OBD Guide

U0032

Vehicle Communication Bus A (+) High

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • Unstable engine operation
  • Lack of communication with some modules
  • Check Engine light comes on
  • Transmission problems
  • Lost connection with diagnostic equipment

Causes

  • Short circuit in the CAN bus circuit
  • Malfunction of one of the electronic control units
  • Damage to wiring or connectors
  • Problems with contacts in CAN bus connectors
  • Malfunction of the transmission control unit

How to Fix

  1. Check the integrity of the CAN bus wiring
  2. Check contacts in bus connectors
  3. Test the bus voltage with a multimeter
  4. Disable the modules one by one to find the faulty one.
  5. Check module grounding

Related codes

Error U0032 by Vehicle Brand