AutoCodes – GMC – U0201 GMC

U0201 GMC Code - Lost Communication With Transfer Case Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) 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: U0201 GMC 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 591

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 Apr 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U0201 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) 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, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Transfer Case Control Module has not been received.

OBDII Code U0201 GMC - Lost Communication With Transfer Case Control Module - AutoCodes.com — U0201 GMC Code - Lost Communication With Transfer Case Control Module

What does this mean?

What are the Possible Causes of the DTC U0201 GMC?

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 U0201 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 U0201 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.

Need more information about the U0201 GMC code?

Need more information on how to fix the U0201 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0201 GMC 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 U0201 GMC Code

1. What are common symptoms of OBDII code U0201 in a GMC vehicle?

- Common symptoms include the inability to shift gears, loss of four-wheel drive functionality, and dashboard warning lights related to the transfer case.

2. What can cause the OBDII code U0201 (Lost Communication With Transfer Case Control Module) in a GMC?

- The code can be triggered by issues such as a faulty transfer case control module, damaged wiring or connectors, low battery voltage, or a software glitch.

3. How can I diagnose the OBDII code U0201 in my GMC related to the transfer case control module?

- Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking the transfer case control module for power and ground, inspecting wiring for damage, and testing for communication signals.

4. Is it safe to continue driving with the OBDII code U0201 indicating a lost communication with the transfer case control module in a GMC vehicle?

- It is not recommended to continue driving with this code present, as it may lead to further damage to the transfer case system and compromise vehicle safety.

5. Can I reset the OBDII code U0201 in my GMC without addressing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause to prevent the code from reoccurring and ensure proper functionality of the transfer case.

6. How much does it typically cost to repair the OBDII code U0201 related to the transfer case control module in a GMC?

- Repair costs can vary depending on the specific issue, but they may range from $200 to $600 or more, including parts and labor.

7. Are there any DIY repair tips for fixing the OBDII code U0201 in a GMC?

- DIY enthusiasts can start by checking for loose connections, inspecting wiring for damage, and ensuring the transfer case control module is securely in place before considering professional help.

8. Can extreme weather conditions affect the likelihood of triggering the OBDII code U0201 in a GMC?

- Yes, extreme temperatures or moisture can sometimes cause electrical issues that lead to communication problems with the transfer case control module, triggering the U0201 code.

9. How long does it typically take to repair the OBDII code U0201 related to the transfer case control module in a GMC?

- Repair times can vary based on the specific issue and the expertise of the mechanic, but most repairs related to the U0201 code can be completed within a few hours to a day.

10. Is it necessary to visit a dealership for repairs related to the OBDII code U0201 in a GMC, or can an independent mechanic handle the job?

- Independent mechanics with experience in diagnosing and repairing transfer case control module issues can typically address the U0201 code effectively, potentially offering more cost-effective solutions compared to dealership services.