OBD Guide

U0442

Invalid Data Received From ECM/PCM B

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–389 (est.)

Symptoms

  • Unstable engine operation
  • Power Loss
  • Check Engine Light Illuminates
  • Gear shifting problems
  • Decreased fuel efficiency

Causes

  • Damage to the wiring harness between modules
  • Corroded or oxidized connectors
  • ECM/PCM malfunction
  • Grounding problems
  • Control unit software error

How to Fix

  1. Check the integrity of the wiring between the modules
  2. Inspect connectors for corrosion
  3. Check ECM/PCM grounding
  4. Flash or replace the control unit
  5. Carry out CAN bus diagnostics

Related codes

Error U0442 by Vehicle Brand