P06B9 OBD Error Code: Problem & Solutions

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Is OBD code P06B9 flashing? Wondering what is P06B9 code? OBD code P06B9 relates to your vehicle’s glow plug circuit cylinder 1. This error code indicates that there is some performance related issues with your vehicle’s glow plug circuit. To know more about this error code, you will need to go through our following sections.

Most of the people confuses spark plugs and glow plugs, but they are two different parts with their own specific functions. A glow plug is there for each individual cylinder and is threaded into the cylinder head. Via the glow plug timer, also known as the glow plug controller the battery voltage is applied to the glow plug element. The purpose of this glow plug is to preheat the cylinders before the engine starts. Error code P06B9 will be flashed by the vehicle’s powertrain control module when it detects that the glow plugs for cylinder 1 malfunctioning.

What causes this problem with the Cylinder 1 Glow Plug Circuit Range/Performance?

• Damaged or defective glow plug for cylinder 1
• Electrical circuit issues with the glow plug for cylinder 1, such as being short or one
• Defective or too loose glow plug connectors
• Malfunctioning glow plug timer, also known as the glow plug controller

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It is vital 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 P06B9 here:

Common Symptoms

• Unusual black smoke emissions from the exhaust
• Occurrence of various drivability issues
• Delays in starting engine
• Fall in fuel economy
• Appearance of various engine misfire codes

Want to correct the Trouble Code P06B9? Read these points mentioned below:

• Replacing the damaged glow plug or plugs
• Replacing the damaged or open wirings and glow plug connectors
• Replacing the defective glow plug timer, also known as the glow plug controller

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P06B9 code to be stored:

You will need to start with a careful visual inspection to make sure which glow plug or glow plug wirings and connectors is damaged.

After that you will need to attach a diagnostic scanner to the diagnostic portal of your vehicle. Once you do that, make sure you retrieve all the previous codes, freeze the frame and conduct a road test to see what all codes reappear. Continue to drive until the PCM enters the code. In case the code does appear, continue with your diagnosis.

Now, if the code doesn’t appear then it is indicative of the fact that your vehicle is facing an intermittent condition which may have worsen before you undertook an accurate diagnosis.

Additional Tips

The best way to check the glow plugs is to remove them first and then apply the battery voltage. In case the glow plug turns bright red, consider it as a good sign. In case it fails to heat up, you will need to use the DVOM to test it further.

Common Mistakes When Diagnosing the P06B9 Code

While conducting the diagnosis do take care that you don’t end up burning yourself. Also keep the manufacturer’s specification booklet handy. In addition to that, take care of the following failures:

• Failing glow plug control module
• Failing glow plug
• Failing glow plug wiring harness