P06B8: Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error

What it means

The control module has detected an error involving its non-volatile memory. The code alone does not establish whether the cause is a memory fault, software issue, or a power-supply problem.

At a glance

• Usually lights the check-engine light

How it works

The control module stores data it must retain when the ignition is off in non-volatile random access memory (NVRAM). P06B8 sets when the module's self-check detects an error with that memory, though unstable power or a software issue can also contribute.

Common causes

Most likely first.

1. Control-module memory or internal fault
2. Control-module software or calibration issue
3. Low or unstable module power or ground

Symptoms

• Check engine light on
• Possible limp mode or no-start
• Multiple follow-up faults across modules
• Reset/relearn may be needed after repair

How to diagnose it

1. Record freeze-frame data and scan all modules for communication, voltage, and internal-memory faults before clearing anything.
2. Check battery condition and charging performance, then inspect the control module's power and ground connections for corrosion, looseness, or damage.
3. Clear the code only after recording it, and check whether P06B8 returns immediately or after an ignition cycle.
4. Check vehicle-specific service information for an applicable control-module software or calibration update.
5. If supply and software checks are satisfactory and the code returns, have the module's NVRAM function tested and determine whether programming or module replacement is required.

Common fixes

• Repair a weak battery or charging fault that interrupts module power.
• Clean and secure the control module's power and ground connections.
• Apply an applicable software or calibration update using the required programming procedure.
• Replace or repair the control module if its memory failure is confirmed, then complete required programming and relearns.

Can I keep driving?

If the vehicle starts and runs normally, drive only as needed and watch for warning lights, stalling, or loss of starting ability. If it enters limp mode or will not start, avoid further trips because the module may lose stored operating data or control functions.