AutoCodes – Pontiac – U2146 Pontiac

U2146 Pontiac 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 Pontiac 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 494

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

What does this mean?

What are the Possible Causes of the DTC U2146 Pontiac?

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 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 U2146 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.

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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 Pontiac Code

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

- Common symptoms include difficulty shifting gears, the gear indicator not displaying correctly, and potential stalling or inability to start the vehicle.

2. What are some possible causes of OBDII code U2146 in a Pontiac indicating lost communication with the shift lever module?

- Possible causes may include a faulty shift lever module, damaged wiring or connectors, a blown fuse, or a malfunctioning PCM (powertrain control module).

3. How can I diagnose the issue causing OBDII code U2146 in my Pontiac related to lost communication with the shift lever module?

- Diagnose the issue by checking for any visible damage to wiring and connectors, testing the shift lever module for functionality, and using a diagnostic scanner to communicate with the PCM.

4. Can I still drive my Pontiac with OBDII code U2146 indicating lost communication with the shift lever module?

- It is not recommended to drive the vehicle with this issue as it may lead to safety concerns and potential further damage to the transmission system.

5. What are some repair tips for addressing OBDII code U2146 in a Pontiac due to lost communication with the shift lever module?

- Repair tips include checking and repairing damaged wiring or connectors, replacing the shift lever module if necessary, ensuring proper power supply and ground connections, and clearing the code after repairs.

6. Is it possible to reset OBDII code U2146 in a Pontiac related to lost communication with the shift lever module without fixing the underlying issue?

- While you can clear the code using a diagnostic scanner, it is important to address the root cause of the problem to prevent the code from reappearing and to ensure proper vehicle operation.

7. How much can I expect to pay for repairing OBDII code U2146 in a Pontiac associated with lost communication with the shift lever module?

- Repair costs can vary depending on the specific issue, but it is recommended to budget for diagnostic fees, replacement parts if needed, and labor costs which can range from a few hundred to over a thousand dollars.

8. Can a DIY enthusiast with basic automotive knowledge fix OBDII code U2146 in a Pontiac caused by lost communication with the shift lever module?

- Depending on the exact cause, some DIY enthusiasts may be able to address the issue by checking and repairing wiring or connectors, but more complex repairs such as replacing the shift lever module may require professional assistance.

9. How long does it typically take to repair OBDII code U2146 in a Pontiac due to lost communication with the shift lever module?

- The repair time can vary depending on the exact cause of the issue and the extent of the repairs needed, but it can range from a couple of hours to a full day or more, especially if diagnostics and part replacement are involved.