OBD Guide

U0053

Vehicle Communication Bus C (-) High

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Check Engine Light Is On
  • Incorrect operation of various vehicle systems
  • Lack of communication with some modules during diagnostics
  • Problems starting the engine
  • Dashboard malfunctions

Causes

  • Open or short circuit in CAN-C bus wiring
  • Fault in one of the modules connected to the bus
  • Problems with module power supply
  • Corrosion or poor contact in connectors
  • Damage to CAN bus terminators

How to Fix

  1. Check the integrity of the CAN-C bus wiring
  2. Check voltage and resistance on the bus
  3. Disable the modules one by one to find the faulty one.
  4. Check power supply and grounding of modules
  5. Check the condition of connectors and contacts

Related codes

Error U0053 by Vehicle Brand