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U2142 Cadillac 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 Cadillac 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 1,162

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

What does this mean?

What are the Possible Causes of the DTC U2142 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code U2142 in a Cadillac related to Lost Communication With UART System?

- Common symptoms include the check engine light illuminating, issues with the transmission, and possible difficulty starting the vehicle.

2. What are some potential causes of the U2142 code in a Cadillac?

- Causes could include a faulty UART module, damaged wiring or connectors in the communication network, or a malfunctioning control module.

3. How can I diagnose the U2142 code in my Cadillac?

- Diagnosing the U2142 code involves using a diagnostic scanner to retrieve the trouble codes, inspecting the wiring and connectors for damage, and testing the UART module and related components.

4. What steps can I take to repair the U2142 code in my Cadillac?

- Repair steps may include repairing or replacing damaged wiring, connectors, or modules, resetting the system, and clearing the trouble codes with a diagnostic scanner.

5. Can I drive my Cadillac with the U2142 code present?

- It is not recommended to drive your Cadillac with the U2142 code present, as it can lead to further damage and potential safety issues. It is best to address the issue promptly.

6. How much does it typically cost to repair the U2142 code in a Cadillac?

- The cost of repairing the U2142 code can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any preventative measures I can take to avoid the U2142 code in my Cadillac?

- To prevent the U2142 code, it is essential to perform regular maintenance on your vehicle, including checking the communication network components and addressing any issues promptly.

8. Can a DIY enthusiast repair the U2142 code in a Cadillac?

- While some may attempt to repair the U2142 code themselves, it is recommended to seek professional help, especially if you are not experienced in diagnosing and repairing automotive electrical systems.

9. How long does it take to repair the U2142 code in a Cadillac?

- The repair time for the U2142 code can vary depending on the specific issue and the expertise of the technician, but it may take a few hours to a full day to diagnose and repair the problem.

10. Will the U2142 code reset on its own after repairs are made?

- After repairs are made to address the U2142 code, the trouble codes can be cleared using a diagnostic scanner to reset the system and turn off the check engine light.