What does code U0104 mean?

U0104 — Lost Communication With Cruise Control Module. Belongs to the network system. Severity: critical.

What are the common causes of U0104?

Faulty wiring or connector; Module power or ground fault; Faulty control module

Can I drive with code U0104?

Not recommended. Continued driving can damage the engine, transmission, or catalyst. Use a tow truck or take the shortest possible route to a workshop.

How do I diagnose U0104?

Read the code and freeze-frame with a scanner, check related-system errors, inspect the components listed (wiring, connectors, sensors). See the "How to diagnose" section above for the full step-by-step.

How do I clear code U0104?

The code can be cleared via an OBD-II scanner (e.g. ELM327 + the Car Diagnostics app): plug the adapter into the OBD port, go to Errors → Clear. If the underlying cause isn't fixed, the code will return within a few drive cycles.

OBD-II Code U0104 — Car Diagnostics Platform

What it means

Common causes

Faulty wiring or connector
Module power or ground fault
Faulty control module

How to diagnose

01
Read all stored and pending codes with an OBD-II adapter — get the full picture, not just the one code.
02
Capture freeze-frame data (RPM, coolant temperature, engine load) at the exact moment the code triggered.
03
Inspect the named subsystem with our app's AI explanation — get vehicle-specific causes for your make, model and year.

Decode U0104 on your actual car

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