The Lemon IndexA data network the car's computers share has gone quiet.
Fix soon. Book a shop visit this week. Stop driving if the car slips, shakes, overheats or warns you.
Wiring fault. Then: failing module; weak battery or poor ground.
Owners named U0073 in 34 complaints to the U.S. government, most often on the Toyota Camry.
Cars owners report it on
Complaints that name U0073, by model. Raw counts, not a failure rate: popular models get more complaints.
Years owners report it on most: 2007 Toyota Camry · 2011 Chevrolet Equinox · 2023 GMC Sierra · 2024 Chevrolet Traverse
The details
What U0073 means
A data network the car's computers share has gone quiet.
Can I drive with U0073?
Fix soon. Book a shop visit this week. Stop driving if the car slips, shakes, overheats or warns you.
44% of the owner complaints that name U0073 also say the car brakes or ABS act up. A complaint can describe more than one problem, so this doesn't prove the code caused it.
Common causes of U0073
- Wiring fault
- Failing module
- Weak battery or poor ground
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Brakes or ABS act up: 44% of complaints
- Warning lights and electrical faults: 41% of complaints
- Loses power or goes into limp mode: 29% of complaints
- Stalls or shuts off: 21% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report U0073 most
2007 Toyota Camry (4), 2011 Chevrolet Equinox (2), 2023 GMC Sierra (2), 2024 Chevrolet Traverse (2).
Related codes
Quick answers
What does U0073 mean?
Control Module Communication Bus A Off. A data network the car's computers share has gone quiet.
Can I drive with U0073?
Fix soon. Book a shop visit this week. Stop driving if the car slips, shakes, overheats or warns you.
What causes U0073?
Wiring fault; Failing module; Weak battery or poor ground.
Counts: NHTSA owner complaints whose text names U0073. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.