What Does U0307 Mean?
The Glow Plug Control Module software is incompatible with other diesel engine control modules. This indicates mismatched software versions between the glow plug controller and the diesel engine management system.
Common Causes
35%
Glow plug control module replaced without proper programming or calibration
30%
ECM updated without corresponding glow plug module software update
20%
Incorrect module version for engine type or emissions system configuration
15%
Incomplete or interrupted flash programming on glow plug system
Diagnostic Steps
1
Step 1: Verify glow plug module part number and software version match engine specifications
2
Step 2: Check calibration levels on glow plug module and ECM using diesel-specific diagnostics
3
Step 3: Review TSBs for glow plug system software compatibility with ECM version
4
Step 4: Reprogram glow plug control module and ECM to matching compatible software
5
Step 5: Test glow plug operation cycle times and verify proper cold start function
Estimated Repair Cost
$150 - $400
Parts + labor, varies by vehicle and location
The Glow Plug Control Module software is incompatible with other diesel engine control modules. This indicates mismatched software versions between the glow plug controller and the diesel engine management system.
The most common cause of U0307 (Software Incompatibility with Glow Plug Control Module) is: Glow plug control module replaced without proper programming or calibration
Typical repair costs for U0307 range from $150 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine may have hard starting or no-start condition in cold weather. Excessive white smoke during cold starts may occur.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0307 to identify the root cause.
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Quick Info
Category
Network
System
Diesel Cold Start System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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