AutoCodes – GMC – P182F GMC

P182F GMC Code - Internal Mode Switch 'C' 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: P182F GMC indicates Internal Mode Switch 'C' 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 1,383

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 P182F 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 C signal circuit voltage is greater than 2.38 V, for 1.75 s.

OBDII Code P182F GMC - Internal Mode Switch 'C' Circuit High Voltage - AutoCodes.com — P182F GMC Code - Internal Mode Switch 'C' Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P182F 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 P182F 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 P182F 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 P182F GMC code?

Need more information on how to fix the P182F GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P182F 2014 GMC Sierra — Internal Mode Switch 'C' Circuit High Voltage
P182F 2015 GMC Sierra — Internal Mode Switch 'C' Circuit High Voltage
P182F 2016 GMC Sierra — Internal Mode Switch 'C' Circuit High Voltage
P182F 2017 GMC Sierra — Internal Mode Switch 'C' Circuit High Voltage
P182F 2018 GMC Sierra — Internal Mode Switch 'C' 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 P182F GMC Code

1. What are common symptoms of OBDII code P182F GMC (Internal Mode Switch 'C' Circuit High Voltage)?

Common symptoms include issues with shifting gears, hesitation when accelerating, and the inability to shift out of a certain gear.

2. What causes OBDII code P182F GMC to trigger?

This code is typically triggered by a fault in the internal mode switch 'C' circuit, which can be caused by damaged wiring, a faulty switch, or a poor connection.

3. How can I diagnose OBDII code P182F GMC?

Diagnosis involves using a scan tool to read the code, checking the internal mode switch 'C' circuit for continuity and proper voltage, and inspecting the wiring and connections for any damage.

4. Can I continue driving with OBDII code P182F GMC?

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

5. How can I repair OBDII code P182F GMC?

Repair options include repairing or replacing damaged wiring, replacing the internal mode switch, ensuring proper connections, and clearing the code with a scan tool.

6. Is OBDII code P182F GMC a serious issue?

While it may not cause immediate harm to the vehicle, ignoring this code can lead to transmission problems and should be addressed promptly.

7. Can a DIY enthusiast fix OBDII code P182F GMC?

Depending on the extent of the issue and the individual's mechanical skills, some DIY enthusiasts may be able to address this code themselves by following repair guides and using the necessary tools.

8. How much does it cost to repair OBDII code P182F GMC at a mechanic?

The cost of repair can vary depending on the labor rates and parts needed, but it is advisable to get a few quotes from different mechanics to compare prices.

9. Will resetting the OBDII code P182F GMC make it go away permanently?

Simply resetting the code without addressing the underlying issue will not make it go away permanently. It is essential to diagnose and repair the root cause of the problem.

10. How long does it take to repair OBDII code P182F GMC?

The repair time can vary depending on the extent of the issue, availability of parts, and the mechanic's experience. It is best to consult with a professional for a more accurate estimate.