AutoCodes – GMC – P2637 GMC

P2637 GMC Code - Torque Management Feedback Signal 'A'

Quick Answer

To improve shift, feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), Engine Control Module software update. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2637 GMC indicates Torque Management Feedback Signal 'A'.
Common causes: Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), Engine Control Module software update.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,744

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 08, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2637 GMC Description

To improve shift, feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding the base ignition timing and notifying the TCM that the request has succeeded. If the ECM cannot comply with the request, the ECM sends the TCM a message that the request has failed.
The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM.
A fault in the CAN will not cause the ECM to set the Diagnostic Trouble Codes (DTC). Other DTCs will be set before this code if a CAN fault occurs.
The ECM sets the OBDII code when the TCM receives a torque reduction failure message from the ECM.

OBDII Code P2637 GMC - Torque Management Feedback Signal 'A' - AutoCodes.com — P2637 GMC Code - Torque Management Feedback Signal 'A'

What does this mean?

What are the Possible Causes of the DTC P2637 GMC?

Faulty Engine Control Module (ECM)
Faulty Transmission Control Module (TCM)
Engine Control Module software update
Transmission Control Module software update
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC P2637 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2637 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2637 GMC code?

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2637 GMC Code

1. What are the common symptoms of OBDII code P2637 GMC?

The common symptoms of code P2637 Torque Management Feedback Signal 'A' in a GMC vehicle include reduced engine performance, rough idling, and potential stalling.

2. What are the possible causes of OBDII code P2637 GMC?

Possible causes of code P2637 in a GMC vehicle include a faulty torque management feedback signal sensor, damaged wiring or connectors in the feedback signal circuit, or issues with the powertrain control module (PCM).

3. How serious is OBDII code P2637 in a GMC vehicle?

Code P2637 may not cause immediate harm to your vehicle, but it can affect engine performance and fuel efficiency. It is recommended to address this issue promptly to prevent further damage.

4. Can I drive my GMC with OBDII code P2637?

It is not advisable to drive your GMC with an unresolved OBDII code P2637, as it can lead to potential engine performance issues or stalling while driving.

5. How can I diagnose OBDII code P2637 in my GMC vehicle?

Diagnosing code P2637 typically involves using an OBDII scanner to read the fault codes, testing the torque management feedback signal sensor, inspecting the wiring and connectors in the circuit, and checking the PCM for any faults.

6. How much does it cost to repair OBDII code P2637 in a GMC vehicle?

The cost of repairing OBDII code P2637 in a GMC vehicle can vary depending on the underlying cause. It may involve replacing the torque management feedback signal sensor, repairing wiring issues, or reprogramming the PCM, with costs ranging from $100 to $500 or more.

7. Can I reset OBDII code P2637 in my GMC without fixing the issue?

Resetting the OBDII code P2637 in your GMC without addressing the underlying problem will only temporarily clear the fault code. The issue will likely reappear once the root cause is not resolved.

8. How can I prevent OBDII code P2637 from occurring in my GMC?

To prevent OBDII code P2637 in your GMC, it is essential to perform regular maintenance checks, such as inspecting wiring harnesses for damage and ensuring proper sensor functioning during routine servicing.

9. Is it safe to ignore OBDII code P2637 in my GMC?

While you may still drive your GMC with the code present, ignoring OBDII code P2637 can lead to decreased engine performance and potential stalling, posing a risk to your safety and the health of your vehicle.

10. Can a DIY enthusiast repair OBDII code P2637 in a GMC?

DIY enthusiasts may be able to repair OBDII code P2637 in a GMC if they have the necessary tools, knowledge, and experience. However, it is recommended to consult a professional mechanic for a proper diagnosis and repair to ensure the issue is resolved effectively.