Guide To P2637 OBD Error Code Solutions

<<See All OBD Codes

The P2637 is a generic OBD-II code, and is defined as a Torque Management Feedback Signal "A". The Powertrain Control Module (PCM) will set the code when it notices as issue with communicating with the Transmission Control Module. Both these modules work together to be able to produce the desired output for the vehicle to run smoothly.

The TCM will request the Engine Control Module (ECM) to reduce the engine torque so that the shift feel can be improved. When this request is sent the ECM retards the base ignition timing and notifies the TCM that the request has been acted upon. In case the ECM is unable to perform the request it will inform the TCM regarding the failure to do so.

What causes this problem with the Torque Management Feedback Signal "A"?

• Fault with the Engine Control Module (ECM)
• The Transmission Control Module (TCM) is not working
• Software update needed for the Engine Control Module (ECM) and TCM
• The harness of the ECM is open or shorted and circuit is showing a poor electrical connection

1. Transmission Control Module - Makes use of the sensors in the vehicle, and also the information given by the ECM to change gears as per need. An issue with it can cause P2637 code to set. Fix this issue by repairs or replacements. Shop TCM and its parts on PartsAvatar, its online and super easy.
2. Powertrain Control Module - Is the central unit that processes and controls all the modules in the vehicle. Its job is important as it helps the vehicle to function properly. If you have the P2637 code set, it may be due to a faulty PCM. You can find the perfect replacement with us on PartsAvatar, and place an order from the comfort of your home. We will deliver your order in just a few days!
3. Engine Control Module - The ECM module is responsible for ensuring that all the modules and sensors of the vehicle work in sync. The ECM sets OBD-II codes as per the issue it has detected. Find an ECM replacement on our website by streamlining your search asper your vehicle, make, model and year of manufacture. Our 24/7 online customer care executive will help if you need any assistance.
4. Mass Airflow Sensor - Its responsibility is to detect the rate of air entering the engine. A malfunction of the MAF sensor can lead to the P2637 code, but you can resolve it via repairs or replacement. To have replacement parts delivered right to your doorstep, simply order online on PartsAvatar.
5. Speed Sensor - detects the speed of the drive wheels and sends this information back to the engine control unit. This sensor also helps the wheels to latte as needed so that the speed is manageable as the engine continues to run. This ups the efficiency of the vehicle. You can find a replacement for a problematic speed sensor at PartsAvatar, and avail free shipping on orders above $99.
6. Fuel Injector - The fuel injector does what its name suggests, its prime job is to inject fuel at the right pressure at the right time as needed by the vehicle. The P2637 code can be gotten rid of by fixing the problem you have found out in the fuel injector. If repairs aren’t solving the issue, opt for replacement with PartsAvatar. We ship to the remotest corners of Canada, from our warehouses.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2637 here:

Common Symptoms

• Check Engine Light in
• Issues with shifting transmission properly

Here are some ways with the help of which you will be able to correct the OBD Code P2637

• Repairs or replacement of the Mass Airflow Sensor
• Repair or replace the Transmission
• Repair or replace the speed sensor
• Fuel injector needs repairs or replacement

There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have high grade Transmission Control Module, Engine, PCM module, Wiring, Connectors, Engine Control Module, Airflow Sensor, Engine RPM, Speed Sensor and a lot more for our precious customers.

Here are some steps which you should follow in order to diagnose this fault code:

The transmission control module requests the PCM to reduce effective engine RPM, this is done to improve the feel auto transmission shift. The PCM is further requested to reduce torque when in certain shifting conditions also. The PCM responds to this type of a request by retarding the ignition timing and sensing a signal to the transmission that the job has been completed. If PCM is not successful in the reduction of torque produced by the engine, then a failure message will be sent to inform the TCM about the same. A code is then storing and the check engine light will be lit. The CAN is used communicate torque reduction requests between the controllers.

The CAN bus more complex than we may think, it has a lot of wiring harnesses and connectors that enable it in sharing information between multiple vehicle modules. These controls have the capacity to run almost all the electrical functions of the vehicle, the primary controller however is the PCM.

All control modules receive input data from the different sensors and respond with output signal to system components as well as other control modules. This signal gets forwarded in a systematic fashion to the affected control modules, which then use the data to fulfil the tasks needed. Traction Control System uses information to regulate vehicle traction control strategy, the anti-lock brake controller will compare the speed of the vehicle received from the PCM with the individual wheel speed sensors so that it can operate the anti-lock braking system. The cruise control module employs information for controlling speed. In order to diagnose this code several tools will be needed.

Use the OBD-II scanner and DVOM to perform the diagnosis. Connect the scanner and retrieve all the codes and freeze frame the data. It’s also important to make a note of the codes in their order of occurrence, to identify any intermittent codes. Clear them and go on a test drive to see if the code returns or if the PCM enters readiness mode. If the former happens you will have to start your diagnosis by performing a visual inspection of the electrical units, wiring, harnesses and connectors. All those that appear damaged will have to be repaired or replaced as needed. Pay attention to any corrosions, disconnected wires, bent pins etc. Retest the system after repairs/replacements to see if the issue has been resolved. Record all codes and freeze frame the data again. If the code returns then disconnect and test each and every pin of the CAN bus and find readings of the pin values and control module operation. You can use a CAN scanner for it, the bulk circuitry involved calls for help from a professional vehicle diagnostician. An issue found with the PCM will require reprogramming too.

Using the DVOM can help but will be time consuming as thousands of circuits will have to be probed individually to test them, even one probe if is misplaced can cause great damage to the control modules and may even result in needing to reprogram the entire vehicle. Continuity tests however can be attempted once all modules are disconnection. Depending on the vehicle it may take over 40 hours to do this.

Test the control module ground circuits for battery ground and continuity. The P2637 and related codes are usually caused due to a defective or disconnected system ground. The ground discrepancies can be diagnosed via an auxiliary ground cable. Make sure that the ground cables, straps and wires aren’t left dangling after the repairs are performed. Get hold of the CAN bus system wiring diagram and test continuity between each controller’s connector via a DVOM. See if your findings match up to that of the manufacturers. Try to repair any damage to the wiring, and opt for replacement if that doesn’t get rid of the P2637 code.

Common Mistakes When Diagnosing the P2637 Code

• Failed Powertrain Control Module (PCM) failure
• Malfunction of the Transmission Control Module (TCM) failure