P068D OBD Error Code: Problem & Solutions

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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 P068D trouble code would be set by the engine control module.

P068D trouble code can be defined as Cylinder 7 Glow Plug Control Circuit High.

Do you want to learn more about P068D error code? This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

What causes this problem with the Cylinder 7 Glow Plug Control Circuit High?

• Defaults in the glow plug connector
• Some flaws in the glow plug timer
• Defective glow plug
• The glow plug control circuit might be opened or shorted

1. Powertrain Control Module - A faulty Powertrain Control Module can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Engine Wiring Harness - If everything is alright with Powertrain Control Module, then there is surely some defect in Engine Wiring Harness. Get it replaced before the situation gets worse.
3. Glow Plug Connector - P068D code can display due to some issues in the Glow Plug Connector. So, it is very important to replace the Glow Plug Connector with us at equitable prices.
4. Electronic Control Unit - Do you remember when was the last time you got your car Electronic Control Unit checked up? A dirty Electronic Control Unit can cause a lot of issues like displaying P068D 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 Control Module - Are there some faults in your Engine Control Module? Don’t waste time and get them replaced or else P068D code can turn up.

There could be countless symptoms which that would accompany with this fault code. Willing to know some common symptoms of OBD Trouble Code P068D? Your wish is our demand. Have a look at them below:

Common Symptoms

• Some issues related to engine drivability
• Engine start up can start delaying
• Reduction in the overall fuel efficiency
• Intemperate black smoke from exhaust
• Engine misfire codes may be stored

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:

• Make sure to repair or replace the opened or shorted glow plug control circuit
• It is essential to replace the glow plug connector
• Replace the quirky glow plug
• The faulty glow plug timer should be restored

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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 P068D code to be stored:

• It is important to conduct a proper diagnosis before doing any repairs of the vehicle. 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 P068D
• 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 P068D
• 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 P068D 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 P068D Code

• Failure in the glow plug wiring harness
• Many a times it is thought that a P068D 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
• A lot of people 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
• Glow plug control module might start failing
• Some faults in the glow plug