P0358 code definition
If the PCM (powertrain control module) fails to receive a valid pulse signal from ignition coil H, it will store a P0358 code and illuminate the Check Engine Light.
What the P0358 code means
The PCM continuously monitors the input signals from all of the engine’s ignition coils so that it can properly predict engine activity and provide the best strategies for ignition timing and fuel delivery. If an ignition coil is malfunctioning and/or is not sending the proper signal, the PCM will store this code because it is not getting the necessary information to perform these functions.
What causes the P0358 code?
A number of underlying problems can cause a P0358 code to be detected. These include:
- A defective ignition coil
- An open or shorted ignition coil circuit
- A poor electrical connection to the ignition coil
- A defective PCM (rare)
What are the symptoms of the P0358 code?
The only consistent symptom noted in all cases of a P0358 being detected is the illumination of the Check Engine Light. Other than this, you may also notice:
- Engine runs rough at idle
- Difficulty starting the engine
- Lack or loss of power when accelerating
- Engine hesitation when driving
How does a mechanic diagnose the P0358 code?
After using an OBD-II scanner to determine that a P0358 code has been stored, a mechanic will start by visually inspecting and examining the affected ignition coil, its circuits, wiring, and connections. If no obvious faults or damage are found, they will then swap the ignition coil pack with a good coil pack from another cylinder. They’ll then clear the code and retest the system. If the trouble code follows the coil pack to the new cylinder, then the ignition coil is the problem and should be replaced.
After completing all diagnostic steps and repairs, the mechanic will clear the code(s) again and take a test drive to determine whether or not the code has been thoroughly resolved.
Common mistakes when diagnosing the P0358 code
If the proper diagnostic steps aren’t taken, it is easy to assume that the ignition coil is to blame when it could be a loose electronic connection or another issue. With proper and thorough inspection of all possible causes, you can be sure that your repair(s) will actually fix the problem instead of wasting time and money.
How serious is the P0358 code?
The initial symptoms associated with a P0358 code may not be severe, but if the problem goes on long enough, it can result in engine pinging, engine knocking, and other problems. These can cause engine misfiring issues and other, more severe symptoms and issues that can do permanent engine damage and/or put you in a dangerous situation while driving.
What repairs can fix the P0358 code?
The right repair(s) will depend on what exactly is causing the PCM to detect and store the P0358 code. These include:
- Replacing the ignition coil
- Repairing a loose electrical connection to the ignition coil
- Replacing the wiring and/or connectors for the ignition coil circuit
- Replacing or reprogramming the PCM (rare)
Whether or not your vehicle displays any or all of the symptoms listed above, it’s important to remember that to pass an OBD-II emissions test, your vehicle must not have any warning lights (including the Check Engine Light) illuminated. If you attempt to get an emissions test before resolving this issue, your vehicle will fail and you will have to get the issue resolved before paying to take it again.
Need help with a P0358 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.
Check Engine Light
trouble codes
P0358
FAQs
It is set when an open or short is detected in the driver circuit for coil #8. The most common triggers for this code include a malfunctioning coil, circuit problems, and a PCM in need of a software update. Common symptoms include an illuminated check engine light and engine misfire.
What does ignition coil h primary secondary circuit mean? ›
OBD-II Code P0358 is defined as a Ignition Coil "H" Primary/Secondary Circuit. The ignition coil or coils are responsible for igniting the air/fuel mixture inside the combustion chambers. Without reliable performance from the ignition coil(s) the vehicle will stumble and misfire.
What is an ignition coil a primary secondary circuit malfunction? ›
What Does the P0351 Code Mean? Diagnostic Trouble Code (DTC) P0351 stands for “Ignition Coil 'A' Primary/Secondary Circuit.” It indicates that there's a potential problem with the cylinder #1 ignition coil or its circuit.
Where is the ignition coil H located? ›
This system eliminates the need for spark plug wires by placing the coil directly above the spark plug. Each coil is connected by two wires. One wire is a battery feed usually from the power distribution center, while the other wire is the coil driver circuit from the PCM.
What is the code for the ignition coil secondary circuit? ›
If the PCM cannot control the Ignition Coil, it will set code P2302. A vehicle with this code should be taken in to a repair shop for diagnosis.
What is the leading cause of secondary ignition failure? ›
Excessive heat and vibration can cause the insulating material to break down and create internal coil failure. Worn secondary ignition components such as spark plugs or wires can cause a coil work harder, require more voltage, and therefore significantly reduce the operating life of the coil.
What is the diagnostic code for a bad ignition coil? ›
As noted in the “check engine light” section, you can check for ignition coil problems by running an OBD-II check, which will require an OBD-II scanner. Codes P0300 to P0312 indicate engine misfires, while codes P0350 to P0362 are for ignition coil issues.
What is the code P0350 primary ignition system? ›
What Are Some Causes of a P0350 Code? Some common causes of a P0350 code are faulty or shorted primary or secondary circuits and defective or damaged ignition coils or coil packs. Disconnected, frayed, or otherwise faulty wiring and connectors are other common causes of a P0350 code issue.
What is ignition coil malfunction? ›
A problem with the ignition coil will cause your car to idle roughly and vibrate. A malfunctioning coil can't supply the voltage required to create consistent sparks, causing your car to jerk forward when you step on the accelerator.
What causes a P0358 code? ›
The P0358 code stands for “Ignition Coil H Primary/Secondary Circuit Malfunction.” It is set when an open or short is detected in the driver circuit for coil #8. The most common triggers for this code include a malfunctioning coil, circuit problems, and a PCM in need of a software update.
The primary circuit of the ignition coil can contain: points, points controlling a transistor, the transistor being controlled by some other means (breaker less) or electronic ignition. In point-type ignition systems the current in the primary circuit is controlled by a mechanical switch (or breaker).
What is cylinder H? ›
In a piston engine, the cylinder head (aka "head") sits above the cylinders, forming the roof of the combustion chamber. In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissaption fins.
What is the function of the primary and secondary circuits of the ignition system? ›
When the car's key is turned, the primary coil receives a low-voltage current from the battery and amplifies it to create thousands of volts. This high voltage passes through the secondary coil and then reaches the spark plugs, which ignite combustible fuel and air in the engine cylinders for combustion.
What is the primary and secondary coil in a car? ›
The primary coil is wrapped with thick enamelled wire, usually around 200-500 turns with enamelled wire of 0.5-1 mm; The secondary coil is wrapped with fine enamelled wire, usually with about 15000-25000 turns of enamelled wire of about 0.1mm.
