P2131 OBD Error Code: Problem & Solutions

In your vehicle the Throttle Position sensor (TPS) send information about the throttle position to the PCM. This code is indicative that the vehicle computer i.e. the PCM has picked up a problem in any particular throttle position sensor circuit. Other modules that may also have picked up this issue include the body control module, the fuel injection control module, the turbo control module, transmission control module, the body control module, the anti lock brake control module, the instrument panel control module, the anti-theft module, the cruise control module, etc. Whenever the PCM is able to detect a voltage that is not within the normal range prescribed by the manufacturer the P2130 code will be set.

What causes this problem with the Throttle Position Sensor/Switch F Circuit Malfunction?

• Throttle return spring sticking
• Corrosion of the MAP or TPS connector
• Chafing caused by misrouted harness
• Poor TPS
• Malfunctioning PCM 

1. Throttle Position Sensor - This helps in monitoring the throttle position of the vehicle. A malfunction of this sensor can cause the P2131 code to set. It is hence important to fix any damages via repairs or opt for replacement. You can find the one compatible with your vehicle make and model at PartsAvatar, we have a large variety of TPS available on our website. You can order easily from the comfort of your home and have it delivered to you in just few days!
2. Switch Circuit - It is important that all circuitry be working well in a vehicle, damages in the circuit system are the prime causes for OBD errors to set. In the case of P2131 you can easily solve your issues by repairing or replacing any issues with the switches and circuits. Buy them online from PartsAvatar and buy good quality products, for a wide range of price from different brands all in one place.
3. Intake Manifold Tuning Valve - The intake manifold is responsible for evenly distributing the combustion mixture to each of the intake ports of the vehicle. The tuning valve helps in this process. If it’s damaged it can result in the P2131 code to be set, resolve this issue by repairing or replacing it accordingly.
4. Powertrain Control Module - The computer of your vehicle has to always be in top condition, otherwise things can go haywire. If you have noticed troubles with the PCM, try to repair otherwise replace easily with Parts Avatar. You can avail free shipping on order s valuing over CAD 99$.
5. Diagnostic Tools - Non-functional or Inaccurate diagnostic tools can mess with your diagnosis. It’s crucial that they’re working well, buy them online with PartsAvatar. We ship across Canada from our warehouses.
6. Accelerator Pedal sensor - The APP sensor shows the position of the accelerator pedal to the engine control unit PCM. Accordingly the vehicle will move. Having an faulty sensor can cause the P2131 code to set. It’s best to either repair or replace it and get rid of the code. You can buy required parts online at PartsAvatar Canada.
7. Engine Control Module - The ECM module is responsible for controlling the fuel mixture, ignition timing, variable cam timing and emissions control etc. of your vehicle so if it’s not functioning properly it can result in the P2131 code setting. Try to repair or replace it as needed. PartsAvatar has a wide range of ECM available, order from the comfort of your home and have it delivered right to your doorstep

Willing to know some common symptoms of OBD Code P2131? Your wish is our demand. Have a look at them below:

Common Symptoms

• Check engine light is illuminated
• Presence of Intermittent stumble upon acceleration or deceleration
• Black smoke found on acceleration
• Vehicle not starting

If you want to easily diagnose this fault code P2131, then follow the steps mentioned below:

Get hold of the OBD scanner of your vehicle, a digital volt/ohmmeter and an oscilloscope to be able to perform diagnosis. Apart from these tools you will also need your manufacturers service manual. Once you have all this ready, start off my simply running a visual inspection of all the wiring and connectors associated with this issue. Once you have spotted issues, proceed to repairing or replacing these damages, shorted, corroded wires or connectors. You may also find some being disconnected and components that may be beyond repair. Do the needful and move on to retesting the system to ensure success of the repairs/replacements done. If they all seem to be in good working condition now, you can connect the OBD scanner and record all the codes that are stored and freeze frame the date. Make sure you write in the order of occurrence, knowing these codes can help resolve issues that may be intermittent in nature. Now you can safely clear all the codes and take your vehicle on a test drive to see if the code resets or the vehicle enters readiness mode. If the code doesn't set, then it’s a sign that you may have an intermittent condition, these can prove to be challenging, and in most cases the situation needs to worsen before correct diagnosis can be made.

If you find that code has been reset, you can continue with the diagnosis, the P2131 code is applicable only to those vehicles that have an electronically controlled throttle body, they’re hence also referred to “drive by wire” throttle bodies. There’s a sensor present on the accelerator pedal arm, which inputs a voltage signal to the PCM or related controllers, this signal commands the throttle body to be opened or closed, based on the conditions. The voltage signals from the PCM then activate the throttle actuator motor as per required by the changing voltage levels and polarity into the direction requested. When the motor turns, a gear in the throttle body which is meshed with a larger gear also turns. This ratio change is what allows the throttle plate to open quickly and suddenly or slowly and gradually as per the command of the controller. So you need to start testing at the throttle position sensor electrical connector, simply disconnect the connector from the sensor and use the DVOM to check voltage as well as ground signals. You should typically get a 5-volt signal and battery ground should also be there. To be able to find the exact position of these components, refer the wiring diagrams of your vehicle manufacturer.

Upon testing, if you have found no ground or voltage then you will have to disconnect the PCM connector as well as all the controllers related, and then perform the same test on all the circuits. As per requirement, repair or replace any damaged circuitry. Now you can clear the codes and again test-drive your vehicle and see if that has resolve the P2130 code. If you find that the voltage and ground signals are not in sync with the manufacturers prescribed specifications, then you will need to make use of the oscilloscope and monitor the operation of the pedal sensor. Be careful and observe any abnormal spikes in voltage, glitches etc. and replace the throttle pedal position sensor as needed. Now again, clear codes and go on a test drive to be able to conclude if the repairs have resolved the problem or not.

If you have found that both the throttle position sensor as well the related circuits are complying with the specifications of the manufacturer then you may mostly be dealing with a defective PCM or any other controller. Replacement of the controllers requires programming by a professional.

In some cases you may need to replace the whole throttle body, this includes the actuator motor, and the throttle position sensor as well. Your mechanic may also recommend a replacement of the pedal sensor. You may also find that the issue is related to the Control Area Network (CAN) in such a case you will need a professional to sort it out. This code is rather complicated one and you may need a professional to manage the bulk circuitry that is involved in this problem.

Codes likes these can be cause due to defective or disconnected system grounds, in such a scenario an auxiliary ground cable can be used for diagnosis. You can also try to look for any loose or corroded electrical connectors which may increase circuit resistance and possibly cause the code to be stored. For this you can refer a CAN bus system wiring diagram and locate the wires and via DVOM test the continuity between individual controller connectors. Once you have all your findings compare them to the ones prescribed by your manufacturer and accordingly repair or replace the circuits.

Common Mistakes When Diagnosing the P2131 Code

• Failed Accelerator Pedal Position (APP) assembly
• Failed Powertrain Control Module (PCM)
• Malfunctioning Throttle Position Sensor (TPS)
• Issues present with the wiring