P06DFGlow Plug Control Module 1 Memory Checksum Error
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- A diesel glow plug control module has its own microcontroller. On power-up it forms a checksum over its memory and compares it with the stored value; P06DF means they differ, so the module's program or data cannot be trusted. Ford's 2023 6.7 L and 3.0 L Power Stroke list P06DF among the glow module checks, run at power-up and flagged on a RAM checksum mismatch after about 1 s. GM's L5P performs the same check on ROM (4.5 s, two trips) but reports it as P064C. CARB treats the module as a 'smart device' whose internal faults need not be pinpointed, so this is extra diagnosis by the manufacturer. The usual remedy is reprogramming or replacing the module; until then preheating may be missing.
- What you may notice
- Check engine light, possibly glow plug/wait-to-start lamp
- Hard cold start, long cranking
- White smoke and knocking after cold start
- Often no symptoms when warm
- Likely causes
- LikelyGlow plug control module faulty internally (memory, controller)
- PossibleFailed or interrupted programming of the module
- RareVoltage dip or spike at power-up (weak battery, poor ground)
- RareMoisture or corrosion in module or connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.