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Dodge Dakota P0122: TPS Circuit “A” Circuit Low Input

 

P0122 It is a common fault code with the dodge dakota. It is an OBDII code that refers to problems with the Throttle Position Sensor (TPS). This is a relatively serious problem, as it can leave your vehicle stranded or very limited.

Dodge Dakota Diagnostics P0122

The OBDII code P0122 is a serious problem that requires close attention. Diagnosing it can be difficult without a good scanner and knowledge of what you are doing. Below is a YouTube video showing how to diagnose with a scanner.

P0122 Definition

P0122 will activate in your Dodge Dakota if your TPS “A” circuit is reporting a voltage number that is too low. It is a general powertrain code, meaning it has the same meaning regardless of who manufactured the vehicles (1996+).

Dodge Dakota P0122 Symptoms

The symptoms of P0122 are going to vary by year and model, but they are certainly going to cause noticeable changes in the way your Dakota runs. Without a proper TPS signal, your vehicle will compensate in several ways.

These are the most common symptoms of P0122:

  • throttle response– It barely responds to the accelerator. This limited power is a safety mechanism so that the vehicle can move, but not super fast. Since the ECM won’t actually know how much throttle response is produced when you step on the gas.
  • Idle speed problems– Without knowing exactly where the throttle is, the Dakota’s computer may have difficulty getting the idle speed correct.

Causes of P0122 – Dakota

P0122 Dodge Dakota

There are a few problems that cause P0122. Are:

  • Wiring problems– Since the TPS is so accessible, a good starting point is to do a visual inspection of the wiring and the wire harness leading to it from the engine computer. Is there any damage? Here is a great article on diagnosing a short circuit.
  • bad TPS– There is a video on YouTube on how to diagnose a TPS sensor. If you need one they are pretty cheap on Amazon.
  • The TPS is not mounted correctly– Although not very common, it is possible that the TPS sensor has not been mounted correctly. If you have recently replaced it and you get P0122, it is a good idea to check the instructions for the replacement sensor and see if it is mentioned.

Dodge Dakota Diagnostics P0122

A good mechanic will use a scanner to diagnose when the codes were set and reset them. Then they will see if the problem appears again.

If everything checks out and the code comes back, you can go ahead and replace the TPS sensor in question. Most of the time, the problem when P0122 is thrown will be the TPS sensor itself. It is no longer accurately registering the force with which the fuel pedal is depressed.

Diagnosing the problem with a scanner or having a mechanic take a look can save you the expense of purchasing a TPS sensor that your Dakota doesn’t really need.

Good luck diagnosing P0122 on your Dodge Dakota. If there is anything you want to add, leave a comment below.

 

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