P06B8 code meaning
Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error
Powertrain system Generic code P06xx codes Check engine light
What P06B8 means
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.
P06B8 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P06B8
- Check engine light (depending on the vehicle)
- Often no driving symptoms
- Possibly P068A as well
Common causes of P06B8
- Most likelyInterrupted shutdown (battery disconnected, voltage dip, main relay too early)
- PossibleEngine module software
- PossibleWeak battery or poor ground
- Less likelyMemory defect in the module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine control moduleControl module power supply
What each part of P06B8 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. |
| B8 | The exact fault in that area. |
What to do next
- Note P06B8 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 P06B8
What does P06B8 mean?
P06B8 means "Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P06B8?
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 P06B8 fail an emissions test?
Yes, it can. P06B8 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 P06B8 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will P06B8 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.