P06C5 OBD Error Code: Problem & Solutions

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Fault code P06C5 can be defined as Cylinder 1 Glow Plug Incorrect. A glow plug for each individual cylinder is threaded into the cylinder head. Battery voltage is applied to the glow plug element via a glow plug timer (sometimes called a glow plug controller or glow plug module) and/or the PCM. If the voltage is properly supplied to the glow plug, it will literally glow red hot and aid in increasing cylinder temperature. If the cylinder temperature would reach the desired level, voltage is restricted by the control unit and the glow plug returns to its normal state.

 

If the PCM detects a level of voltage, for the cylinder #1 glow plug control circuit that is outside the expected range, a code P06C5 will start triggering up and there would be an illumination of the check engine light on the dashboard.

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

 

This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

 

What causes this problem with the Cylinder 1 Glow Plug Incorrect?

 

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

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4. Engine Control Module - Engine Control Module is an important car part which should never be neglected. May be there is some fault in it due to which P06C5 code may start flashing.
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We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P06C5. They are mentioned here as follows:

 

Common Symptoms

 

• Diminishing fuel efficiency
• Immoderate black smoke from exhaust
• Engine drivability issues
• Slow down engine start up
• Some engine misfire codes may be stored

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P06C5:

 

• If there are a few defects in the glow plug then it should be replaced
• Restore the opened or shorted glow plug control circuit
• The glow plug connector might be loose or faulty. So, you must get it repaired or replaced
• Carefully inspect the glow plug timer

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Do you wish to diagnose P06C5 error code easily? Here are some steps which you should follow in order to diagnose this fault code:

 

• The first and the foremost step which you have to perform while diagnosing the P06C5 error code is to record the freeze frame data and the present diagnostic trouble codes
• A diagnostic scanner, a reliable source of vehicle information, and a digital volt/ohmmeter will be required in order to arrive at an accurate diagnosis of a code P06C5
• 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 P06C5
• 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 P06C5 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 P06C5 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 P06C5 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