The Lemon IndexThe other computers in the car stopped hearing from the body control module.
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
Wiring or connector fault on the data network. Then: power or ground problem at the body control module; failed body control module.
Owners named U0140 in 37 complaints to the U.S. government, most often on the Mazda3.
Cars owners report it on
Complaints that name U0140, by model. Raw counts, not a failure rate: popular models get more complaints.
Years owners report it on most: 2010 Mazda3
The details
What U0140 means
The other computers in the car stopped hearing from the body control module. Features that depend on it can stop working, and several warning lights often come on together.
Can I drive with U0140?
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
43% of the owner complaints that name U0140 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 U0140
- Wiring or connector fault on the data network
- Power or ground problem at the body control module
- Failed body control module
- Weak battery
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Brakes or ABS act up: 43% of complaints
- Warning lights and electrical faults: 41% of complaints
- Stalls or shuts off: 22% of complaints
- Loses power or goes into limp mode: 14% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report U0140 most
2010 Mazda3 (2).
Related codes
U0141 U0146 U0131 U0151 U0155 U0129 U0159 U0126
Quick answers
What does U0140 mean?
Lost Communication With Body Control Module. The other computers in the car stopped hearing from the body control module. Features that depend on it can stop working, and several warning lights often come on together.
Can I drive with U0140?
Get it fixed soon. A few more days of normal driving is usually OK, but waiting can turn a small repair into a bigger one or a breakdown.
What causes U0140?
Wiring or connector fault on the data network; Power or ground problem at the body control module; Failed body control module; Weak battery.
Counts: NHTSA owner complaints whose text names U0140. 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.