AutoCodes – Buick – U0103 Buick

U0103 Buick Code - Lost Communication With Shift Lever 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 Shift Lever Module, Shift Lever Module harness is open or shorted, Shift Lever 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: U0103 Buick indicates Lost Communication With Shift Lever Module.
Common causes: Common causes include Faulty Shift Lever Module, Shift Lever Module harness is open or shorted, Shift Lever 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 703

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 Mar 30, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0103 Buick 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 Shift Lever Module has not been received.

OBDII Code U0103 Buick - Lost Communication With Shift Lever Module - AutoCodes.com — U0103 Buick Code - Lost Communication With Shift Lever Module

What does this mean?

What are the Possible Causes of the DTC U0103 Buick?

Faulty Shift Lever Module
Shift Lever Module harness is open or shorted
Shift Lever Module circuit poor electrical connection

How to Fix the DTC U0103 Buick?

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 U0103 Buick 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 U0103 Buick Code

1. What are the common symptoms of OBDII code U0103 in a Buick related to lost communication with the shift lever module?

- Common symptoms include issues with gear shifting, transmission problems, and potential warning lights on the dashboard.

2. What are the possible causes of OBDII code U0103 indicating lost communication with the shift lever module in a Buick?

- Possible causes may include wiring issues, a faulty shift lever module, a defective transmission control module (TCM), or a communication network problem.

3. How can I diagnose the OBDII code U0103 in my Buick that is showing a lost communication error with the shift lever module?

- Diagnose the code by checking the wiring harness for damage, inspecting the shift lever module for functionality, and performing a scan of the TCM for any related error codes.

4. Are there any specific repair tips for addressing OBDII code U0103 in a Buick related to communication loss with the shift lever module?

- Repair tips may include checking and repairing any damaged wiring, replacing the shift lever module if necessary, and reprogramming or replacing the TCM.

5. Can OBDII code U0103 in a Buick indicating lost communication with the shift lever module be fixed at home, or is it recommended to seek professional help?

- Depending on the underlying cause, some DIY fixes are possible, but complex issues may require the expertise of a professional mechanic with experience in diagnosing transmission-related problems.

6. Will driving my Buick with the OBDII code U0103 related to lost communication with the shift lever module cause further damage?

- Continuing to drive with this code may lead to performance issues, potential transmission problems, and could worsen the underlying communication fault over time.

7. How much can I expect to pay for repairs related to OBDII code U0103 in a Buick due to lost communication with the shift lever module?

- The cost of repairs can vary depending on the specific issue, but it is recommended to budget for diagnostic fees, possible part replacements, and labor costs, which can range from a few hundred to over a thousand dollars.

8. Are there any recalls or technical service bulletins (TSBs) related to OBDII code U0103 in Buick vehicles regarding lost communication with the shift lever module?

- It is advisable to check with Buick dealerships or online databases for any existing recalls or TSBs related to this specific OBDII code to see if your vehicle may be covered for repairs.

9. Can a weak or failing car battery contribute to triggering OBDII code U0103 in a Buick due to lost communication with the shift lever module?

- Yes, a weak or failing car battery can potentially impact the communication network within the vehicle, leading to errors like U0103. It is recommended to ensure the battery is in good condition as part of the troubleshooting process.

10. Is it safe to drive my Buick if the OBDII code U0103 for lost communication with the shift lever module has been temporarily cleared or reset?

- Clearing the code temporarily may reset the system, but it is important to address the root cause of the communication loss promptly to prevent further issues. It is not advisable to ignore the problem and continue driving without proper diagnosis and repair.