Skip the auto shop - Our mechanics make house calls

P0362 OBD-II Trouble Code: Ignition Coil L Primary/Secondary Circuit Malfunction

check engine light

P0362 code definition

The P0362 code means that the PCM has registered a fault in either the primary or the secondary circuit of one or more ignition coils; this fault specifically pertains to the electrical circuitry that allows the individual coils to communicate with and be controlled by the PCM.

What the P0362 code means

The ignition system in a vehicle uses ignition coils in each cylinder. The ECM controls the ignition coils, causing them to work with the spark plug to create a spark for ignition. If the ignition coils do not respond to an on or off command, the ECM alerts the PCM to store the P0362 code.

What causes the P0362 code?

Most often, the P0362 code is caused by a faulty ignition coil. However, there may be other causes, including:

  • Shorted or open electrical wiring between the ignition coil driver circuit and the PCM.
  • Corroded or faulty connector for the ignition coil.
  • Open or shorted ignition coil harness.
  • In rare cases, a faulty PCM or ECM.

What are the symptoms of the P0362 code?

Some of the symptoms of the P0362 code may include engine misfire, choppy acceleration, and decreased engine performance. The Check Engine Light will be on, and there may be other codes stored in the PCM related to the injector circuit or the cylinder where the malfunctioning coil is located. It’s possible that the fuel injector may be totally disabled in the affected cylinder.

How does a mechanic diagnose the P0362 code?

After an OBD-II scanner verifies the P0362 code, a technician should inspect of all the wiring, connectors, and other electrical components, looking for damage, corrosion, loose connections, or other faults. Any damaged elements should be replaced, reconnected, or repaired. The mechanic should then clear the code and retest the system. If the code returns, the mechanic will then move on to other possible repairs.

Common mistakes when diagnosing the P0362 code

In many cases, the symptoms that can manifest with the P0362 code lead technicians to believe that the vehicle needs a simple tune up, and do not perform a thorough diagnosis of the issue. Tune ups only address the symptoms, and may not prevent the issue from returning.

How serious is the P0362 code?

If an OBD-II scanner has detected the P0362 code, it indicates a serious problem that should be addressed right away. If left unrepaired, this code could indicate a malfunction that will eventually lead to engine failure.

What repairs can fix the P0362 code?

In order to fix the issue causing the P0362 code, a mechanic will likely go through a standard set of repairs. They include:

  • Replacing a faulty coil.
  • Repairing or replacing shorted or open electrical wiring between the ignition coil driver circuit and the PCM/
  • Replacing a corroded or faulty connector for the ignition coil.
  • Replacing an open or shorted ignition coil harness.
  • In rare cases, replacing a faulty PCM or ECM.

It is important to clear the P0362 code from the PCM after each repair is performed, and retest the system. In the event that the code does not return, it is probable that the mechanic has fixed the issue causing the problem. By performing this test after every repair, the mechanic will know exactly what the problem was, and will be better able to diagnose and repair the issue again should it ever be a problem in the future.

Additional comments for consideration regarding the P0362 code

In many cases, damaged circuits in the ignition coil circuit are caused by wildlife crawling into the top of the engine to seek warmth or shelter from bad weather. It’s a good idea to keep a vehicle in a garage, or covered, to prevent this from happening.

Need help with a P0362 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...


Related questions

Q: While highway driving, car stopped accelerating & became inoperative

This message indicates there is a problem in the anti-lock braking and/or electronic stability program system. If the problem is severe enough, the vehicle will go into limp mode, as you experienced. The root cause could be anything from a...

Q: I have a 2010 Buick Enclave cxl and the engine light when on a week ago on Monday I took it to auto zone and they gave me a code f

Most emission codes will not result in a no crank condition. Once the cause of the no crank/no start fault is repaired though, you should still request a check engine light diagnostic so that the responding certified mechanic can find...

Q: rough idle, heavy missing, fault codes P0301 and P0456. lack of power, where do i start to diagnose this?

Hi there. From the description you have provided, for the P0301 rough idle and heavy misfire and P0456 evaporative small leak detected, the problems are unrelated. The P0301 is a #1 cylinder misfire code. It could be, a spark plug...