AutoCodes – Pontiac – U2142 Pontiac

U2142 Pontiac 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 Pontiac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 699

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC U2142 Pontiac?

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 Pontiac?

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 Pontiac 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.

Need more information about the U2142 Pontiac code?

Need more information on how to fix the U2142 Pontiac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2142 Pontiac code diagnosed by a professional: Find a repair shop in your area

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 Pontiac Code

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

- Common symptoms include issues with the vehicle's transmission, erratic shifting, and difficulties with the speedometer or odometer.

2. What are the possible causes of OBDII code U2142 in a Pontiac?

- The code U2142 can be triggered by a faulty transmission control module (TCM), damaged wiring or connectors, or a malfunctioning UART system.

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

- Diagnosing the code U2142 involves using a professional OBDII scanner to read the code, checking the TCM for any faults, inspecting the wiring and connectors for damage, and testing the UART system.

4. Can a DIY enthusiast repair the OBDII code U2142 in a Pontiac?

- While some basic troubleshooting like checking for loose connections can be done by a DIY enthusiast, repairing the code U2142 may require advanced diagnostic tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

5. Is it safe to continue driving my Pontiac with the OBDII code U2142 present?

- It is not recommended to continue driving your Pontiac with the code U2142 present, as it can lead to further transmission issues and potential safety hazards. It is advisable to address the problem promptly.

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

- The cost of repairing the OBDII code U2142 in a Pontiac can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It is advisable to get a few quotes from different mechanics to compare prices.

7. Can a weak battery cause the OBDII code U2142 to appear in a Pontiac?

- Yes, a weak or failing battery can sometimes cause communication errors between various systems in the vehicle, leading to the appearance of the OBDII code U2142. It is recommended to ensure the battery is in good condition before further diagnosis.

8. How long does it typically take to repair the OBDII code U2142 in a Pontiac?

- The repair time for the OBDII code U2142 in a Pontiac can vary depending on the complexity of the issue and the availability of parts. It may take a few hours to a day for a mechanic to diagnose and fix the problem.

9. Can weather conditions affect the appearance of the OBDII code U2142 in a Pontiac?

- Extreme weather conditions, such as excessive heat or moisture, can sometimes lead to electrical issues and trigger the OBDII code U2142 related to Lost Communication With UART System in a Pontiac. It is important to keep the vehicle protected from such conditions.

10. Will resetting the OBDII code U2142 in a Pontiac make it go away permanently?

- Simply resetting the code U2142 may make it disappear temporarily, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is crucial to diagnose and repair the root cause of the problem for a permanent solution.