U0038

Vehicle Communication Bus B Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–56 (est.)

Symptoms

Incorrect operation of electronic systems
Check Engine Light Illuminates
Lost connection with some modules
Intermittent dashboard malfunctions

Causes

Open or short circuit in communication bus B
Fault in one of the modules connected to the bus
Poor contact in connectors
Interference in the electrical system
Wiring harness damage

How to Fix

Check continuity of communication bus B
Inspect connectors for corrosion or damage
Test modules connected to the bus
Check for interference in the electrical system
Replace damaged wires or connectors

Related codes

U0037 U0039 U0040