P2306 OBD Error Code: Problem & Solutions

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The trouble code P2306 can be elucidated as Ignition Coil "C" Primary Control Circuit Low. This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially those made from 1996 up to present. It’s also more common among Audi, Citroen, Chevrolet, Ford, Hyundai, Nissan, Peugeot, and Volkswagen vehicles. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model, powertrain configuration type, to another.

Want to learn something more about the P2306 fault code? The error code indicates that there is an issue with the primary control circuit in ignition coil ‘C’, and potentially other ignition coils. The ignition coils are connected to the engine, and a small spark plug wire is used to ignite the engine. It is the powertrain control module which would control each coil electronically, which ensures that ignition occurs optimally. The battery voltage is sent to the ignition coil, which would trigger the ignition spark which leads to proper engine ignition timing.

What causes this problem with the Ignition Coil "C" Primary Control Circuit Low?

• There can be inoperative Ignition Coil 'C'
• There can be opened or shorted Ignition Coil 'C' harness
• Ignition Coil 'C' circuit inferior electrical connection
• Imperfect relay or blown fuse
• Quirks in the PCM
• Unusable camshaft or crankshaft sensor
• Defective wiring

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• Check engine light might come into signal
• Diminishing fuel efficiency
• Declining engine performance
• Appearance of other codes

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 ignition coil should be restored to working order
• Recondition the non-functioning ignition coil wiring
• The malfunctioning fuel injector should be repaired or replaced as per the need
• Carefully adjust the faults in the engine parts
• It is necessary to perform proper service of the unsound PCM
• You must fix the defective ignition coil connector
• It is essential to restore the flawed wiring
• Repair or replace the quirky camshaft or crankshaft sensor
• Rehabilitate the defaults in the spark plug

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

• The mechanic or the technician will use a diagnostic scanner or code reader like DVOM to visually scan for the error codes in the vehicle.
• 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 pin out 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 P2306.
• After that test drive the vehicle to see if the code P2306 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. Now if the code has been restored, then you must continue with the diagnosis.
• One should obtain connector face views, connector pin out charts, component locator charts, wiring diagrams, and diagnostic flow charts by utilizing your source of vehicle information.
• A visual inspection of associated wiring and connectors should be performed. Make sure to repair or restore the wiring that has been cut, burned, or flawed.
• Wiring on top of the engine is often defective due to wildlife attempting to stay warm in cold climates.
• The DVOM should be used to inspect the voltage and ground circuits at the ignition coil. If no voltage has been detected, then you should check the system relay and associated fuses.
• Restore the faulty relays or blown fuses as per the requirement.
• If voltage and ground have been detected at the coil, examine the corresponding ground circuit at the PCM connector with the engine running.
• If ground pulse is detected there, then there is an open circuit between the coil as well as the PCM.
• If no ground pulse is discovered there, then there is some fault in the PCM or there might be PCM programming error.

Common Mistakes When Diagnosing The P2306 Code

• Many a times the technicians would not realize and would just replace the ignition coils and spark plugs when in reality the wiring and connectors should be restored so that it can work properly.
• Make sure that you first of all check the other possible causes rather than just replacing the correct auto parts directly.