AutoCodes – Chevrolet – U0103 Chevrolet

U0103 Chevrolet 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 Chevrolet 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 851

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

What does this mean?

What are the Possible Causes of the DTC U0103 Chevrolet?

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 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 U0103 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 U0103 Chevrolet code? Get Access to Factory Service Manuals

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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 Chevrolet Code

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

- Common symptoms include the inability to shift gears, the gear indicator not displaying correctly, and warning lights on the dashboard related to the transmission system.

2. What are the possible causes of OBDII code U0103 in a Chevrolet?

- Possible causes may include a faulty shift lever module, damaged wiring or connectors in the communication circuit, or issues with the powertrain control module (PCM).

3. How can I diagnose the issue related to OBDII code U0103 in my Chevrolet?

- Diagnosis typically involves checking the communication circuit for continuity, inspecting the shift lever module and related components for damage, and using a scan tool to communicate with the affected module.

4. Can I drive my Chevrolet with OBDII code U0103 present?

- It is not recommended to drive your vehicle with this code present, as it can lead to potential safety hazards due to the loss of communication with the shift lever module.

5. How can I repair OBDII code U0103 in my Chevrolet?

- Repairing this code often involves addressing the root cause, such as replacing a faulty shift lever module, repairing damaged wiring or connectors, or reprogramming the PCM if necessary.

6. Is it possible to reset the OBDII code U0103 in my Chevrolet without fixing the underlying issue?

- While you can clear the code with a scan tool, it is important to address the underlying problem causing the lost communication with the shift lever module to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code U0103 in a Chevrolet?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve parts replacement, labor costs, and potentially diagnostic fees from a mechanic or dealership.

8. Can a DIY enthusiast fix OBDII code U0103 in a Chevrolet?

- Depending on your automotive repair skills and access to tools, some DIY enthusiasts may be able to diagnose and repair this code themselves, especially if the issue is related to wiring or connectors.

9. Are there any recalls or technical service bulletins related to OBDII code U0103 in Chevrolet vehicles?

- It is advisable to check with a Chevrolet dealership or online databases to see if there are any relevant recalls or technical service bulletins addressing this specific OBDII code and related issues.

10. How can I prevent OBDII code U0103 from occurring in my Chevrolet in the future?

- Regular maintenance, including checking the wiring and connectors in the communication circuit, can help prevent issues leading to lost communication with the shift lever module and the associated OBDII code.