OBD Guide

U0065

Vehicle Communication Bus E Performance

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–167 (est.)

Symptoms

  • The Check Engine light comes on
  • Incorrect operation of various vehicle systems
  • Lost connection with diagnostic equipment
  • Dashboard malfunctions

Causes

  • Broken or damaged CAN bus wires
  • Corrosion or oxidation of contacts in connectors
  • Malfunction of one of the vehicle's electronic modules
  • Problems with power supply of electronic modules
  • Software failures in modules

How to Fix

  1. Check the integrity of the CAN bus wiring
  2. Inspect and clean the contacts in the CAN bus connectors
  3. Check power supply and grounding of electronic modules
  4. Carry out diagnostics of all modules connected to the CAN bus

Related codes

Error U0065 by Vehicle Brand