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P2639 is a diagnostic trouble code (DTC) for "Torque Management Feedback Signal A Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
This DTC indicates Torque Management Feedback Signal A Low.
This code sets when one of the components involved in torque management sends a signal to one of the supporting control modules which falls outside of the expected voltage range. These controllers may include the transmission control module (TCM), the antilock brake control module, the body control module, the fuel injection control module, or a range of other modules which monitor the vehicle’s systems. The letter A refers to a specific area of the involved circuitry.
One of the most common culprits in this fault is a driver problem within the PCM or other supporting controller. Another frequent issue is a bad connection in the circuitry. Other possible causes may include:
The Service Engine Soon light may come on, but it may take up to eight drive cycles for this to occur. Other signs could include harsh shifting, poor drivability, engine stalls, rough idling, sluggish acceleration, and/or reduced fuel efficiency. In addition, if the Check Engine light has not illuminated yet, the DTC may show as “pending”.
Accurate diagnosis of this condition may require:
The most common error in diagnosing this condition is failure to follow the recommended procedure of diagnosing and repairing other DTCs present with the torque converter management signal fault. Transmission or drivability codes that may accompany the controller communication fault include lean exhaust, fuel injector, engine misfire, or other codes.
While this fault may not cause serious fallout, it can impair the way the vehicle runs, potentially causing you to stall out at an inconvenient time. Rough shifting may also occur, affecting drivability, as well as decreased fuel efficiency. It’s best to have this DTC diagnosed and repaired promptly.
Your technician may perform the following repairs:
This diagnosis and repair could involve extensive procedures to find the source of the fault, and often requires specialized equipment like a CAN bus scanner in order to pinpoint problems without painstaking hours of examination. In addition, some vehicle models may contain up to 18 different control modules, making it a challenging undertaking to identify the source of the problem.
For these reasons, it’s often most economical and efficient to leave P2629 repair to a qualified technician.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.