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P0350 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


P0350 is a diagnostic trouble code (DTC) that denotes an issue with the primary/secondary circuit for the ignition coil for cylinder 1. This code is a component of the OBDII Diagnostic II, a system that tracks and detects numerous engine issues and air pollution in modern automobiles.


P0350 indicates that cylinder 1’s ignition coil main and rear circuits are not working properly. The ignition coil shall be designed to produce a strong, voltage kinetic pulse that will ignite the mixture of gas and air in the engine’s cylinders.


There are several potential causes for the P0350 DTC code, including:

  • Problems with the Ignition Coil: The ignition coil for cylinder 1 is the most common cause of issues.
  • Wiring Issues: Damaged or corroded wiring and connectors in the ignition coil circuit can lead to this code.
  • Issues with spark plugs: The performance of the ignition coil might be affected by worn or fouled spark plugs.
  • ECM Problems: In rare cases, issues with the engine control module (ECM) can trigger this code.


Common symptoms associated with the P0350 code include:

  • Check Engine Light: The most obvious symptom is the illumination of the check engine light on the vehicle’s dashboard.
  • Engine misfire: Because Cylinder 1 couldn’t fire properly, the engine would run sluggishly and provide less power.
  • Low Fuel Economy: Low fuel economy may be brought on by a problem with the ignition.
  • Stalling: Under extreme conditions, the engine might suddenly stall.


The following actions are routinely taken by a mechanic to identify and validate the P0350 code:

  • Code Scan: To recover the recorded error codes, including P0350, use an OBD-II scanner.
  • Visual Inspection: Look for corrosion or damage in the wiring and connectors connected to the ignition coil.
  • Testing the Ignition Coil: To ensure correct operation, test the ignition coil’s resistance and voltage output.
  • Spark Plug Inspection: Check the spark plug for fouling or wear and replace if necessary.

Common mistakes

Common mistakes when dealing with the P0350 code include:

  • Replacing the Ignition Coil Unnecessarily: Mechanics might replace the ignition coil without verifying its functionality, which can be costly if the issue lies elsewhere.
  • Neglecting Wiring and Connectors: Failing to thoroughly inspect and repair damaged wiring or connectors can lead to recurring issues.

How serious is this?

The size of the problem has an impact on the seriousness of the P0350 code. While the vehicle is still running with that code, there may be a decrease in engine performance, malfunctioning, or possible stalling. Preventing further damage and achieving the optimum engine performance should be addressed as a matter of urgency.

What repairs can fix the codeS?

repair manuals

It might be essential to take the following steps to fix the P0350 error code:

  • Replacement of the Ignition Coil: If the ignition coil for Cylinder 1 is defective, a brand-new, high-quality coil should be installed in its stead.
  • Repair of wire and connections: In the ignition coil circuit, repair or replace any frayed, corroded, or damaged wire and connections.
  • Replacement of the Spark Plug: A worn-out or fouled spark plug has to be changed.
  • Replacement of the ECM: If the ECM is found to be the problem, it may need to be replaced or reprogrammed.

Related codes

Related codes that may accompany or be related to P0350 include:

  • P0351 to P0358: These codes relate to ignition coil circuit issues for cylinders 2 through 8, respectively.


The main and secondary circuits of the ignition coil in cylinder 1 are malfunctioning, according to the P0350 DTC code. It might not always result in immediate drivability issues, but it can cause poor engine performance, misfiring, and stalling. This has to be attended to right away to prevent more damage and make sure the car operates correctly. Testing the ignition coil, wires, connections, and rarely an electronic control module is necessary for diagnosis and repair.

P0350 Code – What Does It Mean & How To Fix It