U0104

Lost Communication With Cruise Control Module

Q: Is it safe to drive with U0104?

Yes. Only cruise control is affected; the car drives normally otherwise. Fix it when convenient.

Q: 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.

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.

Real-world scan data

Seen in

172

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear U0104 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX