U0043

Vehicle Communication Bus B (-) Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine light comes on
Malfunction of vehicle electronic systems
Problems with diagnostics via OBD-II
Unstable operation of the dashboard

Causes

Broken or damaged communication bus wires
Short circuit in the communication bus circuit
Malfunction of one of the electronic modules
Poor contact in communication bus connectors
Problems with power supply of electronic modules

How to Fix

Check the integrity of the communication bus wires
Check connections and connectors of the communication bus
Diagnose electronic modules for faults
Check power supply of electronic modules
Repair only from an authorized dealer

Related codes

U0041 U0042 U0044