OBD-II code · Network
U049D Invalid Data Received From Glow Plug Control Module 2
A receiving module detected implausible data from glow plug control module 2. Plug current/voltage or temperature values fail plausibility checks and are rejected; cold-start strategy reverts to fail-safe.
Is it safe to drive with U049D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule internal fault or sensor input drift
- PossibleSoftware version mismatch after replacement
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Glow Plug Module 2
Related codes
- U049AInvalid Data Received From Door Control Module A
- U049BInvalid Data Received From Tachograph Module
- U049CInvalid Data Received From Battery Charger Control Module A
- U049EInvalid Data Received From Direct Ozone Reduction Catalyst Temperature Sensor
- U049FInvalid Data Received From Transmission Range Control Module
- U04A0Invalid Data Received From Engine Coolant Pump Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.