What Does U0407 Mean?
The Engine Control Module (ECM) is receiving corrupted or implausible data from the Glow Plug Control Module over the vehicle communication network (CAN bus). This affects diesel engine cold start and performance monitoring.
Common Causes
35%
Faulty glow plug control module with internal circuit failure
30%
Corroded or damaged wiring/connectors between glow plug module and CAN bus
20%
CAN bus communication issues or network termination resistance problems
10%
Low battery voltage or poor ground connections affecting module operation
5%
Software corruption or ECM issue misinterpreting valid data
Diagnostic Steps
1
Step 1: Check battery voltage and ensure stable 12V+ supply; verify clean ground connections at glow plug module
2
Step 2: Inspect wiring harness and connectors for corrosion, damage, or moisture at glow plug control module
3
Step 3: Use scan tool to monitor live data from glow plug module and verify data values are within normal parameters
4
Step 4: Check CAN bus termination resistance (should be ~60 ohms between CAN-H and CAN-L with key off)
5
Step 5: Test glow plug control module by substitution if available, or check for software updates for ECM
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The Engine Control Module (ECM) is receiving corrupted or implausible data from the Glow Plug Control Module over the vehicle communication network (CAN bus). This affects diesel engine cold start and performance monitoring.
The most common cause of U0407 (Invalid Data Received From Glow Plug Control Module) is: Faulty glow plug control module with internal circuit failure
Typical repair costs for U0407 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause hard starting in cold weather and increased emissions. Vehicle remains drivable but cold-start performance will be degraded.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0407 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Network
System
Engine Starting/Glow Plug System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
