P0362 Ignition coil L primary/secondary circuit malfunction
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P0362 Ignition coil L primary/secondary circuit malfunction

22.09.2023 /

P0362 – OBD-II Trouble Code Technical Description

Ignition coil L, primary/secondary circuit malfunction

What does the fault code mean P0362?

This diagnostic trouble code (DTC) is a generic code for the ignition system that applies to OBD-II equipped vehicles. Although general, specific repair procedures may vary depending on the make and model of vehicle. Modern engines typically use a COP (coil on plug) ignition system with a separate coil for each cylinder, controlled by the PCM (engine control module). This eliminates the need for spark plug wires since the coil is placed above the spark plug. Each coil has two wires attached to it: one for battery power and the other for the control circuit controlled by the PCM.

Code P0362 may occur if an open or short is detected in the No. 12 coil control circuit. In addition, different vehicle models may have different modules that can detect and store this code, including the transmission control module, body control module, turbo control module, anti-theft module, anti-lock brake control module, and steering control module.

P0362 Ignition coil L primary/secondary circuit malfunction

Possible reasons

This diagnostic trouble code (DTC) is a generic code for the ignition system that applies to OBD-II equipped vehicles. Although general, specific repair procedures may vary depending on the make and model of vehicle. Modern engines typically use a COP (coil on plug) ignition system with a separate coil for each cylinder, controlled by the PCM (engine control module). This eliminates the need for spark plug wires since the coil is placed above the spark plug. Each coil has two wires attached to it: one for battery power and the other for the control circuit controlled by the PCM.

Code P0362 may occur if an open or short is detected in the No. 12 coil control circuit. In addition, different vehicle models may have different modules that can detect and store this code, including the transmission control module, body control module, turbo control module, anti-theft module, anti-lock brake control module, and steering control module.

What are the symptoms of a fault code? P0362?

Symptoms of a P0362 trouble code may include:

  1. Illuminated MIL (Malfunction Indicator Light), which may also be known as the Engine Maintenance Light.
  2. Lack or loss of vehicle power.
  3. Increased difficulty starting the engine.
  4. Fluctuations in engine operation.
  5. Rough engine idling.

The check engine light coming on can be one of the symptoms, but it doesn't always happen right away. Drivers may also notice decreased vehicle handling even if the indicator is not yet activated. The vehicle may have difficulty moving and poor acceleration performance. The engine may run unevenly even at idle.

How to diagnose a fault code P0362?

Is the engine currently misfiring? If not, then most likely the problem is intermittent. Try checking the wiring at coil #12 and along the wires to the PCM using the shaking method. If manipulation of the wiring causes misfire, the wiring problem must be repaired. It is also important to check the quality of the contacts in the coil connector and ensure that the wiring is not damaged or rubbing against other components. Carry out repairs if necessary.

If the engine is currently misfiring, stop the engine and disconnect the No. 12 coil wiring connector. Then start the engine and check for a control signal at the No. 12 coil. You can use a voltmeter to determine if there is a signal between 5 and 20 Hz, which indicates the driver is working. If the Hertz signal is present, replace the #12 ignition coil as it is likely bad. If there is no signal from the PCM to the ignition coil driver circuit, check the DC voltage at the ignition coil connector. If significant voltage is detected, look for a short circuit. If there is no voltage, disconnect the PCM connector and check the continuity of the driver circuit between the PCM and the coil. In case of a break or short to ground, make appropriate repairs. If the coil driver signal wire is not open or shorted to either voltage or ground, and no signal is being sent to the coil, there is likely a fault in the PCM coil driver. Remember that after replacing the PCM, it is recommended to re-diagnostics to ensure that there are no reoccurrences.

Mechanics diagnosing a P0608 code typically use an OBD-II scanner that is connected to the vehicle's on-board computer. This helps them get more information about the code and problems with the vehicle. They can also reset the code and check if it comes back. If the code reactivates, it often indicates there is a real problem. Code P0608, unlike others, can be related to the transmission control module itself. Therefore, it is important to conduct a thorough diagnosis to identify and eliminate the root of the problem.

Diagnostic errors

When the P0608 code appears, it is often accompanied by other trouble codes, such as engine misfire, fuel injector codes, and transmission-related codes, to name a few. In such cases, technicians usually focus on eliminating the causes of these additional codes without paying due attention to the P0608 code, which may have played a role in causing the remaining codes.

How serious is the fault code? P0362?

The P0608 code can be a serious problem because not only can it cause other problems with the vehicle, but it can also affect the vehicle's drivability until it is corrected. It is important to contact a service center immediately if you notice any problems or anomalies in the operation of your vehicle. In addition, regular diagnostics will help identify and address potential problems before they worsen.

What repair will help eliminate the code? P0362?

The following are repair options that can be applied when the P0608 code appears:

  1. Conduct a thorough wiring inspection to rule out shorts, breaks, corrosion, poor connections, and other electrical problems.
  2. If a faulty vehicle speed sensor is found, it is recommended to replace it.
  3. If the powertrain control module is found to be faulty, it may need to be replaced to correct the problem.
What is P0362 Engine Code [Quick Guide]

P0362 – Brand-specific information

Of course, here is a list of 6 car brands and what the P0362 code means for each of them:

Toyota:

Ford:

Chevrolet:

Sling:

BMW:

Volkswagen:

Note that the exact meaning of the P0362 code may vary slightly depending on the specific model and year of the vehicle, but it is usually associated with problems with the camshaft position sensor. For accurate diagnosis and repair, it is always recommended to consult the service documentation or specialists of the relevant manufacturer.

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