Error Code P06C8: What It Means & What To Do?

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Fault code P06C8 can be defined as Cylinder 4 Glow Plug Incorrect.

The heat which is required to start the combustion during cold engine temperatures is provided by the glow plug system. The glow plugs are heated before and during cranking, as well as initial engine operation. The engine control module would control the glow plug ON times by monitoring coolant temperature and glow plug voltage.

There are has eight individual glow plug supply circuits in the glow plug system between the controller and the glow plugs. Now if the feedback voltage from the controller to the ECM would not be within the specified range, then the P06C8 trouble code would be set by the engine control module.

The Glow Plug is utilized on diesel engines to preheat the cylinder before the engine is started. Now if the engine control module would detect the glow plug for cylinder four is not functioning properly, then the P06C8 would start appearing.

What causes this problem with the Cylinder 4 Glow Plug Incorrect?

• Some defects in the glow plug connector
• Glow plug might be quirky
• Issue of opened or shorted glow plug control circuit
• Malfunctioning glow plug timer

1. Electronic Control Unit - A faulty Electronic Control Unit can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Powertrain Control Module - If everything is alright with Electronic Control Unit, then there is surely some defect in Powertrain Control Module. Get it replaced before the situation gets worse.
3. Glow Plug Connector - P06C8 code can display due to some faults in the Glow Plug Connector. So, it is very important to replace the Glow Plug Connector with us at equitable prices.
4. Engine Control Module - Do you remember when was the last time you got your car Engine Control Module checked up? A dirty Engine Control Module can cause a lot of issues like displaying P06C8 code.
5. Body Control Module Component - Poor Body Control Module Component can cause a lot of difficulties, so why not get it replaced at time?
6. Engine Wiring Harness - There can be some issues with the Engine Wiring Harness due to which you may see P06C8 code appearing over and over again. Visit us to buy best quality Engine Wiring Harness online.

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 P06C8 here:

Common Symptoms

• Extravagant black smoke from exhaust
• Engine misfire codes might be stored
• Engine drivability issues
• Starting the car engine can take some time
• The fuel efficiency can start decreasing

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• You can always replace the defective glow plug
• If there are some flaws in the glow plug timer, then it should be repaired or restored
• The glow plug control circuit might be opened or shorted, so you can get it repaired or replaced
• Restore the flawed glow plug connector

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

Make sure to use a diagnostic scanner, a reliable source of vehicle information, and a digital volt/ohmmeter (DVOM) will be required in order to arrive at an accurate diagnosis of a code P06C8. Use the vehicle information source to search for applicable technical service bulletins (TSB). If you locate a TSB that matches the vehicle make and model, symptoms exhibited, and the code stored, it will help you to arrive at a diagnosis.

You may also need to obtain diagnostic flow charts, wiring diagrams, connector face views, connector pinout charts, component locations, and component testing procedures/specifications from the vehicle information source. All this information will be needed to correctly diagnose the stored code P06C8.

Now once you have performed a careful visual inspection of all glow plug and glow plug control wiring and connectors, connect the diagnostic scanner to the vehicle diagnostic port. Then retrieve all stored codes and freeze frame data and record it for later. After that test drive the vehicle to see if the code P06C8 is reset. Drive until one of two things happens: Either the PCM enters readiness mode or the code is reset. If the code is reset, continue with the diagnosis. If it is not, you are dealing with an intermittent condition which may have to worsen before an accurate diagnosis may be achieved.

Here is a tip that the service manual will not give you. The best way to test glow plugs is to remove them and apply battery voltage. If the glow plug glows bright red, it is good. If the glow fails to heat up, and you want to take time to test it with your DVOM, you will likely discover that it does not meet manufacturer's specifications for resistance. Be careful not to burn yourself or start a fire when performing this test.

If the glow plugs appear to be working properly, use the scanner to activate the glow plug timer and test for battery voltage and a ground at the glow plug connector. If no voltage is present, test the power supply for the glow plug timer or glow plug controller. Test all related fuses and relays as recommended by the manufacturer. As a rule, it best to test system fuses and fusible links with the circuit loaded. The fuse for a circuit which is not loaded may appear to be functional (when it is not) and lead you down the wrong diagnostic path.

If all fuses and relays appear functional, use the DVOM to test output voltage at the glow plug timer or PCM (wherever it originates). If voltage is detected at the glow plug timer or PCM, suspect that you have an open or shorted circuit. You may seek out the cause of the discrepancy or simply replace the circuit.

Common Mistakes When Diagnosing The P06C8 Code

• Glow plug control module might be faulty
• There can be defective glow plug
• Malfunctioning glow plug wiring harness
• Many a times it is thought that a P06C8 cannot be caused by a defective glow plug because this is a control circuit code. Don't be deceived; a bad glow plug may cause a variation in the control circuit that results in just such a code
• Many mechanics make a big mistake of attempting to diagnose the wrong cylinder. Save yourself a big headache and make sure that you are addressing the correct cylinder before beginning your diagnosis.