U049D

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