P06FB code meaning
Glow Plug Control Module 2 Memory Checksum Error
Powertrain system Generic code P06xx codes Check engine light
What P06FB means
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.
P06FB at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P06FB
- 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
Common causes of P06FB
- Most likelyGlow module 2 faulty internally (memory)
- PossibleInterrupted programming or faulty software
- Less likelyVoltage dip at power-up
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Glow plug control module 2
What each part of P06FB means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| FB | The exact fault in that area. |
What to do next
- Note P06FB and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P06FB
What does P06FB mean?
P06FB means "Glow Plug Control Module 2 Memory Checksum Error". P06FB means glow plug control module 2 has found a memory checksum error – the counterpart of P06DF for module 1. It is a generic code, so it means the same on every make.
Is it safe to drive with P06FB?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P06FB fail an emissions test?
Yes, it can. P06FB is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P06FB to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P06FB clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.