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U0103 Chevrolet Code - Lost Communication With Shift Lever Module

Quick Answer

The U0103 code for Chevrolet vehicles indicates that there is a communication error between the vehicle's engine control module (ECM) and the shift lever module. Common causes include Faulty wiring or connectors between the ECM and shift lever module, Malfunctioning shift lever module, Issues with the ECM. 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 wiring or connectors between the ECM and shift lever module, Malfunctioning shift lever module, Issues with the ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code U0103 Chevrolet Description

The U0103 code for Chevrolet vehicles indicates that there is a communication error between the vehicle's engine control module (ECM) and the shift lever module. The shift lever module is responsible for controlling the transmission gear selection and sending signals to the ECM to ensure proper shifting. When communication is lost between these two modules, it can lead to issues with the transmission's performance and overall drivability of the vehicle.

OBDII Code U0103 Chevrolet - Lost Communication With Shift Lever Module
U0103 Chevrolet Code - Lost Communication With Shift Lever Module

Common Causes of U0103 Chevrolet

  1. Faulty wiring or connectors between the ECM and shift lever module
  2. Malfunctioning shift lever module
  3. Issues with the ECM
  4. Corrosion or damage to wiring harnesses
  5. Electrical interference or signal loss

Symptoms of U0103 Chevrolet

  1. Erratic shifting behavior
  2. Transmission getting stuck in a single gear
  3. Harsh shifting or jerking when changing gears
  4. Reduced fuel efficiency
  5. Check Engine Light illuminated

How to Fix U0103 Chevrolet

  1. Begin by conducting a thorough inspection of the wiring harnesses and connectors between the ECM and shift lever module to check for any visible damage or corrosion.
  2. Use a multimeter to test the continuity and resistance of the wiring to ensure proper electrical connections.
  3. If wiring and connectors are in good condition, proceed to test the shift lever module and ECM for proper functionality using a diagnostic scanner.
  4. Replace any faulty components, such as the shift lever module or ECM, if they are found to be the root cause of the communication error.
  5. Clear the diagnostic trouble codes from the vehicle's system and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix U0103 Chevrolet

The typical repair costs for addressing a U0103 code on a Chevrolet vehicle can range from $200 to $500, including parts and labor. However, it is essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may charge less. It is recommended to inquire about local rates to obtain a more accurate estimate for this repair.

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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.

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