OBD-II code · Network
U0118 Lost Communication with Cabin Air Quality Sensor Module
The Cabin Air Quality Sensor Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Automatic air-recirculation control loses its air-quality input. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
Is it safe to drive with U0118?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAir quality sensor unpowered
- PossibleCAN wiring to air quality sensor broken
- Less likelyGateway module routing CAN messages incorrectly
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
- Parts involved
- Air Quality Sensor Module, Can Bus Wiring
Related codes
- U0115Lost Communication with ECM/PCM "B"
- U0116Lost Communication with Steering Effort Control Module
- U0117Lost Communication with Drive Motor Control Module 2
- U0119Lost Communication with Steering Column Control Module
- U011ALost Communication With Exhaust Gas Sensor Module A
- U011BLost Communication With Rocker Arm Control Module A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.