U0307Software Incompatibility With Glow Plug Control Module 1
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Glow plug control module 1 switches the glow plugs of a diesel and exchanges data with the engine controller, usually over LIN. U0307 means that the controller does not accept the module's software. Volkswagen's 2014 Touareg TDI specification book sets it when the software check carried out over the LIN message fails. Ford's diesel OBD summaries of 2015 and 2023 list U0307 among the network faults and trip it when the glow module reports that it has fallen back to a safe glow mode; Ford's 2014 code interpretation marks it as a MIL code. GM tells technicians to check and update the module software on 2017 6.6 L L5P trucks after any glow plug replacement (PIP5524). CARB requires glow plug function to be monitored. Expect hard cold starts, white smoke and a lit MIL. U0106 means lost contact, U0407 invalid data.
- What you may notice
- Long cranking or no start in cold weather
- White smoke and rough idle after a cold start
- MIL and glow plug warning lamp on
- Likely causes
- LikelyGlow plug module software outdated or not matching the engine controller
- PossibleReplacement glow module of another part number or engine variant fitted
- PossibleEngine controller updated or replaced without updating the glow module
- RareDisturbed LIN line corrupting the software check
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.