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U2146 Pontiac Code - Lost Communication With Shift Lever Module

Quick Answer

The U2146 diagnostic trouble code (DTC) for Pontiac vehicles indicates a communication failure between the vehicle's engine control module (ECM) and the shift lever module. Common causes include Faulty wiring or connectors between the ECM and shift lever module, Corrosion or damage to the communication lines, Failed shift lever module. 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 wiring or connectors between the ECM and shift lever module, Corrosion or damage to the communication lines, Failed shift lever module.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code U2146 Pontiac Description

The U2146 diagnostic trouble code (DTC) for Pontiac vehicles indicates a communication failure between the vehicle's engine control module (ECM) and the shift lever module. This means that the ECM is unable to receive or transmit data from the shift lever module, which can lead to various issues with the vehicle's shifting and transmission system. This can affect the vehicle's performance, causing erratic shifting, transmission slippage, and even the inability to shift gears properly. If left unresolved, this communication loss can result in further damage to the transmission system and potentially lead to costly repairs down the line.

OBDII Code U2146 Pontiac - Lost Communication With Shift Lever Module
U2146 Pontiac Code - Lost Communication With Shift Lever Module

Common Causes of U2146 Pontiac

  1. Faulty wiring or connectors between the ECM and shift lever module
  2. Corrosion or damage to the communication lines
  3. Failed shift lever module
  4. ECM software or hardware issues
  5. Electrical system malfunctions

Symptoms of U2146 Pontiac

  1. Erratic shifting behavior
  2. Transmission slipping or hesitation
  3. Inability to shift gears smoothly
  4. Illumination of the check engine light
  5. Loss of power or acceleration

How to Fix U2146 Pontiac

  1. Perform a thorough inspection of the wiring and connectors between the ECM and shift lever module.
  2. Check for any signs of corrosion or damage to the communication lines.
  3. Test the shift lever module for functionality and replace if necessary.
  4. Update the ECM software or replace the ECM if deemed faulty.
  5. Clear the DTC and perform a test drive to ensure proper communication and shifting operation.

Cost to Fix U2146 Pontiac

The cost of repairing a lost communication issue with the shift lever module in a Pontiac can vary depending on the extent of the damage and the specific parts that need to be replaced. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. It's recommended to consult with a professional mechanic to get an accurate estimate based on your specific vehicle and location.

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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.

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