U0104
Lost Communication With Cruise Control Module
Network / communication
Generic OBD-II
Low
What it means
U0104 sets when other modules stop receiving data from the cruise control module over the network. It usually means cruise control is disabled until communication is restored; the rest of the car normally drives fine, since this module only manages the cruise/speed-control feature.
Low
Can I keep driving? Yes — the car drives normally; you just lose cruise control and may see a warning light until it's fixed.
Common symptoms
What you'll notice
- Cruise control won't engage or drops out
- Cruise or check-engine warning light on
- Cruise control module missing from a scan tool
- Sometimes a stored companion communication code
Common causes
Most likely first
- Blown fuse or lost power/ground to the cruise control moduleLikely
- Damaged or corroded wiring/connector at the moduleCommon
- CAN bus wiring fault to the moduleCommon
- Failed cruise control moduleLess often
- Low system voltage from a weak batteryLess often
How to diagnose & fix
Work through it in order
- Scan for other communication codes to see if the whole bus or just this module is affected.
- Check the fuse, power, and ground feeding the cruise control module.
- Inspect the module's connector and wiring for damage or corrosion.
- Verify the CAN bus wiring to the module has continuity and correct resistance.
- If power, ground, and bus are all good, suspect the module itself.
FAQ
Quick answers
Is it safe to drive with U0104?+
Yes. Only cruise control is affected; the car drives normally otherwise. Fix it when convenient.
Can I just clear U0104?+
You can, but it returns if the module still can't communicate. Repair the cause first, then clear and retest.
Related codes
Often seen with U0104
Read & clear U0104 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX