AutoCodes – Generic – U2611

U2611 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 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 854

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

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?

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 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 U2611 code?

Need more information on how to fix the U2611 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2611 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2611 Buick — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module
U2611 Cadillac — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module
U2611 Chevrolet — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module
U2611 GMC — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module

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 Code

1. What are the common symptoms of OBDII code U2611?

The common symptoms of OBDII code U2611 include transmission shifting issues, reduced fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of code U2611?

The possible causes of OBDII code U2611 include a faulty auxiliary transmission fluid pump control module, a malfunctioning hybrid/EV powertrain control module, wiring issues, or poor electrical connections.

3. How can I diagnose OBDII code U2611?

Diagnosing OBDII code U2611 requires using a diagnostic scanner to retrieve the code and investigate the communication between the auxiliary transmission fluid pump control module and the hybrid/EV powertrain control module.

4. Can I still drive my vehicle with code U2611?

It is not recommended to drive your vehicle with OBDII code U2611 present, as it can lead to further damage to the transmission system and potentially affect the performance of your vehicle.

5. How can I repair OBDII code U2611?

Repairing OBDII code U2611 involves addressing the root cause of the communication loss between the auxiliary transmission fluid pump control module and the hybrid/EV powertrain control module, which may include replacing faulty modules or repairing wiring issues.

6. Is it safe to continue driving if the Check Engine Light is on due to code U2611?

Driving with the Check Engine Light on due to code U2611 is not recommended, as it indicates a potential issue with the transmission system that requires attention to prevent further damage.

7. How much does it cost to fix OBDII code U2611?

The cost of fixing OBDII code U2611 can vary depending on the underlying cause of the communication loss, the extent of the repair needed, and labor costs at the repair shop. It is best to consult a professional for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code U2611 at home?

While some DIY enthusiasts may be able to diagnose and repair OBDII code U2611 at home, it is recommended to seek professional help, especially when dealing with complex transmission and control module issues.

9. Will resetting the Check Engine Light make code U2611 disappear?

Resetting the Check Engine Light may temporarily make the light disappear, but it will not fix the underlying issue causing OBDII code U2611. It is important to address the root cause of the problem to prevent further issues.

10. How can I prevent OBDII code U2611 from occurring?

To prevent OBDII code U2611, it is important to maintain your vehicle regularly, address any transmission or control module issues promptly, and ensure proper electrical connections to avoid communication errors between modules.