AutoCodes – GMC – U2609 GMC

U2609 GMC Code - Battery Charger 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 Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain 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: U2609 GMC indicates Battery Charger Control Module Lost Communication With Hybrid/EV Powertrain Control Module.
Common causes: Common causes include Faulty Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain 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 766

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 U2609 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 U2609 GMC - Battery Charger Control Module Lost Communication With Hybrid/EV Powertrain Control Module - AutoCodes.com — U2609 GMC Code - Battery Charger Control Module Lost Communication With Hybrid/EV Powertrain Control Module

What does this mean?

What are the Possible Causes of the DTC U2609 GMC?

Faulty Hybrid/EV Powertrain Control Module
Hybrid/EV Powertrain Control Module harness is open or shorted
Hybrid/EV Powertrain Control Module circuit poor electrical connection
Faulty Battery Charger Control Module

How to Fix the DTC U2609 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 U2609 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 U2609 GMC Code

1. What are the common symptoms of OBDII code U2609 in a GMC vehicle?

- Common symptoms include the check engine light coming on, poor hybrid system performance, and potential issues with the battery charging system.

2. What can cause the OBDII code U2609 in a GMC to appear?

- The code may be triggered by a communication failure between the Battery Charger Control Module and the Hybrid/EV Powertrain Control Module, usually due to a wiring issue or a faulty module.

3. How can I diagnose the cause of code U2609 in my GMC vehicle?

- Diagnosing this code typically involves checking the wiring connections between the Battery Charger Control Module and the Hybrid/EV Powertrain Control Module, as well as testing the modules themselves for faults.

4. Is it safe to continue driving my GMC with code U2609 present?

- It is generally not recommended to drive the vehicle with this code present, as it can affect the performance of the hybrid system and potentially lead to further issues with the charging system.

5. How can I repair OBDII code U2609 in my GMC?

- Repair options may include fixing any wiring issues, replacing damaged modules, or reprogramming the modules to restore communication between them.

6. Can a DIY enthusiast fix OBDII code U2609, or should I take my GMC to a professional mechanic?

- While some basic checks like inspecting wiring connections can be done by a DIY enthusiast, diagnosing and repairing this code often requires specialized tools and expertise, so it is recommended to consult a professional mechanic.

7. How much does it typically cost to repair OBDII code U2609 in a GMC?

- The cost of repair can vary depending on the underlying issue, but it may involve expenses for parts replacement, labor, and diagnostic services, potentially ranging from a few hundred to over a thousand dollars.

8. Will resetting the fault codes make OBDII code U2609 disappear permanently?

- Simply resetting the fault codes may temporarily clear the check engine light, but if the underlying issue causing code U2609 is not addressed, the code is likely to reappear after driving the vehicle for some time.

9. What are the long-term effects of ignoring OBDII code U2609 in a GMC?

- Ignoring this code can lead to continued issues with the hybrid system, decreased fuel efficiency, and potential damage to the vehicle's battery charging system, which may result in more costly repairs down the line.

10. Is there a way to prevent OBDII code U2609 from reoccurring in my GMC vehicle?

- Regular maintenance, including checking and maintaining the electrical connections in the charging system, can help prevent code U2609 from reoccurring. Additionally, addressing any related issues promptly can reduce the likelihood of the code appearing again.