U009B

Vehicle Communication Bus I

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$6–167 (est.)

Symptoms

Check Engine light comes on
Incorrect operation of various vehicle systems
Lost communication with one or more modules
Reduced engine power
Gear shifting problems

Causes

Open or short circuit in the communication bus circuit
Poor contact in module connectors
Malfunction of one of the electronic modules
Interference in the electrical system
Software failures in modules

How to Fix

Check the integrity of the communication bus wiring
Inspect and clean all module connectors
Check power supply and grounding of modules
Read error codes from all modules
If necessary, replace the faulty module

Related codes

U0100 U0121 U0140