AutoCodes – Chevrolet – U1026 Chevrolet

U1026 Chevrolet 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 Chevrolet 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 15,135

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

What does this mean?

What are the Possible Causes of the DTC U1026 Chevrolet?

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 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 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 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.

Need more information about the U1026 Chevrolet code?

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Need Help with the Code?

Get the U1026 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

U1026 2014 Chevrolet Silverado — Lost Communication with Transfer Case Control Module
U1026 2015 Chevrolet Silverado — Lost Communication with Transfer Case Control Module
U1026 2016 Chevrolet Silverado — Lost Communication with Transfer Case Control Module
U1026 2017 Chevrolet Silverado — Lost Communication with Transfer Case Control Module
U1026 2018 Chevrolet Silverado — Lost Communication with Transfer Case 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 U1026 Chevrolet Code

1. What are the common symptoms of OBDII code U1026 (Lost Communication with Transfer Case Control Module)?

- Common symptoms include the inability to shift gears, 4WD system malfunctions, and dashboard warning lights related to the transfer case.

2. What are some possible causes of code U1026 in a Chevrolet vehicle?

- Possible causes may include a faulty transfer case control module, damaged wiring or connectors, low battery voltage, or communication bus issues.

3. How can I diagnose the U1026 trouble code in my Chevrolet for the Lost Communication with Transfer Case Control Module?

- Diagnosis typically involves using a scan tool to retrieve the code, checking for related codes, inspecting wiring and connectors, and testing the transfer case control module.

4. Is it safe to continue driving with the U1026 code present?

- It is not recommended to continue driving with the U1026 code as it may affect the transfer case operation, potentially leading to safety hazards or further damage.

5. Can I reset the U1026 code in my Chevrolet without addressing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of the communication loss to prevent the code from reoccurring.

6. Are there any DIY repair tips for resolving the U1026 code in a Chevrolet?

- DIY repair tips may include checking and repairing damaged wiring, ensuring proper battery voltage, and reprogramming or replacing the transfer case control module if necessary.

7. How much does it typically cost to repair the U1026 code in a Chevrolet at a professional auto repair shop?

- Repair costs for the U1026 code can vary depending on the specific issue, but it may range from $200 to $500 or more, including parts and labor.

8. Can the U1026 code be triggered by external factors like extreme weather conditions?

- Yes, extreme weather conditions such as heavy rain or snow may impact the transfer case control module's communication, leading to the U1026 trouble code.

9. Will disconnecting the battery reset the U1026 code in a Chevrolet?

- Disconnecting the battery may clear the code temporarily, but it is essential to address the underlying issue to prevent the code from reappearing.

10. Is the U1026 code specific to Chevrolet vehicles, or can it occur in other car makes and models?

- The U1026 code is specific to Chevrolet vehicles, but similar communication loss codes may exist in other car makes and models with transfer case control modules.