AutoCodes – Saturn – U2146 Saturn

U2146 Saturn 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 Saturn 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 716

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

What does this mean?

What are the Possible Causes of the DTC U2146 Saturn?

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 Saturn?

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 Saturn 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 U2146 Saturn code?

Need more information on how to fix the U2146 Saturn 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 Saturn Code

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

- Common symptoms include difficulty shifting gears, incorrect gear display on the dashboard, and potential illumination of the check engine light.

2. What are the possible causes of the U2146 code in a Saturn?

- The U2146 code may be triggered by a faulty shift lever module, damaged wiring or connectors, a blown fuse, or a malfunction in the vehicle's control module.

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

- Diagnosing the U2146 code typically involves using an OBDII scanner to retrieve the specific fault codes, inspecting the wiring and connectors for any damage, and testing the shift lever module for proper functionality.

4. What are some repair tips for resolving the U2146 code in a Saturn?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the shift lever module if necessary, ensuring all fuses related to the transmission system are intact, and performing a relearn procedure if required.

5. Can I drive my Saturn with the U2146 code present?

- It is not recommended to drive your Saturn with the U2146 code present, as it can affect the vehicle's shifting performance and potentially lead to further transmission issues if left unresolved.

6. How much does it typically cost to repair the U2146 code in a Saturn?

- The cost of repairing the U2146 code in a Saturn 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. Will disconnecting the battery reset the U2146 code in a Saturn?

- Disconnecting the battery may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven and the system performs its self-checks.

8. Is the U2146 code specific to Saturn vehicles only?

- The U2146 code related to lost communication with the shift lever module is not exclusive to Saturn vehicles and can also be found in other makes and models equipped with OBDII systems.

9. How urgent is it to address the U2146 code in a Saturn?

- It is recommended to address the U2146 code promptly to prevent potential transmission issues and ensure the safe and proper operation of the vehicle.

10. Can I fix the U2146 code in my Saturn myself, or do I need to take it to a professional mechanic?

- While some DIY enthusiasts may be able to address the U2146 code by checking connections and fuses, it is generally advisable to consult a professional mechanic for a proper diagnosis and repair to ensure the issue is resolved correctly.