AutoCodes – GMC – P182F 2014 GMC Sierra

P182F 2014 GMC Sierra 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 2014 GMC Sierra 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 175

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

OBDII Code P182F 2014 GMC Sierra - Internal Mode Switch 'C' Circuit High Voltage - AutoCodes.com — P182F 2014 GMC Sierra Code - Internal Mode Switch 'C' Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P182F 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 P182F 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 P182F 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 P182F 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 P182F 2014 GMC Sierra Code

1. What does the OBDII code P182F mean on a 2014 GMC Sierra?

P182F indicates an issue with the Internal Mode Switch (IMS) 'C' Circuit, specifically that it is detecting a high voltage condition.

2. What are the common symptoms of code P182F on a 2014 GMC Sierra?

Symptoms may include erratic shifting, the transmission stuck in one gear, illuminated check engine light, or reduced overall vehicle performance.

3. What causes the P182F code to appear on a GMC Sierra?

Common causes include damaged wiring or connectors in the IMS circuit, a faulty Internal Mode Switch, or issues with the transmission control module (TCM).

4. Can I still drive my 2014 GMC Sierra with code P182F?

While the vehicle may be drivable, continued operation can lead to further transmission damage or unsafe driving conditions. Itâ€™s best to address the issue promptly.

5. How do I diagnose the P182F code on a GMC Sierra?

Start by inspecting the wiring and connectors for damage, check for corrosion on the IMS circuit, and test the Internal Mode Switch for proper function using a multimeter or diagnostic tool.

6. What is the Internal Mode Switch (IMS) in a GMC Sierra?

The IMS monitors the gear selection and sends corresponding signals to the transmission control module (TCM) to facilitate proper shifting.

7. How can I fix the P182F code on my 2014 GMC Sierra?

Repairs may involve replacing damaged wiring, cleaning corroded connectors, replacing the Internal Mode Switch, or reprogramming the TCM if necessary.

8. How much does it cost to repair the P182F code on a GMC Sierra?

Repair costs can vary but typically range from $150 to $400, depending on whether the issue is with wiring, the IMS, or the TCM.

9. Can a bad battery cause the P182F code in a GMC Sierra?

A weak or failing battery can occasionally contribute to electrical faults, but it's not a common cause of this specific code. Checking the battery and charging system may still be helpful.

10. Do I need to clear the P182F code after repairs on my GMC Sierra?

Yes, after completing repairs, use an OBDII scanner to clear the code and verify that it does not return during a test drive.