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OBD Codes
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P2308 Ignition Coil C Secondary Circuit

OBD-II Trouble Code Technical Description

Article by
Stephen Darby
Stephen Darby
ASE Certified Technician

总裁俱乐部appIgnition Coil C Secondary Circuit

What does P2308 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). That may include but is not limited to vehicles from Jeep, Dodge, Mercedes-Benz, Chrysler, Ram, Porsche, etc. Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration. Anecdotally this code is most commonly found on Jeep and Dodge vehicles though.


 

If your vehicle has stored a code P2308, accompanied by a malfunction indicator lamp (MIL), it means that the powertrain control module (PCM) has detected an abnormal voltage condition in the secondary control circuit of the ignition coil designated with the letter C. Refer to a manufacturer specific guide to determine which is the "C" circuit for your particular application.

总裁俱乐部appPrimary circuits of the ignition coil are the wires which supply battery voltage to the coil. Voltage is delivered through fuses, relays, and various other sources. Secondary coil circuits include the high-energy ignition boot, spark plug boot, or spark plug wires which are responsible for transference of the high energy spark from the coil to the spark plug.

Typically, the ignition coil is supplied with battery voltage and ground. When the ground signal is interrupted (momentarily), the ignition coil emits a high voltage spark which also fires the spark plug. Spark plug operation is a necessary component in the internal combustion engine. If primary voltage to the ignition coil is insufficient, high-energy voltage emission will not occur and the engine cylinder will not produce horsepower.

Typical individual cylinder (coil-on-plug COP) ignition coils:
P2308 COP coil on plug ignition coils

What is the severity of this DTC?

When a P2308 is stored, the cause should be diagnosed as soon as possible. Symptoms which likely accompany these codes will usually demand immediate attention.

What are some of the symptoms of the code?

总裁俱乐部appSymptoms of a P2308 trouble code may include:

What are some of the common causes of the code?

Causes for this code may include:

What are some P2308 troubleshooting steps?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of reliable vehicle information in order to accurately diagnose a code P2308.

You may save yourself time and trouble by searching for technical service bulletins (TSB) that replicate the code stored, vehicle (year, make, model, and engine), and symptoms exhibited. This information may be found in your vehicle information source. If you find the right TSB, it could yield a speedy solution to your diagnosis.

总裁俱乐部appAfter you connect the scanner to the vehicle diagnostic port and retrieve all stored codes and pertinent freeze frame data, write the information down (in case the code proves to be an intermittent one). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, because the code is intermittent. The condition which caused the P2308 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, continue with the diagnosis.

You may obtain connector face views, connector pinout charts, component locator charts, wiring diagrams, and diagnostic flow charts (pertaining to the code and vehicle in question) using your source of vehicle information.

Perform a visual inspection of related wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged. Scheduled maintenance includes the replacement of spark plug wires and boots. If the vehicle in question is beyond the recommended maintenance interval for a tune up, suspect bad spark plug wires/boots as the cause of a stored P2308.

Spark plug boots that are torn, burnt, or contaminated by fluid should be considered defective. Gain access to the junction between the ignition coil and the spark plug wire. Check for high energy ignition (HEI) at the spark plug. If none is detected, disconnect the spark plug wire from the coil and see if any HEI is found there. If there is HEI at the spark plug, suspect that the plug is defective or there is a PCM error. If there is no HEI at the spark plug but it is strong at the coil, suspect a bad plug wire or boot. If there is no HEI at the coil, suspect that the coil is defective. HEI should be tested (carefully) with the engine running.

Related DTC Discussions

Need more help with a P2308 code?

If you still need help regarding the P2308 trouble code, please post your question in our FREE car repair forums.

总裁俱乐部appNOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected.

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