AutoCodes – Buick – U2142 Buick

U2142 Buick 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 Buick 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 1,223

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

What does this mean?

What are the Possible Causes of the DTC U2142 Buick?

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 Buick?

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 Buick 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 Buick Code

1. What are the common symptoms of OBDII code U2142 in a Buick?

- Common symptoms include issues with the vehicle's transmission, engine performance, or electrical systems. The check engine light may also illuminate.

2. What does the OBDII code U2142 Buick, "Lost Communication With UART System," indicate?

- This code indicates a communication problem between the vehicle's onboard computer and the UART system, which is responsible for transferring data between components.

3. What are some possible causes of the U2142 code in a Buick?

- Possible causes include a faulty UART module, wiring or connection issues, a defective control module, or software malfunctions within the vehicle's systems.

4. How can I diagnose the U2142 code in my Buick?

- Diagnosing the U2142 code typically involves using a diagnostic scanner to retrieve the specific details of the code and performing a thorough inspection of the UART system components and related wiring.

5. What are the repair options for resolving the U2142 code in a Buick?

- Repair options may include repairing or replacing damaged wiring, repairing or replacing the UART module, addressing any software issues, or reprogramming the control module.

6. Can driving with the U2142 code present cause further damage to my Buick?

- Continuing to drive with the U2142 code present can potentially lead to issues with the vehicle's performance, transmission, or other systems. It is recommended to address the issue promptly.

7. Is it safe to reset the U2142 code in my Buick using a diagnostic scanner?

- While resetting the code may temporarily turn off the check engine light, it will not fix the underlying issue causing the U2142 code. It is important to diagnose and repair the problem to prevent future issues.

8. How much does it typically cost to repair the U2142 code in a Buick?

- The cost of repairing the U2142 code can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor costs. It is recommended to consult with a professional mechanic for an accurate estimate.

9. Can I attempt to repair the U2142 code in my Buick myself?

- Repairing the U2142 code may require advanced diagnostic tools and knowledge of automotive systems. It is recommended to seek the assistance of a qualified mechanic to properly diagnose and repair the issue.

10. Will the U2142 code cause my Buick to fail an emissions test?

- Yes, the U2142 code can result in a failed emissions test due to the communication error affecting the vehicle's onboard systems. It is important to address and repair the issue before undergoing emissions testing.