OBD-II code · Network
U0104 Lost Communication with Cruise Control Module
The Cruise Control Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Cruise control and speed-hold functions stop working. 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 U0104?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyCruise module unpowered
- PossibleCAN wiring to cruise module 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
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Cruise Control Module, Can Bus Wiring
Related codes
- U0101Lost Communication with TCM
- U0102Lost Communication with Transfer Case Control Module
- U0103Lost Communication with Gear Shift Module
- U0105Lost Communication with Fuel Injector Control Module
- U0106Lost Communication with Glow Plug Control Module
- U0107Lost Communication with Throttle Actuator Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.