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Summary
  • A logged P0202 code means that the PCM has detected a circuit interruption issue in the #2 fuel injection circuit. These issues typically include a broken wire, a loose terminal, or a burned-out injector coil.
  • This trouble code generally appears when the PCM is unable to detect the expected voltage spike from the #2 injector.
  • If a P0202 code is set, you might notice that your engine is misfiring, running rough, and accelerating poorly.

Most vehicles today use computerized fuel injection systems that allow each cylinder to receive its own dose of fuel and have the appropriate air/fuel ratio changes according to the engine load. Thanks to electronic fuel injection (EFI) systems, many vehicles benefit from reduced emissions, better fuel economy and performance, and reduced instances of cold starting.

Fuel injectors are pulsated by the powertrain control module (PCM) via the PCM microprocessor. This part applies a small pulse to the transistor driver circuit, which makes the transistor conductive. Any problem detected by the PCM that involves the injector circuit may cause it to log the P0202 code.

What Does the P0202 Code Mean?

Diagnostic trouble code (DTC) code P0202 stands for “Cylinder 2 Injector Circuit/Open,” and indicates a potential problem with the #2 fuel injector circuit, like a broken wire, loose terminal, burned out injector coil, or some other circuit interruption issue.

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When the injectors on an MPI unit is grounded, the injector pintle raises off its seat, and fuel flows during that very brief instant (1-5 milliseconds).

When the ground to the injector coil is released, the pintle spring snaps it back against its seat, fuel flow stops, and the collapsing magnetic field induces a spike of about 50 volts that travels back toward the ECM/PCM on that ground trigger circuit, which is designed to handle those voltage spikes. Some ECM/PCMs will measure these spikes to verify injector operation.

Once your vehicle’s powertrain control module (PCM) does not detect the expected voltage spike from the #2 injector, it triggers code P0202. Alternatively, If it doesn’t sense 12 volts on the trigger (PCM) side of the injector (coming through the injector coil from the opposite side), it can interpret that as an injector circuit fault and store the code. It varies from OEM to OEM.

You can get more information that can help you properly diagnose and troubleshoot P0202 in our technical discussion about fuel injection.

mechanic fixing fuel injectors
Any problem detected by the PCM that involves the injector circuit may cause it to log the P0202 code.

Note: The definition of code P0202 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0202 Code?

  • Open in the injector wiring
  • Shorted injector wiring
  • High resistance in the injector circuit
  • Faulty fuel injector
  • Defective PCM

What are the Common Symptoms of the P0202 Code?

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How to Diagnose the P0202 Code

The P0202 code is a generic powertrain code that is applicable to many OBD-II-equipped vehicles. Note, however, that the process of repairing the issues associated with this DTC may vary depending on the vehicle’s make and model.

If you’re a seasoned DIY-er who knows your way around diagnosing trouble codes, then you may check the issue yourself. Otherwise, it’s best to bring your vehicle to a certified mechanic to get a proper diagnosis.

To help you get started, here are some videos to give you some insights as to what processes may be involved in diagnosing the P0202 code:

How to Fix the P0202 Code

Fixing a P0202 code without the right tools and know-how may be a confusing task. If you’re not confident with your DIY skills yet, it’s best to leave the job to a professional. But if you think you have enough knowledge and the proper tools (e.g. scope, noid lights, etc.) to test the fuel injector yourself, feel free to tackle the issue on your own. Just make sure to consult a repair manual or repair database from credible sources like Chilton or ALLDATA for vehicle-specific information.

Where to Get a New Fuel Injector to Resolve Code P0202

A damaged or clogged fuel injector will definitely take the fun out of driving your car. So, if that’s what triggered the P0202 code, don’t leave it unresolved for long. Order a top-notch fuel injector replacement here at CarParts.com.

Over one million parts are at your fingertips here at CarParts.com, with every product sold at the best price possible. Carefully handpicked by a team of industry professionals, our fuel injectors passed strict quality checks, guaranteeing maximum dependability and durability.

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Find the right fuel injector for your ride by entering your vehicle’s specifications into our vehicle selector. For a more personalized shopping experience, use the search filters to find a product according to your preferred brand, price range, quantity, and more. Order now, and we’ll deliver the part you need straight to your doorstep in as fast as two business days.

Get your fuel injector without going over budget. All our parts come with a low price and lifetime replacement guarantee, so you don’t have to worry about breaking the bank for your repairs.

Don’t leave your daily driver cooped up in the garage because of this trouble code. Check out our products today, and take advantage of our unbeatable deals on fuel injectors here at CarParts.com!

Shop this Project

Replacement – Fuel Injector, with Red Connector
, P0202 Code: Injector Circuit / Open – Cylinder 2
$17.49 Price and rating may change from the time content is published.
Replacement – Fuel Injector, Blade Type, 2-Prong Male Terminal, Includes O-Ring
, P0202 Code: Injector Circuit / Open – Cylinder 2
$21.54 Price and rating may change from the time content is published.
Replacement – Fuel Injector – New, Sold individually
, P0202 Code: Injector Circuit / Open – Cylinder 2
$17.49 Price and rating may change from the time content is published.
About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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