P0201 Injector Circuit Malfunction: How to solve

The injector circuit is an essential component of your vehicle’s engine. It ensures the correct amount of fuel is delivered to the engine to keep it running smoothly.

However, when the injector circuit malfunctions, it can cause significant problems that affect your vehicle’s performance.

In this article, we’ll take a closer look at injector circuit malfunction, including its causes, symptoms, and solutions.

What is an P0201 Injector Circuit Malfunction?

An injector circuit malfunction occurs when the fuel injector doesn’t function correctly, leading to inadequate fuel delivery. When the fuel injector fails to operate, the engine receives either too much or too little fuel, leading to engine misfires, reduced fuel efficiency, and ultimately, engine damage.

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Causes of P0201 Injector Circuit Malfunction

Several factors can lead to injector circuit malfunction, including:

  1. Wiring Issues: Faulty wiring is one of the primary causes of injector circuit malfunction. Corroded or damaged wires can’t deliver the correct amount of voltage to the injector, leading to reduced fuel delivery.
  2. Malfunctioning Fuel Injector: A malfunctioning fuel injector can’t provide enough fuel to the engine, leading to engine misfires and poor fuel efficiency.
  3. Faulty Fuel Injector Driver Circuit: The fuel injector driver circuit is responsible for controlling the fuel injector’s voltage. If it fails, the fuel injector won’t receive the required amount of power, leading to reduced fuel delivery.

Symptoms of Injector Circuit Malfunction

Here are some common symptoms of injector circuit malfunction:

  1. Reduced Engine Performance: A malfunctioning injector circuit can lead to reduced engine performance, resulting in engine misfires, reduced acceleration, and poor fuel efficiency.
  2. Check Engine Light: If the engine control module detects an issue with the injector circuit, it will trigger the check engine light. This warning light will alert you to the issue, giving you time to address it before it causes significant engine damage.
  3. Engine Stalling: In severe cases, the engine may stall due to inadequate fuel delivery caused by injector circuit malfunction.

Solutions for P0201 Injector Circuit Malfunction

There are a few solutions you can try if you’re experiencing injector circuit malfunction:

  1. Replace the Fuel Injector: If the fuel injector is malfunctioning, replacing it with a new one can fix the problem.
  2. Repair the Wiring: If the wiring is corroded or damaged, repairing or replacing it can improve fuel delivery and prevent injector circuit malfunction.
  3. Check the Fuel Injector Driver Circuit: A faulty fuel injector driver circuit can be replaced or repaired to restore proper fuel delivery.


Injector circuit malfunction can be a massive headache for car owners. However, understanding its causes, symptoms, and solutions can make it easier to diagnose and fix. If you’re experiencing injector circuit malfunction symptoms, take your car to a certified mechanic for diagnosis and repair.


  1. Can injector circuit malfunction lead to engine damage?

    Yes, injector circuit malfunction can cause engine misfires, reduced acceleration, and poor fuel efficiency, ultimately damaging the engine.

  2. How can I know if my car has injector circuit malfunction?

    Common symptoms of injector circuit malfunction include reduced engine performance, check engine light, and engine stalling.

  3. Can I fix injector circuit malfunction on my own?

    Unless you’re a certified mechanic, it’s best to take your car to a professional for diagnosis and repair.

  4. Can corroded wiring cause injector circuit malfunction?

    Yes, corroded or damaged wiring is one of the primary causes of injector circuit malfunction.

  5. Is it safe to drive with injector circuit malfunction?

    Driving with injector circuit malfunction is not recommended as it can lead to serious engine damage, stalling, and even accidents.