P06FBGlow Plug Control Module 2 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
- P06FB means glow plug control module 2 has found a memory checksum error – the counterpart of P06DF for module 1. The module forms a checksum over its memory at power-up and compares it with the stored value. For module 1, Ford's 2023 Power Stroke checks the RAM checksum at power-up (about 1 s); GM's L5P checks the ROM checksum (4.5 s, two trips) and reports it as P064C. No manufacturer document available to us uses a second glow module – Ford's and GM's V8 diesels drive all eight plugs from one; the code suits systems with one module per cylinder bank. The description follows module 1 (P06DF). The usual remedy is reprogramming or replacing the module. The plugs of module 2 then heat poorly or not at all, typically on one bank.
- What you may notice
- Check engine light, possibly glow plug/wait-to-start lamp
- Hard cold start, long cranking in frost
- Rough cold idle and white smoke, often one cylinder bank only
- Usually no symptoms when warm
- Likely causes
- LikelyGlow module 2 faulty internally (memory)
- PossibleInterrupted programming or faulty software
- RareVoltage dip at power-up
- 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.