Engine-CodesGMC – P182D 2018 GMC Sierra

P182D 2018 GMC Sierra Code - Internal Mode Switch 'P' Circuit High Voltage

Quick Answer

The P182D diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the internal mode switch 'P' circuit having high voltage. Common causes include Faulty internal mode switch, Wiring issues in the 'P' circuit, Malfunctioning transmission control 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
P182D 2018 GMC Sierra indicates Internal Mode Switch 'P' Circuit High Voltage.
Common causes
Common causes include Faulty internal mode switch, Wiring issues in the 'P' circuit, Malfunctioning transmission control 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.
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P182D 2018 GMC Sierra Description

The P182D diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the internal mode switch 'P' circuit having high voltage. The internal mode switch is a component of the transmission system that helps control the shift patterns and modes of the transmission. When this circuit has high voltage, it can lead to issues with the transmission's performance and overall drivability of the vehicle.

OBDII Code P182D 2018 GMC Sierra - Internal Mode Switch 'P' Circuit High Voltage
P182D 2018 GMC Sierra Code - Internal Mode Switch 'P' Circuit High Voltage

Common Causes of P182D 2018 GMC Sierra

  1. Faulty internal mode switch
  2. Wiring issues in the 'P' circuit
  3. Malfunctioning transmission control module
  4. Power supply problems to the internal mode switch
  5. Corrosion or damage to connections in the circuit

Symptoms of P182D 2018 GMC Sierra

  1. Erratic shifting behavior
  2. Transmission slipping
  3. Stuck in a particular gear
  4. Limp mode activation
  5. Check engine light illuminated

How to Fix P182D 2018 GMC Sierra

  1. Diagnose the code using a scan tool to pinpoint the exact cause of the high voltage in the 'P' circuit.
  2. Inspect the internal mode switch and wiring for any visible damage or corrosion.
  3. Test the internal mode switch and related components for proper functionality.
  4. Repair or replace any faulty components, such as the internal mode switch, wiring, or transmission control module.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P182D 2018 GMC Sierra

The typical repair costs for addressing the internal mode switch 'P' circuit high voltage code can range from $200 to $500, including parts and labor. However, the final cost may vary depending on the specific diagnosis time, labor rates, and the extent of the repairs needed. It is advisable to consult with a trusted auto repair shop to get an accurate estimate for your particular vehicle.

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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 P182D 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P182D in a 2018 GMC Sierra?

- Common symptoms include issues with shifting gears, hesitation or rough shifting, and possibly an illuminated Check Engine Light.

2. What can cause the Internal Mode Switch 'P' Circuit High Voltage code (P182D) in a 2018 GMC Sierra?

- The code P182D can be triggered by a faulty internal mode switch, damaged wiring or connectors, or issues with the transmission control module.

3. How can I diagnose the Internal Mode Switch 'P' Circuit High Voltage code in my 2018 GMC Sierra?

- Diagnosis involves using a scan tool to read the OBDII code, checking the internal mode switch for proper operation, and inspecting the wiring and connectors for any damage.

4. Can I continue to drive my 2018 GMC Sierra with the P182D code?

- It is not recommended to continue driving with the P182D code present, as it may cause further damage to the transmission or affect the vehicle's performance.

5. What are some repair tips for fixing the P182D code in a 2018 GMC Sierra?

- Repair tips include checking and replacing the internal mode switch if necessary, repairing any damaged wiring or connectors, and resetting the code after repairs are made.

6. How much does it typically cost to repair the Internal Mode Switch 'P' Circuit High Voltage code in a 2018 GMC Sierra?

- The cost of repair can vary depending on the extent of the issue, but it may range from $200 to $500 for parts and labor.

7. Can a DIY enthusiast fix the P182D code in a 2018 GMC Sierra?

- While some experienced DIY enthusiasts may be able to diagnose and repair the P182D code, it is recommended to seek professional help due to the complexity of transmission-related issues.

8. Is the Internal Mode Switch 'P' Circuit High Voltage code a common problem in 2018 GMC Sierra vehicles?

- While it may not be as common as some other OBDII codes, the P182D code can still occur in 2018 GMC Sierra vehicles due to various factors such as wear and tear or electrical issues.

9. Will resetting the Check Engine Light resolve the P182D code in a 2018 GMC Sierra?

- Simply resetting the Check Engine Light may temporarily clear the code, but it is important to address the underlying issue causing the P182D code to prevent it from reoccurring.

10. How long does it take to repair the OBDII code P182D in a 2018 GMC Sierra?

- The repair time can vary depending on the exact cause of the code and the availability of parts, but it may take a few hours to a full day to diagnose and fix the P182D code in a 2018 GMC Sierra.

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