AutoCodes – GMC – U2142 GMC

U2142 GMC Code - Lost Communication With UART System

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Universal Asynchronous Receiver Transmitter (UART), Universal Asynchronous Receiver Transmitter harness is open or shorted, Universal Asynchronous Receiver Transmitter 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: U2142 GMC indicates Lost Communication With UART System.
Common causes: Common causes include Faulty Universal Asynchronous Receiver Transmitter (UART), Universal Asynchronous Receiver Transmitter harness is open or shorted, Universal Asynchronous Receiver Transmitter 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 3,587

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 Jun 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2142 GMC Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices 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 device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. A loss of serial data communications Diagnostic Trouble Code (DTC) does not represent a failure of the devices that contain the stored code. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U2142 GMC - Lost Communication With UART System - AutoCodes.com — U2142 GMC Code - Lost Communication With UART System

What does this mean?

What are the Possible Causes of the DTC U2142 GMC?

Faulty Universal Asynchronous Receiver Transmitter (UART)
Universal Asynchronous Receiver Transmitter harness is open or shorted
Universal Asynchronous Receiver Transmitter circuit poor electrical connection

How to Fix the DTC U2142 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 U2142 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.

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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.