OBD Guide

U0251

Lost Communication With Running Board Control Module B

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • The step does not work or does not work correctly
  • Check Engine light comes on
  • Errors in other vehicle systems
  • Problems with automatic door opening

Causes

  • Broken or damaged wiring
  • Step control module B malfunction
  • Module power problems
  • Contact corrosion
  • Problems with the CAN bus

How to Fix

  1. Check the integrity of the wiring to the module
  2. Check the power supply and ground of the module
  3. Inspect contacts for corrosion
  4. Check module functionality
  5. Scan the CAN bus for errors

Related codes

Error U0251 by Vehicle Brand