AutoCodes – Chevrolet – U1026 2017 Chevrolet Silverado

U1026 2017 Chevrolet Silverado Code - Lost Communication with Transfer Case Control Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted, Transfer Case 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: U1026 2017 Chevrolet Silverado indicates Lost Communication with Transfer Case Control Module.
Common causes: Common causes include Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted, Transfer Case 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 254

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 Jul 21, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1026 2017 Chevrolet Silverado 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. The Diagnostic Trouble Code (DTC) will be set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U1026 2017 Chevrolet Silverado - Lost Communication with Transfer Case Control Module - AutoCodes.com — U1026 2017 Chevrolet Silverado Code - Lost Communication with Transfer Case Control Module

What does this mean?

What are the Possible Causes of the DTC U1026 2017 Chevrolet Silverado?

Faulty Transfer Case Control Module
Transfer Case Control Module harness is open or shorted
Transfer Case Control Module circuit poor electrical connection

How to Fix the DTC U1026 2017 Chevrolet Silverado?

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 does this mean?

Code Tech Notes

This is typically an electrical wiring connection issue at one of the controllers being monitored by the manufacturer.
It can occur if:
Someone changes a battery while the ignition switch is left on, that is, left in the Run position.
Someone flashes/upgrades their engine controller - other modules unable to communicate with PCM during this process - this will set U1026 at a multitude of controllers on the vehicle - all false codes. Erase and carry on.
May need to disconnect both battery cables and touch them together for 15 seconds. Reattach battery cables, positive first, then negative and see if a soft reset helps.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1026 2017 Chevrolet Silverado 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 U1026 2017 Chevrolet Silverado code?

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Need Help with the Code?

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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 U1026 2017 Chevrolet Silverado Code

1. What does OBDII code U1026 on a 2017 Chevrolet Silverado mean?

This code, "U1026 Lost Communication with Transfer Case Control Module," indicates a communication problem between the vehicle's engine control module (ECM) and the transfer case control module.

2. What are the common symptoms of U1026 code in a 2017 Chevrolet Silverado?

Common symptoms of U1026 code include the Service 4WD warning light on the dashboard, issues with shifting into 4WD modes, and potential loss of control over the vehicle's transfer case functions.

3. What are the possible causes of U1026 code in a 2017 Chevrolet Silverado?

Possible causes of U1026 code include damaged wiring or connectors between the ECM and transfer case control module, a faulty transfer case control module, or a malfunctioning ECM.

4. How can I diagnose the U1026 code on my 2017 Chevrolet Silverado?

Diagnosing the U1026 code typically involves using a diagnostic scan tool to retrieve the code, checking the wiring and connectors for any visible damage, and conducting a thorough inspection of the transfer case control module and ECM.

5. Can I still drive my 2017 Chevrolet Silverado with the U1026 code?

It is not recommended to continue driving your vehicle with the U1026 code present, as it can lead to potential safety hazards and further damage to the transfer case system. It's best to address the issue promptly.

6. How can I repair the U1026 code on my 2017 Chevrolet Silverado?

Repairing the U1026 code may involve repairing or replacing damaged wiring and connectors, replacing the transfer case control module or ECM if necessary, and clearing the code with a diagnostic tool after the repairs are completed.

7. Is it possible to reset the U1026 code on a 2017 Chevrolet Silverado without fixing the underlying issue?

While you can clear the U1026 code with a diagnostic scan tool, it is crucial to address the underlying communication problem between the ECM and transfer case control module to prevent the code from reoccurring.

8. Are there any recalls or technical service bulletins related to the U1026 code in a 2017 Chevrolet Silverado?

It's advisable to check with a Chevrolet dealership or online resources for any recalls or technical service bulletins related to the U1026 code on your specific vehicle model and year.

9. How much does it typically cost to repair the U1026 code on a 2017 Chevrolet Silverado?

The cost of repairing the U1026 code can vary depending on the underlying issue, parts needed for replacement, and labor costs. It's recommended to obtain quotes from reputable mechanics or dealerships for an accurate estimate.

10. Can a DIY enthusiast fix the U1026 code on a 2017 Chevrolet Silverado?

While some experienced DIY enthusiasts may be able to diagnose and repair the U1026 code themselves, it's crucial to have the necessary tools, knowledge, and skills to work on complex electronic systems like the transfer case control module and ECM. If unsure, seeking professional help is recommended.