P2639 OBD-II Trouble Code: Torque Management Feedback Signal A Low

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2639 code

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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2639 DIAGNOSTIC Get a fair and transparent estimate upfront

P2639 code definition

This DTC indicates Torque Management Feedback Signal A Low.

What the P2639 code means

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.

What causes the P2639 code?

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:

  • An open or short due to damaged CAN bus (the complex network of harnesses and wires connecting various control modules together) wires or connectors
  • A loose ground strap or damaged ground wire to the involved control module
  • A faulty CAN bus harness

What are the symptoms of the P2639 code?

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”.

How does a mechanic diagnose the P2639 code?

Accurate diagnosis of this condition may require:

  • Scanning the vehicle to check for any concurrent codes and to record freeze frame data
  • Clearing the DTCs to see if they return (in an attempt to diagnose an intermittent condition)
  • Using a specialized CAN scanner to detect control module operation and pin values
  • Visually inspecting all involved wiring and connectors to check for damage or loose connections
  • Testing for continuity to the battery ground
  • Testing of the control modules related to the torque management feedback signal

Common mistakes when diagnosing the P2639 code

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.

How serious is the P2639 code?

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.

What repairs can fix the P2639 code?

Your technician may perform the following repairs:

  • Verifying the set code and any other faults that are present, and recording freeze frame data
  • Clearing the data from the vehicle’s computer to see if the problem returns (otherwise an intermittent condition may exist)
  • Repairing faulty wiring and connections involved in the relevant control modules
  • Repairing any problems in the complex collection of harnesses and connectors which make up the CAN bus network
  • Replacing any faulty control modules

Additional comments for consideration regarding the P2639 code

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 P2639 repair to a qualified technician.

Need help with a P2639 code?

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 1-800-701-6230.

trouble codes
P2639
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2639 code.

SCHEDULE P2639 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,395

Rating Summary
4,978
202
50
30
135
4,978
202
50
30
135

Anthony

6 years of experience
18 reviews
Anthony
6 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Carmichael, California
Anthony was great! We are very happy that we chose to go with this company instead of the overpriced and slow service we get from the Jeep dealership. He was on time and did the job just as expected. He identified a couple of other things that need to be done before the problems get worse. We appreciate having a technician give us direct feedback regarding our vehicle, rather than a service advisor (salesperson) that we've had to deal with in the past at the dealership. We'll be booking the addtional services very soon and will definitely request Anthony again now that he is familiar with our vehicle!

Michael

37 years of experience
113 reviews
Michael
37 years of experience
Subaru Forester - Check Engine Light is on - Santa Fe Springs, California
Michael was punctual and courteous. He knows what he’s doing and I would absolutely recommend him to anyone.

Anthony

6 years of experience
18 reviews
Anthony
6 years of experience
BMW 740Li - Check Engine Light is on - Roseville, California
Very helpful in finding out the fault codes in my bmw 740 li. It was simple fix and that the two tube hose just had to be connected and my drive train malfunction went away. This saved me from having to go the an expensive dealership. Anthony has a good attitude about his work.

Breck

19 years of experience
613 reviews
Breck
19 years of experience
Ram 1500 - Check Engine Light is on - Houston, Texas
Breck did a great job working on my truck. Showed up on time, found any issues I had on my truck and explained everything to me so that I understood what was going on. Went above and beyond, definitely will book him for future appointments.


More related articles

P0575 OBD-II Trouble Code: Cruise Control Input Circuit
P0575 code means that the control input circuit is suffering from an electrical malfunction often due too a faulty, cruise control switch or wires.
P0514 OBD-II Trouble Code: Battery Temperature Sensor Circuit Range/Performance
What What the P0514 code means The P0514 code indicates that there is a malfunction in the battery temperature sensor. What causes the P0514 code? There may be one or more causes for the P0514 code. One may be...
P2023 OBD-II Trouble Code: Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 2
P2023 means the intake manifold runner control circuit in bank 2 is problematic. This could be due to a damaged component, especially in a sensor.

Related questions

I think that my car has thrown a rod - 2006 Pontiac Torrent

Hi there. If you noticed a large hole on the side of the engine's block and it's leaking a lot of oil, it is highly likely that a connecting rod snapped and "windowed" the block. Unfortunately, there is no repair...

Why can't i fix O2 sensor problem

In many circumstances, the O2 sensors are not the only culprit of a lean fuel curve. In many cases, a clogged fuel injector nozzle can also trigger the most common OBD-II error code (P-2191) that indicates a lean condition exists....

Check engine light

Without additional detail as to the symptoms of the car and how it is running, this may be difficult to diagnose. The coolant temperature sensor is generally something that when not working properly, will cause the car to run hot....

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com