
- U016DLost Communication With Exhaust Gas Sensor Module B
- U0170Lost Communication with Restraints Front Sensor "B"
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.