Error Code P06C4: What It Means & What To Do?

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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.

 

Error code P06C4 can be defined as Cylinder 12 Glow Plug Circuit Range/Performance.

If the error code P06C4 is appearing, then it would mean that the powertrain control module (PCM) has detected a discrepancy in the glow plug control circuit for cylinder #12. You can always consult a source of reliable vehicle information to determine the location of the #12 cylinder for your year / make / model / powertrain configuration.

 

What causes this problem with the Cylinder 12 Glow Plug Circuit Range/Performance?

 

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

1. Engine Control Module - There can be some issues with the Engine Control Module due to which you may see P06C4 code appearing over and over again. Visit us to buy best quality Engine Control Module online.
2. Glow Plug Connector - A lot of issues can arise do to defective Glow Plug Connector. Did you just see P06C4 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Electronic Control Unit - Faulty Electronic Control Unit can be the reason why P06C4 code is flashing. Visit us to purchase top notch Electronic Control Unit online.
4. Body Control Module Component - It is an important auto part which needs full care. A faulty Body Control Module Component can be a reason behind the flashing up of P06C4 code.
5. Engine Wiring Harness - OBD Code P06C4 can appear because of faulty Engine Wiring Harness.
6. Powertrain Control Module - P06C4 error code also relates to problems with the powertrain control module. Find all the Powertrain related parts with us.

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 P06C4 here:

 

Common Symptoms

 

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

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

 

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

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P06C4 can be a simple code to diagnose when all diagnostic steps are followed in the proper order and all tests are performed.

 

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 P06C4. 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 P06C4.

 

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 P06C4 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 P06C4 Code

 

• Glow plug control module might start failing
• Some faults in the glow plug
• Failure in the glow plug wiring harness
• Many a times it is thought that a P06C4 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