AutoCodes – GMC – P182D 2018 GMC Sierra

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

Quick Answer

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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: P182D 2018 GMC Sierra indicates Internal Mode Switch 'P' Circuit High Voltage.
Common causes: Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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 220

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P182D 2018 GMC Sierra Description

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. The internal mode switch consists of 5 separate hall effect switches. Each hall effect switch is supplied with a 9 V reference circuit and a signal circuit from the TCM. Each signal circuit for each gear selector position will have either a voltage reading of 0.70-0.96 V indicating On or 1.68-2.38 V indicating Off. The voltage values on each internal mode switch circuit will change and are dependent on the position of the gear selector. The state of each internal mode switch A/B/C/P/S signal circuit is displayed on the scan tool. The Diagnostic Trouble Code (DTC) will be set when the TCM has detected the internal mode switch P signal circuit voltage is greater than 2.38 V, for 1.75 s.

OBDII Code P182D 2018 GMC Sierra - Internal Mode Switch 'P' Circuit High Voltage - AutoCodes.com — P182D 2018 GMC Sierra Code - Internal Mode Switch 'P' Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P182D 2018 GMC Sierra?

Faulty Transmission Internal Mode Switch
Transmission Internal Mode Switch harness is open or shorted
Transmission Internal Mode Switch circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P182D 2018 GMC Sierra?

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 P182D 2018 GMC Sierra 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 P182D 2018 GMC Sierra code?

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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.