U0028

Vehicle Communication Bus A

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–56 (est.)

Symptoms

Check Engine light comes on
Incorrect operation of various vehicle systems
Lost connection with some modules
Dashboard malfunctions
Problems with diagnostics via OBD-II

Causes

Broken or damaged CAN bus wires
Short circuit in CAN circuit
Fault in one of the connected modules
Poor contact in bus connectors
Problems with module power supply

How to Fix

Check the integrity of the CAN bus wiring
Inspect connectors and contacts for oxidation
Check power supply of all connected modules
Diagnose each connected module separately
If necessary, replace damaged wiring sections

Related codes

U0001 U0029 U0100