AutoCodes – Chevrolet – U2146 Chevrolet

U2146 Chevrolet Code - Lost Communication With Shift Lever Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Shift Lever Module (SLM), Shift Lever Module harness is open or shorted, Shift Lever Module 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: U2146 Chevrolet indicates Lost Communication With Shift Lever Module.
Common causes: Common causes include Faulty Shift Lever Module (SLM), Shift Lever Module harness is open or shorted, Shift Lever Module 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 684

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 U2146 Chevrolet 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 U2146 Chevrolet - Lost Communication With Shift Lever Module - AutoCodes.com — U2146 Chevrolet Code - Lost Communication With Shift Lever Module

What does this mean?

What are the Possible Causes of the DTC U2146 Chevrolet?

Faulty Shift Lever Module (SLM)
Shift Lever Module harness is open or shorted
Shift Lever Module circuit poor electrical connection

How to Fix the DTC U2146 Chevrolet?

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 U2146 Chevrolet 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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Need more information on how to fix the U2146 Chevrolet code? Get Access to Factory Service Manuals

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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 U2146 Chevrolet Code

1. What are common symptoms of OBDII code U2146 in a Chevrolet related to lost communication with the shift lever module?

- Common symptoms include issues with shifting gears, illuminated warning lights on the dashboard, and the vehicle going into limp mode.

2. What are some possible causes of the U2146 OBDII code in a Chevrolet?

- Possible causes include a faulty shift lever module, damaged wiring or connectors, a blown fuse, or a software communication error.

3. How can I diagnose the U2146 code in my Chevrolet?

- Diagnosing the U2146 code usually involves using a diagnostic scanner to retrieve the specific details of the code, checking the shift lever module for proper functioning, and inspecting the wiring and connectors for any damage.

4. Can I still drive my Chevrolet if it has the U2146 code stored?

- It is not recommended to drive your Chevrolet with the U2146 code present, as it can lead to potential safety hazards due to issues with the shift lever module communication.

5. How can I repair the U2146 code in my Chevrolet?

- Repairing the U2146 code typically involves addressing the root cause of the communication loss, such as replacing a faulty shift lever module, repairing damaged wiring or connectors, or resetting the communication system.

6. Is it possible to clear the U2146 code in my Chevrolet without fixing the issue?

- Clearing the code without fixing the underlying issue is not recommended, as the problem will likely resurface, and potential safety risks may persist.

7. Can a DIY enthusiast fix the U2146 code issue in a Chevrolet?

- Depending on the skill level and experience of the individual, some DIY enthusiasts may be able to address the U2146 code by following diagnostic procedures and repair guides specific to their Chevrolet model.

8. How much does it cost to repair the U2146 code in a Chevrolet at a dealership or repair shop?

- The cost of repairing the U2146 code can vary depending on the specific issue, labor rates, and parts needed. It is recommended to obtain estimates from different sources before proceeding with repairs.

9. Are there any preventive measures to avoid the U2146 code in a Chevrolet?

- Regular maintenance, such as checking the wiring and connectors for wear, keeping the shift lever module clean, and addressing any warning lights promptly, can help prevent issues leading to the U2146 code.

10. Can the U2146 code in a Chevrolet be related to other system failures?

- The U2146 code is specifically related to lost communication with the shift lever module, but it may be interconnected with other systems in the vehicle, so a thorough diagnosis is recommended.