OBD Guide

U049D

Invalid Data Received From Glow Plug Control Module 2

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$39–167 (est.)

Symptoms

  • Difficulty starting the engine (especially in cold weather)
  • Check Engine Light on Dashboard
  • Reduced engine power
  • Floating idle speed
  • The engine may not start at all

Causes

  • Malfunction of glow plug control module 2
  • Open or short circuit in the communication circuit
  • Poor contact in module connectors
  • Problems with the module software
  • Wiring harness fault

How to Fix

  1. Check the connections and connectors of the glow plug control module
  2. Test the communication circuit for open and short circuit
  3. Read error codes from glow plug module
  4. If necessary, replace glow plug control module 2
  5. Update module software (if available)

Related codes

Error U049D by Vehicle Brand