P06B8Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Non-volatile RAM keeps its content without power; among other things it stores the permanent fault codes CARB requires, which cannot be cleared with a scan tool. Ford sets P06B8 when the checksum of this permanent-code memory is wrong; a common companion is P068A (main relay dropped out too early, memory write incomplete). Ford's commercial and propane variants list it with or without the check engine light depending on the vehicle; Ford's 2023 diesel table misprints it as 'P068B'. GM and Saab do not use P06B8. Typical causes are interrupted shutdowns (battery disconnected, voltage dips), software faults and, rarely, a memory defect. After a software check, clearing and an ignition cycle with normal shutdown often resolve it.
- What you may notice
- Check engine light (depending on the vehicle)
- Often no driving symptoms
- Possibly P068A as well
- Likely causes
- LikelyInterrupted shutdown (battery disconnected, voltage dip, main relay too early)
- PossibleEngine module software
- PossibleWeak battery or poor ground
- RareMemory defect in the module
- 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: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.