AutoCodes – GMC – U2611 GMC

U2611 GMC Code - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Auxiliary Transmission Fluid Pump Control Module, Auxiliary Transmission Fluid Pump Control Module harness is open or shorted, Auxiliary Transmission Fluid Pump Control Module circuit poor electrical connection. 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: U2611 GMC indicates Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module.
Common causes: Common causes include Faulty Auxiliary Transmission Fluid Pump Control Module, Auxiliary Transmission Fluid Pump Control Module harness is open or shorted, Auxiliary Transmission Fluid Pump Control Module circuit poor electrical connection.
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 606

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 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2611 GMC Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device.
This diagnostic is used to check the loss of communication with the Hybrid/EV Powertrain Control Module on a high-speed General Motors Local Area Network (GMLAN) bus. The Battery Energy Control Module supervises a periodic serial data message to check the communication status of the Hybrid/EV Powertrain Control Module. If this message is not received within 400 ms, the Battery Energy Control Module increases its fail count. When this fail count is over X Cal Value (7) during Y Cal Value (10 samples), the diagnostic status of this code is set to Failed and transmitted over high voltage energy high-speed GMLAN bus to the Hybrid/EV Powertrain Control Module.
The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received within 400 ms.

OBDII Code U2611 GMC - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module - AutoCodes.com — U2611 GMC Code - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module

What does this mean?

What are the Possible Causes of the DTC U2611 GMC?

Faulty Auxiliary Transmission Fluid Pump Control Module
Auxiliary Transmission Fluid Pump Control Module harness is open or shorted
Auxiliary Transmission Fluid Pump Control Module circuit poor electrical connection
Faulty Hybrid/EV Powertrain Control Module

How to Fix the DTC U2611 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 U2611 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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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 U2611 GMC Code

1. What are common symptoms of OBDII code U2611 in a GMC vehicle?

- Common symptoms include transmission shifting issues, inability to switch gears smoothly, and warning lights on the dashboard related to the transmission system.

2. What can cause the OBDII code U2611 in a GMC vehicle?

- The code U2611 is triggered when there is a communication failure between the Auxiliary Transmission Fluid Pump Control Module and the Hybrid/EV Powertrain Control Module. This can be caused by wiring issues, faulty modules, or software malfunctions.

3. How can I diagnose the OBDII code U2611 in my GMC vehicle?

- Diagnosing the code U2611 typically involves using a professional OBDII scanner to read the fault codes, checking the wiring connections between the control modules, and performing a communication test to identify the source of the issue.

4. Can I continue driving my GMC vehicle with the OBDII code U2611 present?

- It is not recommended to continue driving with the U2611 code present, as it can lead to further transmission problems and potentially cause damage to other components. It is best to address the issue promptly.

5. How can I repair the OBDII code U2611 in my GMC vehicle?

- Repairing the U2611 code may involve fixing wiring issues, replacing faulty control modules, updating software, or reprogramming the modules to restore proper communication between the components.

6. Is it possible to reset the OBDII code U2611 in a GMC vehicle without fixing the underlying issue?

- While you can clear the fault code temporarily, it is not recommended to reset the code without addressing the root cause. The issue will likely persist, and the code will reappear until the problem is resolved.

7. Are there any recalls or service bulletins related to the OBDII code U2611 in GMC vehicles?

- It's advisable to check with a GMC dealership or online resources to see if there are any recalls or service bulletins related to the U2611 code in your specific vehicle model.

8. Can a DIY enthusiast fix the OBDII code U2611 issue in a GMC vehicle?

- Depending on your skills and tools available, some DIY enthusiasts may be able to diagnose and repair the U2611 code. However, complex electrical issues may require professional assistance.

9. How long does it typically take to repair the OBDII code U2611 in a GMC vehicle?

- The repair time for the U2611 code can vary based on the specific cause of the issue. Simple fixes like checking wiring connections may take a short time, while replacing control modules or performing software updates may require more time.

10. Will fixing the OBDII code U2611 improve the overall performance of my GMC vehicle?

- Yes, addressing the U2611 code can help restore proper transmission function and communication between control modules, leading to improved overall performance and reliability of your GMC vehicle.