Error Code P2639: What It Means & What To Do?

<<See All OBD Codes

You will have the OBD-II code P2639 set by the Powertrain Control Module if there’s an issue with the communication between it and the Transmission Control Module (TCM). This code is also defined as a Torque Management Feedback Signal "A" Low. Read more to know about the code, and how to diagnose and resolve it.

The P2639 is set when one of the components within the torque management sends a signal to the supporting control modules and this signal is not in the expected voltage range. The controllers here refer to Transmission Control Module (TCM), the ABS control module, body control module etc. The letter ‘A’ here refers to a specific area of the involved circuitry that is having the problem.

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

• Presence of an open or short because of the damaged CAN bus, or wires/connectors
• A lose ground strap or damaged ground wire to the involved control module
• A faulty CAN bus harness which is causing issues with transferring information correctly

1. Transmission Control Module - Is the central module which controls the transmission of your vehicle. It makes use of the sensors in the vehicle, and also the information given by the ECM to change gears as needed. A problem in the TCM causes P2639 code to set. Solve this issue by repairs or replacements. Buy the perfect TCM or its parts on PartsAvatar, its online and super easy.
2. Powertrain Control Module - Is the brain of your vehicle which processes and controls all the modules in the vehicle. It helps the vehicle to function properly. A faulty PCM can be the reason for the P2639 code set. You can find the right replacement with us on PartsAvatar, and place an order from your home. We will deliver your order in just a few days. We ship to the remotest corners of Canada!
3. Engine Control Module - The ECM is responsible for ensuring that all the modules and sensors of the vehicle are working in sync. The ECM sets the P2639 code when it detects a communication issue with the TCM. Find an ECM replacement on our website by streamlining your search as per your vehicle, make, model and year of manufacture. Find support online 24/7 from our customer care executives.
4. Mass Airflow Sensor - Its purpose is to detect the rate of air entering the engine. A faulty MAF sensor can lead to the P2639 code to be set. In order to resolve it you can opt for repairs initially and see if that helps otherwise go for replacement. Avail free shipping on orders above $99 only on PartsAvatar.
5. Body Control Module - This is basically an electronic control unit which monitors and controls the various electronic accessories in a vehicle's body. A problematic body control module can cause the P2639 code to set. Resolve the problem by repairs or replacement. You can find the replacement online at PartsAvatar and get free shipping on order over CAD $99.
6. Antilock Brake Control Module - This is primarily a microprocessor that runs diagnostic checks of your vehicle’s antilock braking system and passes this information from wheel-speed sensors and the hydraulic brake system to understand when to release braking pressure at a wheel that’s about to lock up and start skidding. You can resolve a faulty Anti-Lock brake control module by repairs or replacement.
7. Fuel Injection Control Module - Is responsible for regulating the flow of fuel through the vehicle's injection pump and fuel injectors. A faulty FICM can be the cause of P2639 code, try to repair or replace as needed to get rid of this OBD code. You can look for replacements on PartsAvatar.

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 P2639 here:

Common Symptoms

• Transmission is showing issues with shifting efficiently
• Check engine light is illuminated
• Poor drivability
• Engine is stalling frequently
• Acceleration is slow and sluggish
• Fuel efficiency has gone down

Here are some ways with the help of which you will be able to correct the OBD Code P2639

• Replace or Repairing all the faulty wiring and connections that are present
• Repair the harnesses and connectors of the CAN bus network that may be damaged
• Repair or replace the faulty Control Module
• Issues with the Mass Airflow Sensor will need 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, Mass Airflow Sensor, Pcm, Automotive Control Module, Antilock Brake Control Module, Body Control Module, Fuel Injection Control Module and a lot more for our precious customers.

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

• Connect your vehicle to the OBD scanner and retrieve all the codes and freeze frame the data. Also make a note of them in their order of occurrence, this will help in referring if there’s an intermittent code present. Now clear the codes and go on a test drive to see if the code returns. At this point if the PCM enters readiness mode then you have an intermittent condition, which may need to worsen before an accurate diagnosis can be made.
• If the code is reset you will have to continue your diagnosis.
• A specialised CAN scanner will have to be used to detect control module operation and the pin values. Refer the vehicle manual or Technical Service Bulletin to find the values that are needed for your specific vehicle.
• Perform a visual inspection of all the wiring and connectors and see if there’s any damage present. There may be some loose connections that will need your attention, also any loss of continuity or battery ground will also have to be fixed.
• Test the torque management feedback signal of the concerned control modules to see if everything is well in the specification given by the manufacturer.

Common Mistakes When Diagnosing the P2639 Code

• Malfunction of the Powertrain Control Module (PCM)
• Failed Transmission Control Module (TCM)
• Multiple issues with wiring