AutoCodes – GMC – P182D 2014 GMC Sierra

P182D 2014 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 2014 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 202

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 2014 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 2014 GMC Sierra - Internal Mode Switch 'P' Circuit High Voltage - AutoCodes.com — P182D 2014 GMC Sierra Code - Internal Mode Switch 'P' Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P182D 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code

1. What does the OBDII code P182D mean on a 2014 GMC Sierra?

P182D indicates a high voltage issue in the Internal Mode Switch 'P' circuit, which is part of the transmission range sensor system.

2. What are the common symptoms of P182D in a 2014 GMC Sierra?

Symptoms may include a check engine light, trouble shifting gears, the vehicle stuck in Park or another gear, and erratic transmission behavior.

3. What causes the P182D code to appear?

Common causes include a faulty internal mode switch, damaged or corroded wiring, a poor electrical connection, or issues with the transmission control module (TCM).

4. Can I drive my 2014 GMC Sierra with the P182D code?

While it may be possible to drive, itâ€™s not recommended as the transmission may not function properly, potentially leading to unsafe driving conditions or further damage.

5. How can I fix the P182D code on my 2014 GMC Sierra?

Repairs may involve inspecting and repairing wiring or connectors, replacing the internal mode switch, or reprogramming/updating the TCM if necessary.

6. How do I diagnose the cause of P182D in my 2014 GMC Sierra?

Start by using a scan tool to confirm the code, then visually inspect the wiring and connectors around the transmission for damage or corrosion. Test the internal mode switch and related circuits for proper voltage and resistance.

7. Is the internal mode switch the same as a neutral safety switch?

Yes, the internal mode switch serves a similar function to a neutral safety switch by detecting the gear position and communicating it to the TCM.

8. What tools are needed to troubleshoot the P182D code?

Youâ€™ll need an OBDII scan tool, a multimeter for electrical testing, and possibly a wiring diagram for your GMC Sierraâ€™s transmission system.

9. How much does it cost to repair the P182D code?

Repair costs can vary, but replacing the internal mode switch typically ranges from $200 to $500, including parts and labor. Wiring repairs may cost less if no major components are damaged.

10. Can a weak battery cause the P182D code in a 2014 GMC Sierra?

A weak or failing battery is unlikely to directly cause P182D but can lead to voltage irregularities that might contribute to electrical issues. Always ensure the battery is in good condition as part of the diagnostic process.