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P182F 2018 GMC Sierra Code - Internal Mode Switch 'C' Circuit High Voltage

Quick Answer

The P182F diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a high voltage condition detected in the Internal Mode Switch 'C' circuit. Common causes include Faulty Internal Mode Switch, Wiring or connector issues in the IMS circuit, Corrosion or damage to the IMS circuit. 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
P182F 2018 GMC Sierra indicates Internal Mode Switch 'C' Circuit High Voltage.
Common causes
Common causes include Faulty Internal Mode Switch, Wiring or connector issues in the IMS circuit, Corrosion or damage to the IMS circuit.
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 Sep 16, 2024
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Code P182F 2018 GMC Sierra Description

The P182F diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a high voltage condition detected in the Internal Mode Switch 'C' circuit. The Internal Mode Switch (IMS) is a component of the transmission control system that helps the vehicle's computer determine the current gear selection. When the IMS 'C' circuit reports a high voltage, it means that there is an electrical issue affecting the proper operation of the IMS.

OBDII Code P182F 2018 GMC Sierra - Internal Mode Switch 'C' Circuit High Voltage
P182F 2018 GMC Sierra Code - Internal Mode Switch 'C' Circuit High Voltage

Common Causes of P182F 2018 GMC Sierra

  1. Faulty Internal Mode Switch
  2. Wiring or connector issues in the IMS circuit
  3. Corrosion or damage to the IMS circuit
  4. Faulty transmission control module (TCM)
  5. Electrical interference or short circuits in the IMS circuit

Symptoms of P182F 2018 GMC Sierra

  1. Harsh shifting between gears
  2. Delayed engagement when shifting
  3. Incorrect gear selection displayed on the dashboard
  4. Limp mode activation
  5. Transmission slipping or erratic behavior

How to Fix P182F 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the IMS circuit, including wiring and connectors, to check for any visible damage or corrosion.
  2. Test the Internal Mode Switch using a multimeter to determine if it is functioning correctly.
  3. Check the transmission control module (TCM) for any fault codes and perform a diagnostic scan to identify any related issues.
  4. Replace the Internal Mode Switch if it is found to be faulty, ensuring proper installation and calibration.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved and that the transmission is operating correctly.

Cost to Fix P182F 2018 GMC Sierra

The cost of repairing the Internal Mode Switch 'C' Circuit High Voltage issue can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $150 to $300. Overall, the total repair cost for this issue is typically between $250 and $600. However, it is important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at auto repair shops. It is recommended to obtain quotes from local auto repair shops to get a more accurate estimate for this repair.

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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 P182F 2018 GMC Sierra Code

1. What does OBDII code P182F for a 2018 GMC Sierra mean?

The code P182F indicates a problem with the Internal Mode Switch 'C' Circuit High Voltage in the vehicle's transmission system.

2. What are the common symptoms of OBDII code P182F in a 2018 GMC Sierra?

Common symptoms of this code may include issues with shifting gears, the transmission not engaging properly, or the vehicle going into limp mode.

3. What are the possible causes of OBDII code P182F in a 2018 GMC Sierra?

Potential causes of this code include a faulty internal mode switch, damaged wiring or connectors related to the switch, or issues with the transmission control module.

4. How can I diagnose OBDII code P182F in my 2018 GMC Sierra?

Diagnosing this code typically involves checking the internal mode switch for proper operation, inspecting the wiring and connectors for any damage, and using a scan tool to gather data from the transmission control module.

5. Can I still drive my 2018 GMC Sierra with OBDII code P182F?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the transmission and potentially cause unsafe driving conditions.

6. How serious is OBDII code P182F in a 2018 GMC Sierra?

This code should be addressed promptly, as it can affect the performance and reliability of the transmission in the vehicle.

7. How can I repair OBDII code P182F in my 2018 GMC Sierra?

Repairing this code may involve replacing the internal mode switch, repairing any damaged wiring or connectors, or reprogramming the transmission control module.

8. Is it possible to reset OBDII code P182F in a 2018 GMC Sierra without repairs?

While you can clear the code with a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. How much does it cost to fix OBDII code P182F in a 2018 GMC Sierra?

The cost of fixing this code can vary depending on the exact cause of the issue, but it may involve parts and labor expenses for repairs.

10. Can OBDII code P182F in a 2018 GMC Sierra cause other problems if left unaddressed?

If left unaddressed, this code can potentially lead to further damage to the transmission system and result in more severe and costly repairs down the line.

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