Engine-Codes - Generic - U2611

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

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

U2611 Possible Causes

  • 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 is the U2611 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the U2611 code

Labor: 1.0

The cost to diagnose the U2611 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

U2611 Meaning

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.

More Information

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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

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