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Your vehicle’s fuel injectors are just some of the many components that are crucial for engine operation. Without them, fuel cannot reach your engine cylinders, and there would not be enough fuel to keep your vehicle running. OBD-II code P0201 is a generic diagnostic trouble code that is supported in various makes and models and is one of the several listed codes that indicate potential issues in your fuel injector circuits.

What does the P0201 Code Mean?

Diagnostic trouble code (DTC)code P0201 stands for “Cylinder 1 Injector Circuit/Open.” It indicates a potential problem with the #1 Fuel Injector Circuit. Once your vehicle’s powertrain control module (PCM) does not detect the expected voltage spike from the #1 injector, it triggers code P0201.

Note: The definition of Code P0201 may vary depending on the vehicle manufacturer. It is best to consult your trusted repair manual or repair database for the exact code definition.

Fuel Injector Operation

Ideally, when the injector is switched on, the expected voltage should be low or close to zero. When the injector is off, there should be an increase in voltage. If the voltage readings are not what is expected, the PCM may trigger code P0201. Aside from that, this code may also be triggered in case the PCM detects irregularities in circuit resistance.

Many owners have reported P0201 for the following makes: Cadillac (especially on a Cadillac CTS), Dodge, Jeep, Mazda, and Chevrolet.

What are the Possible Causes of the P0201 Code?

Code P0201 may be triggered due to a number of reasons. Here are some of the possible causes of the code:

  • Defective fuel injector
  • Circuit issues, such as corroded wiring or poor connections
  • An issue with the PCM, such as software in need of an update

What are the Common Symptoms of the P0201 Code?

Here are possible symptoms to watch for:

  • Illuminated check engine light
  • Engine misfire
  • Rough running engine
  • Poor fuel economy
check engine light is on 2
An illuminated check engine light is one of the common symptoms of trouble code P0201.

How to Diagnose the P0201 Code

Code P0201 has several triggers, and it may sometimes be difficult to determine what is causing this fault. If you are not well-versed with auto repair, it is best to have your vehicle checked by a trusted mechanic or bring your vehicle to an auto repair shop for proper diagnosis.

However, if you have the DIY repair skills and you’re determined to diagnose this code yourself, here are videos to help you understand the code better:

How to Fix the P0201 Code

There is no universal fix for this code. Repair and diagnostic procedures may vary depending on your vehicle’s make and model. For example, the repair steps for P0201 for a Jeep may be different from the repair steps of P0201 on a Mazda.

If you don’t have the proper DIY repair skills, it is best to leave the job to a trusted mechanic. However, if you’re confident you can fix it yourself, you can utilize online auto repair sources and guides to know which repair steps are applicable to your vehicle. To help you, you may also opt to get an ALLDATA single-vehicle subscription.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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