AutoCodes – Chevrolet – U2109 Chevrolet

U2109 Chevrolet Code - Lost Communications With Powertrain Multiple Control System

Quick Answer

Modules connected to the Controller Area Network (CAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Powertrain Multiple Control System, Powertrain Multiple Control System harness is open or shorted, Powertrain Multiple Control System 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: U2109 Chevrolet indicates Lost Communications With Powertrain Multiple Control System.
Common causes: Common causes include Faulty Powertrain Multiple Control System, Powertrain Multiple Control System harness is open or shorted, Powertrain Multiple Control System 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 4,394

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 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2109 Chevrolet Description

Modules connected to the Controller Area Network (CAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module. A module with a CAN serial data circuits malfunction or which loses power during the current ignition cycle will have a Loss of Communication Diagnostic Trouble Code (DTC) set by other modules that depend on information from that failed module. If any of the CAN circuit are shorted to battery voltage, ground, or between them no communication is possible on the CAN serial data bus, a Diagnostic Trouble Code will set.

OBDII Code U2109 Chevrolet - Lost Communications With Powertrain Multiple Control System - AutoCodes.com — U2109 Chevrolet Code - Lost Communications With Powertrain Multiple Control System

What does this mean?

What are the Possible Causes of the DTC U2109 Chevrolet?

Faulty Powertrain Multiple Control System
Powertrain Multiple Control System harness is open or shorted
Powertrain Multiple Control System circuit poor electrical connection

How to Fix the DTC U2109 Chevrolet?

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 U2109 Chevrolet 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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Need more information on how to fix the U2109 Chevrolet code? Get Access to Factory Service Manuals

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Get the U2109 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 U2109 Chevrolet Code

1. What are common symptoms of the U2109 OBDII code in a Chevrolet vehicle?

- Common symptoms include check engine light illumination, failure of multiple control systems, and issues with powertrain functionality.

2. What are the potential causes of the U2109 OBDII code in a Chevrolet vehicle?

- The code U2109 is typically triggered by communication errors between various control modules in the powertrain system, such as faulty wiring connections, damaged control modules, or software glitches.

3. How can I diagnose the U2109 OBDII code in my Chevrolet vehicle?

- Diagnosis of the U2109 code involves using an OBDII scanner to retrieve the code, checking for other related codes, inspecting wiring connections, and performing communication tests between control modules.

4. Are there any common repair tips for addressing the U2109 OBDII code in a Chevrolet vehicle?

- Common repair tips include checking and repairing damaged wiring connections, replacing faulty control modules, updating software, and ensuring proper communication between control systems.

5. Can driving with the U2109 OBDII code cause further damage to my Chevrolet vehicle?

- Continuing to drive with the U2109 code may lead to further malfunctions in the powertrain system and potentially cause damage to control modules or other components. It is advisable to address the issue promptly.

6. How much does it typically cost to repair the U2109 OBDII code in a Chevrolet vehicle?

- The cost of repairing the U2109 code can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor costs, and diagnostic fees. It is recommended to consult a professional mechanic for an accurate estimate.

7. Can I reset the U2109 OBDII code in my Chevrolet vehicle using a simple reset tool?

- While resetting the code with a basic OBDII reset tool may temporarily clear the code, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Does the U2109 OBDII code in a Chevrolet vehicle affect the vehicle's performance?

- The U2109 code can impact the performance of a Chevrolet vehicle by causing communication errors between control systems, leading to potential issues with powertrain operation, fuel efficiency, and overall driving experience.

9. Are there any recalls or technical service bulletins related to the U2109 OBDII code in Chevrolet vehicles?

- It is recommended to check with Chevrolet dealerships or online resources for any recalls or technical service bulletins related to the U2109 code in specific Chevrolet models to stay informed on potential solutions or updates.

10. Can I prevent the U2109 OBDII code from occurring in my Chevrolet vehicle?

- While some causes of the U2109 code may be unavoidable, regular maintenance, prompt addressing of communication issues, and keeping control modules updated can help reduce the likelihood of the code appearing in a Chevrolet vehicle.