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For example, when the injector 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.

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.

If you don’t have a lot of experience diagnosing or fixing trouble codes, it’s best to leave the work to a professional mechanic, so that you can avoid problems and more expensive repairs down the line.

To start shopping, visit our website and fill out our vehicle selector to narrow down your search to compatible fuel injectors. Then, use the search filters to view the ones that match your preferred brand, price range, and more.

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Luckily, there are repair manuals and repair databases to help you figure out what needs to be done. One of the most reliable sources is a vehicle-specific repair manual, which is written for your vehicle’s exact make and model. A repair manual also contains detailed repair information, as well as illustrations and diagrams to help you better understand the issue.

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The P0203 code is considered severe. Driving while your vehicle has triggered this code without having it repaired is highly discouraged. If you encounter this code, we recommend taking your vehicle to a nearby repair shop for diagnosis.

Don’t let your vehicle hang out in the garage for days because of the issues caused by the P0203 code. If a malfunctioning fuel injector is the culprit, don’t put off replacing it. For a wide selection of high-quality fuel injectors to choose from, look no further than CarParts.com.

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Many diagnostic trouble codes share the same symptoms, possible causes, and areas of concern. This is why they don’t have a single cure-all solution. Before you can even fix the P0203 code, you need to determine the exact root cause and the prescribed repair procedure for your specific vehicle.

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Diagnosing error codes like the P0203 is challenging because you need to narrow down the root cause from a list of possible causes. As such, you may need help from a seasoned mechanic or technician to find out what triggered this code in your vehicle.

From class 1 to class 5, all CURT custom-fit receiver hitches are made in the USA to ensure quality from design to finish (may include imported hardware). They are designed with hands-on engineering for a precise fit. They are welded using a combination of manual and robotic operations for speed and accuracy. Finally, they are finished with our unique co-curing process. Each hitch is dipped in a liquid A-coat for rust prevention, inside and out, and then co-cured in a durable black powder coat finish for maximum rust, chip and UV resistance.

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Note: The definition of code P0203 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

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Diagnostic trouble code (DTC) P0203 stands for “Injector Circuit/Open – Cylinder 3.” The powertrain control module (PCM) may set this code if it has detected a potential error in the injector or the injector wiring. It may also register this code if it can’t control the fuel injector.

Each CURT class 3 hitch is engineered to fit on a specific vehicle. This provides the best possible fit and easiest installation. This particular custom class 3 hitch fits specific years of the Chevy City Express and Nissan NV200 (to verify vehicle compatibility, see the CURT application guide or use the Vehicle Lookup tool). It is designed to integrate with the vehicle's existing features and offer a reliable connection to your trailer.

If you want to know more about this code, there are a few resources that explain this code’s diagnostic process in more detail.

The PCM is equipped with special transistors called “drivers” that switch the engine’s fuel injectors on and off. When an injector is switched on or off, the PCM expects the voltage and resistance to stay within a certain range.

Or, if it doesn’t sense 12 volts on the trigger side of the injector (coming through the injector coil from the opposite side), it can use that information to store the P0203 code. It varies from OEM to OEM. Likewise, if the PCM detects that the voltage and the resistance do not fall within the expected values, the P0203 code is set.

Say you’re using your OBD-II scan tool to check your vehicle and the P0203 code appears. What does it signify? This guide will help you learn more about what the P0203 code means, as well as its possible causes and common symptoms, so that you can troubleshoot it as soon as possible.