P2642 GMC Code - Torque Management Feedback Signal 'B' Range/Performance
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 (ECM) 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
- P2642 GMC indicates Torque Management Feedback Signal 'B' Range/Performance.
- Common causes
- Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), Engine Control Module (ECM) 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.
Code P2642 GMC Description
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). If a CAN fault occurs, other DTCs will set before this code.
The ECM set the OBDII code when the TCM receives a torque reduction failure message from the ECM.
What are the Possible Causes of the DTC P2642 GMC?
- Faulty Engine Control Module (ECM)
- Faulty Transmission Control Module (TCM)
- Engine Control Module (ECM) software update
- Transmission Control Module (TCM) software update
- Engine Control Module (ECM) harness is open or shorted
- Engine Control Module (ECM) circuit poor electrical connection
How to Fix the DTC P2642 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 P2642 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.
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Frequently Asked Questions about P2642 GMC Code
1. What are the common symptoms of OBDII code P2642 in a GMC vehicle?
- Common symptoms include poor engine performance, reduced power, rough idling, and illuminated check engine light.
2. What does the OBDII code P2642 in a GMC indicate?
- The code P2642 indicates a problem with the Torque Management Feedback Signal 'B' Range/Performance in the vehicle's engine control module.
3. What are the possible causes of OBDII code P2642 in a GMC?
- Possible causes include a faulty torque management feedback signal sensor, wiring issues, a defective engine control module, or a problem with the torque management system itself.
4. How can I diagnose the OBDII code P2642 in my GMC?
- To diagnose the code, you can use an OBDII scanner to retrieve the trouble codes and perform a visual inspection of the wiring and connectors related to the torque management feedback signal sensor.
5. Can I continue driving my GMC with the OBDII code P2642 present?
- It is not recommended to drive the vehicle with the code present, as it can lead to further engine damage and poor performance.
6. How can I repair OBDII code P2642 in my GMC?
- Repairing the code typically involves replacing the faulty torque management feedback signal sensor, repairing any damaged wiring, or reprogramming the engine control module.
7. Is it possible to reset the OBDII code P2642 in a GMC without fixing the underlying issue?
- While you can clear the code with an OBDII scanner, it is important to address the root cause of the problem to prevent the code from reappearing.
8. Are there any DIY tips for fixing OBDII code P2642 in a GMC?
- DIY tips include checking the sensor connections, inspecting the wiring for damage, and ensuring proper installation of any replacement components.
9. Can a mechanic help me fix OBDII code P2642 in my GMC?
- Yes, a qualified mechanic can diagnose and repair the issue causing the code P2642 in your GMC to ensure proper functioning of the torque management feedback system.
10. How much does it cost to repair OBDII code P2642 in a GMC?
- The cost of repair can vary depending on the specific cause of the issue, but it may involve parts replacement and labor costs ranging from $200 to $500 or more.
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