U0143

Lost Communication With Body Control Module C

Q: Is it safe to drive with U0143?

Usually — the engine and brakes aren't affected, but body features like lighting and locks may misbehave, which can be a safety concern at night, so get it diagnosed soon.

Q: Can I just clear U0143?

Clearing it is temporary; if the module or its wiring is at fault the code and the misbehaving features return until it's repaired.

Network / communication Generic OBD-II Medium

What it means

U0143 means another controller has lost communication with body control module C — one of the modules that manages body electrical functions like lighting, locks, wipers, and interior features. When it drops off the network, those features misbehave and warning messages appear, though the engine and brakes keep working. It is usually caused by a wiring or connector fault, a lost power or ground feed, or a failed module.

Medium

Can I keep driving? Usually yes — the engine runs, but body functions handled by this module (lighting, locks, wipers, interior features) may act up, so have it checked soon.

Real-world scan data

Seen in

121

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of U0143 scans

B1A28in 69.4% of scans

B1322in 64.5% of scans

U0165in 61.2% of scans

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

Body features glitchy or dead — lighting, locks, wipers, windows, or interior controls
Multiple warning lights or messages on the dash
The body control module unresponsive to a scan tool
Intermittent electrical faults that come and go

Common causes

Most likely first

Damaged, corroded, or disconnected wiring or connector at the body control moduleLikely
Lost power or ground feed to the moduleCommon
CAN bus fault between this module and the rest of the networkCommon
Failed body control moduleLess often
Water intrusion at the module or its connectorsLess often

How to diagnose & fix

Work through it in order

Scan all modules and confirm whether body control module C responds at all.
Check power, grounds, and fuses feeding the body control module.
Inspect the module's connectors and CAN wiring for corrosion, damage, or water intrusion.
Check the bus circuits between the module and the gateway for opens or shorts.
If power and wiring are good but the module stays silent, replace or reprogram it, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with U0143?+

Usually — the engine and brakes aren't affected, but body features like lighting and locks may misbehave, which can be a safety concern at night, so get it diagnosed soon.

Can I just clear U0143?+

Clearing it is temporary; if the module or its wiring is at fault the code and the misbehaving features return until it's repaired.

Read & clear U0143 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