U0035

Vehicle Communication Bus A (-) High

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 electronic systems
Lost connection with some modules
Problems with diagnostics via OBD-II

Causes

Open or short circuit in the CAN-A High line
Poor contact in CAN bus connectors
Malfunction of one of the electronic modules
Wiring harness damage
Contact corrosion

How to Fix

Check the integrity of the CAN bus wires
Inspect connectors for oxidation or damage
Check the resistance of the CAN bus (should be about 60 ohms)
Disable the modules one by one to find the faulty one.
If necessary, replace damaged wires or connectors

Related codes

U0001 U0028 U0041