U0037

Vehicle Communication Bus B

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–56 (est.)

Symptoms

Incorrect operation of secondary systems (climate control, audio system)
Malfunction indicator light comes on
Intermittent electronic malfunctions
Lack of communication with some modules during diagnostics

Causes

Open or short circuit in Bus B bus circuit
Poor contact in connection connectors
Fault in one of the connected modules
Wiring harness damage
Software failure in one of the control units

How to Fix

Check continuity of Bus B wiring
Inspect and clean all connection connectors
Carry out diagnostics of connected modules
Check power and ground on problem modules
Update control unit software

Related codes

U0036 U0038 U0040