OBD Guide

U0443

Invalid Data Received From Body Control Module B

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Incorrect operation of comfort systems (lighting, power windows)
  • Malfunction indicator light comes on
  • Problems with central locking
  • Intermittent operation of electrical equipment
  • Errors in other vehicle systems

Causes

  • Problems with the CAN bus (open or short circuit)
  • Body control module B malfunction
  • Poor contact in module connectors
  • Wiring harness damage
  • Software error in the module

How to Fix

  1. Check connections and connectors of the BCM-B module
  2. Conduct diagnostics of the CAN bus for breaks and short circuits
  3. Read error codes from BCM-B module
  4. If necessary, update the module software
  5. Replace the BCM-B module if a malfunction is detected

Related codes

Error U0443 by Vehicle Brand