AutoCodes – GMC – P182D GMC

P182D GMC 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 GMC 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 1,196

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

What does this mean?

What are the Possible Causes of the DTC P182D GMC?

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 GMC?

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 GMC 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 GMC code?

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Information for Specific GMC Models

P182D 2014 GMC Sierra — Internal Mode Switch 'P' Circuit High Voltage
P182D 2015 GMC Sierra — Internal Mode Switch 'P' Circuit High Voltage
P182D 2016 GMC Sierra — Internal Mode Switch 'P' Circuit High Voltage
P182D 2017 GMC Sierra — Internal Mode Switch 'P' Circuit High Voltage
P182D 2018 GMC Sierra — Internal Mode Switch 'P' Circuit High Voltage

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 GMC Code

1. What are the common symptoms of OBDII code P182D GMC (Internal Mode Switch 'P' Circuit High Voltage)?

Common symptoms include erratic shifting, difficulty engaging gears, and the transmission may go into limp mode.

2. What can cause OBDII code P182D GMC?

This code is typically caused by a faulty internal mode switch, damaged wiring or connectors, or issues with the transmission control module.

3. How do I diagnose OBDII code P182D GMC?

Diagnosis involves using a scan tool to read the code, checking the internal mode switch for proper operation, inspecting wiring and connectors for damage, and testing the transmission control module.

4. Can I drive my vehicle with OBDII code P182D GMC?

It is not recommended to drive your vehicle with this code present, as it can lead to further damage to the transmission and affect driving performance.

5. How serious is OBDII code P182D GMC?

This code should be addressed promptly as it can cause drivability issues and potentially lead to more severe transmission problems if left unresolved.

6. How much does it cost to repair OBDII code P182D GMC?

The cost of repair can vary depending on the underlying issue, but it may involve replacing the internal mode switch, repairing wiring/connectors, or reprogramming the transmission control module. Costs can range from a few hundred to over a thousand dollars.

7. Can I repair OBDII code P182D GMC myself?

DIY repair is possible if you have the necessary knowledge, tools, and experience. However, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair.

8. What are some tips for preventing OBDII code P182D GMC?

Regularly maintaining your vehicle, checking for any transmission-related issues, and addressing them promptly can help prevent this code from occurring.

9. How long does it take to repair OBDII code P182D GMC?

The repair time can vary depending on the exact cause of the code and the extent of the repair needed. It can take anywhere from a few hours to a full day to complete the repair.

10. Can OBDII code P182D GMC be intermittent?

Yes, this code can sometimes be intermittent, especially if the issue is related to loose wiring or a faulty internal mode switch. It is important to address intermittent issues promptly to prevent further complications.