Error Code P06B8: What It Means & What To Do?

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Do you have that check engine light flashing? Experiencing fall in fuel economy? Appearance of various driveability issues? If you answer is YES, then chances are that you might end up with OBD error code P06B8 flashing on your vehicle. Wondering what this error code means? Worried? Don’t worry! You can have in depth understanding of this error code with the help of our subsequent sections.

OBD error code P06B8 will be set by your vehicle’s Powertrain Control Module, also known as the PCM when it loses communication with any of the other control modules of the vehicle. To know more about this error code, go through the following points.

What causes this problem with the Internal Control Module Non-Volatile Random-Access Memory?

• Faulty powertrain control module (PCM) or a PCM programming error
• Poor electrical circuit or connectors in the CAN harness
• Control module ground being short

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It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P06B8 here:

Common Symptoms

• There might occur various engine drivability symptoms
• Appearance of other diagnostic trouble codes

Here are some ways with the help of which you will be able to correct the OBD Code P06B8

• Replace or repair the damaged or problematic pcm programming
• Replace or repair the malfunctioning control modules
• Repair or replace all the related wirings and connectors, if found damaged or problematic

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Here are some steps which you should follow in order to diagnose this fault code:

• Firstly, in order to diagnose this error code P06B8 considering the fact that it involves the reprogramming issues and you will need the reprogramming equipment’s or else you won’t be able to repair this problem successfully. Now, before you attempt to diagnose and correct this error code P06B8, you will have to make sure that you rectify and fix all the ECM/PCM power supply codes that already exists. Before you make sure of this controller defective, you can attempt various preliminary tests via using a diagnostic scanner, a digital volt/ohmmeter and a reliable vehicle information.
• Secondly, you will need to connect the scanner to the diagnostic port of your vehicle and retrieve the stored codes. Clear the codes and conduct a test drive. If the code is reset, continue with this short list of preliminary tests. While diagnosing this error code P06B8, information and prior knowledge will be your greatest tool. Try to find the suitable technical support bulletin and If you find the right TSB, it may yield diagnostic information that will help you greatly. Now use this information to get connector face views, connector pinout charts, component locators, wiring diagrams, and diagnostic flow charts related to the code and vehicle in question.
• Thirdly, you will also need to check the controller power supply and in order to do so you will need the DVOM. If you come across any fuses or relays that are blown out, make sure to replace them (check the fuses when the circuit is loaded). In case all the relays and fuses are operating as desired, conduct a visual inspection of the related wires and harnesses. Also check the chassis and engine ground junctions. Use the TSB to ascertain the ground locations and check the ground integrity through DVOM. Check and visually inspect the system controller for any signs of heat or damage. If you come across any controller that is bad, you can consider it as defective.
• After this, if the controller power and ground circuits are unblemished, you can suspect a damaged controller or a controller programming blunder. You will need to undergo reprogramming for the controller replacement. Different vehicles/controllers will require on-board reconstructing that may just be done through a dealership or other qualified source.
• Lastly, make sure that unlike other codes, P06B8 code is likely caused by a faulty controller or a controller programming error. Also, check the system ground integrity by connecting the negative test lead of the DVOM to ground and the positive test lead to battery voltage.

Common Mistakes When Diagnosing the P06B8 Code

Common mistake that you are likely to commit while diagnosing this error code P06B8 is that of ignoring the following failures:

• Powertrain Control Module (PCM) failure
• Wiring issue