What Is the P2122 Code?
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The P2122 code indicates that the powertrain control network (PCM) has detected an issue with the throttle position sensor (TPS), specifically that the sensor is running too low of a voltage. Most vehicles set the lower limit at .17 volts. The “D” in the description indicates that the D sensor, which is usually the fourth sensor within your circuit, is the one noticing the problem.
More About the P2122 Code
This position sensor is part of your car’s electronic throttle control system (ETCS). When you press the accelerator, it causes the TPS to send a signal to your PCM, which will tell the PCM how much power you need depending on how far you’ve pressed that pedal. This way, the PCM can tell the throttle plate how much to open. If the TPS has a low voltage, then the PCM can’t be completely sure it’s sending the right signal and will set this code.
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What Are the Symptoms of a P2122 Code?
Depending on the exact problem, your symptoms may vary. It will start with the check engine light, but the severity of your other symptoms may have to do with your car make and model, how low the circuit is, and any other codes you’re dealing with. You’ll often see a decreased engine performance, and your vehicle may even set a “limp mode” or “limp home mode,” which shuts down all non-essential functions of the vehicle and limits acceleration. Stalling and, occasionally, no acceleration may also be present.
What Are Some Causes of a P2122 Code?
For the most part, this diagnostic code happens due to an issue with the assembly or mounting process of the TPS, including potential issues with the circuitry, such as a short to the ground or to a different wire. You may also just be experiencing a fault within the TPS or, uncommonly, a fault within the PCM itself. This problem often comes up if you’ve just recently replaced the TPS and the installation process created this problem.
How Serious Is the P2122 Code?
Even if your engine isn’t entering a no-start mode and refusing to let you drive, you should still assume this problem is fairly serious. A low circuit can turn into no circuit pretty quickly, and no one wants to lose control of their acceleration randomly on the highway. Plus, the problems with the function that the P2122 creates are very frustrating to deal with.
Can I Still Drive with a P2122 Code?
If you don’t see severe drivability problems and the car isn’t in a no-start fault, then you’ll often be okay to drive it to the repair shop to get a fix for it. However, if you’re in any way concerned about drivability, it’s always a good idea to contact the repair shop you’re planning to visit to see whether you might need to get a short tow instead of driving.
How Easy Is It to Diagnose a P2122 Code?
The diagnosis process of the P2122 code has to do with how many trouble codes you’re experiencing, visually inspecting all wiring and connectors, and checking things like the voltage readings. This can actually be a multi-hour diagnostic process, especially since many tests and test drives may be needed to ensure the problem is fixed. While some skilled beginners may be able to do this process, most experts recommend bringing your car in for a fix.
How Difficult Is It to Inspect a P2122 Code?
The inspection process is difficult mostly due to the large number of wires and general wiring you’ll be dealing with in the process. Oftentimes, you’ll need to replace or reposition certain wires, replace wiring and connectors within your harness, or even replace certain sensors and motors that might be causing the problem.
Need Additional Help with Your P2122 Code?
A P2122 code can be a significant problem for many vehicles. While the fix may be very simple and easy, it can also be a multiple-hour ordeal that takes a long time and requires you to test out multiple things. If you’re looking for a way to fix this problem without having to go through all of those processes yourself, then a local expert can help you fix the problem.
With Kelley, you can find a repair shop in your area that’s able to take on the problem. Kelley makes it easy for you to find a local repair shop that can handle your make and model, no matter what it is or what problems you’re experiencing.
You may also not be seeing this code all by itself. If you want to learn more about any other codes your engine might be throwing, then check out the KBB OBD-II database. It’s a great way to get more information about different ways your vehicle might be having issues.
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