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Engine-Codes – GMC – U2142 GMC

U2142 GMC Code - Lost Communication With UART System

Quick Answer

The U2142 GMC code indicates that there is a communication error with the UART (Universal Asynchronous Receiver-Transmitter) system in the vehicle. Common causes include Faulty Wiring: Damaged or corroded wiring in the UART system can disrupt communication signals, Defective Control Module: A malfunctioning control module can prevent proper communication between systems, Software Glitch: An issue with the vehicle's software or programming can cause communication errors. 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
U2142 GMC indicates Lost Communication With UART System.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring in the UART system can disrupt communication signals, Defective Control Module: A malfunctioning control module can prevent proper communication between systems, Software Glitch: An issue with the vehicle's software or programming can cause communication errors.
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 U2142 GMC Description

The U2142 GMC code indicates that there is a communication error with the UART (Universal Asynchronous Receiver-Transmitter) system in the vehicle. The UART system is responsible for serial communication between different electronic control modules in the vehicle. When this communication is lost, it can lead to various issues with the vehicle's performance and functionality.

OBDII Code U2142 GMC - Lost Communication With UART System
U2142 GMC Code - Lost Communication With UART System

Common Causes of U2142 GMC

  1. Faulty Wiring: Damaged or corroded wiring in the UART system can disrupt communication signals.
  2. Defective Control Module: A malfunctioning control module can prevent proper communication between systems.
  3. Software Glitch: An issue with the vehicle's software or programming can cause communication errors.
  4. Weak Battery: A weak or failing battery can lead to voltage fluctuations that affect the UART system.
  5. Water Damage: Exposure to water or moisture can cause corrosion in connectors, leading to communication issues.

Symptoms of U2142 GMC

  1. Check Engine Light: The most common symptom associated with the U2142 code is the illumination of the check engine light on the dashboard.
  2. Rough Running Engine: The engine may run rough or misfire due to the lack of communication between systems.
  3. Transmission Issues: The vehicle may experience shifting problems or hesitation when changing gears.
  4. Electrical Malfunctions: Other electrical components such as power windows, door locks, or lights may not function properly.
  5. Inability to Start: In severe cases, the vehicle may not start at all due to the communication error.

How to Fix U2142 GMC

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the U2142 code and perform a thorough inspection of the UART system.
  2. Check Wiring and Connectors: Inspect the wiring and connectors in the UART system for any damage or corrosion, repairing or replacing as needed.
  3. Test Control Modules: Check the control modules involved in the communication error for proper functionality and replace any faulty modules.
  4. Clear Codes and Test Drive: Clear the U2142 code from the vehicle's computer, then test drive the vehicle to ensure the issue has been resolved.
  5. Perform Software Updates: If a software glitch is suspected, update the vehicle's software to the latest version to address any communication errors.

Cost to Fix U2142 GMC

The typical repair costs for addressing the U2142 code can range from $100 to $500, depending on the specific cause of the communication error and the parts needed for repair. This estimate includes the cost of diagnostic time, parts, and labor. However, it's essential to note that actual repair costs can vary based on factors such as the location of the repair shop, the vehicle's make and model, and the type of engine. Diagnostic time and labor rates at auto repair shops typically range from $80 to $150 per hour, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. To obtain a more accurate estimate, it's recommended to inquire with local repair shops.

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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 U2142 GMC Code

1. What are the common symptoms of OBDII code U2142 GMC?

The common symptoms of U2142 GMC include issues with the vehicle's transmission, engine misfires, dashboard warning lights illuminated, and difficulty shifting gears.

2. What are the possible causes of U2142 GMC code?

The U2142 code is typically caused by a communication failure between modules in the vehicle's network, such as a faulty wiring connection, damaged control module, or a defective UART system.

3. How can I diagnose the U2142 GMC code?

Diagnosing the U2142 code involves using a professional OBDII scanner to pinpoint the exact location and nature of the communication failure within the vehicle's network.

4. Can I drive my vehicle with the U2142 GMC code?

It is not recommended to drive the vehicle with the U2142 code present, as it can affect the vehicle's performance and potentially lead to further damage if left unresolved.

5. What are some repair tips for fixing the U2142 GMC code?

Repair tips for U2142 GMC may include checking and repairing any damaged wiring connections, replacing the faulty control module, or resetting the communication network using a diagnostic tool.

6. How much does it cost to repair the U2142 GMC code?

The cost of repairing the U2142 code can vary depending on the specific cause of the communication failure, the extent of the damage, and whether professional assistance is required.

7. Is the U2142 GMC code a common issue in GMC vehicles?

While the U2142 code may not be as common as other OBDII codes, it can still occur in GMC vehicles due to communication issues within the vehicle's network.

8. Can a DIY enthusiast fix the U2142 GMC code?

Depending on the DIY enthusiast's skill level and access to tools, it may be possible to diagnose and repair the U2142 code. However, professional assistance is recommended for more complex issues.

9. How long does it take to repair the U2142 GMC code?

The repair time for the U2142 code can vary based on the cause of the communication failure and the repair process involved. It may take anywhere from a few hours to a full day.

10. Will resetting the U2142 GMC code make it go away permanently?

Simply resetting the U2142 code may temporarily clear the error, but if the underlying communication issue is not resolved, the code is likely to reappear. It's important to diagnose and fix the root cause of the problem for a permanent solution.

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