AutoCodes – GMC – P1824 2015 GMC Sierra

P1824 2015 GMC Sierra Code - Internal Mode Switch 'P' Circuit Low 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: P1824 2015 GMC Sierra indicates Internal Mode Switch 'P' Circuit Low 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 208

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 P1824 2015 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 less than 0.7 V, for 1.75 s.

OBDII Code P1824 2015 GMC Sierra - Internal Mode Switch 'P' Circuit Low Voltage - AutoCodes.com — P1824 2015 GMC Sierra Code - Internal Mode Switch 'P' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1824 2015 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 P1824 2015 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 P1824 2015 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 P1824 2015 GMC Sierra code?

Need more information on how to fix the P1824 2015 GMC Sierra code? Get Access to Factory Service Manuals

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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 P1824 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P1824 in a 2015 GMC Sierra?

The common symptoms of code P1824 include issues with shifting gears, difficulty engaging gears, and the transmission may stay in one gear.

2. What does the Internal Mode Switch 'P' Circuit Low Voltage mean in a 2015 GMC Sierra?

The Internal Mode Switch 'P' Circuit Low Voltage indicates a problem with the circuit that controls the transmission range selection.

3. What are the possible causes of OBDII code P1824 in a 2015 GMC Sierra?

Possible causes of code P1824 include a faulty internal mode switch, damaged wiring or connectors in the circuit, or a problem with the transmission control module.

4. How serious is OBDII code P1824 in a 2015 GMC Sierra?

Code P1824 should be addressed promptly as it can lead to transmission issues and affect the drivability of the vehicle.

5. Can I continue driving my 2015 GMC Sierra with OBDII code P1824?

It is not recommended to continue driving your vehicle with code P1824 as it can lead to further damage to the transmission.

6. How can I diagnose and repair OBDII code P1824 in a 2015 GMC Sierra?

Diagnosis of code P1824 involves checking the internal mode switch, inspecting the circuit for any damage, and testing the transmission control module. Repair may involve replacing the internal mode switch or repairing the wiring/connectors.

7. Is it possible to reset OBDII code P1824 in a 2015 GMC Sierra?

Resetting the code without addressing the underlying issue will not solve the problem. It is important to diagnose and repair the root cause of code P1824.

8. Can a DIYer fix OBDII code P1824 in a 2015 GMC Sierra?

While some basic diagnosis steps can be performed by a knowledgeable DIYer, fixing code P1824 may require advanced tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

9. How much does it cost to fix OBDII code P1824 in a 2015 GMC Sierra?

The cost of fixing code P1824 can vary depending on the underlying issue, parts needed for repair, and labor costs. It is advisable to get a diagnostic from a qualified mechanic to determine the exact cost.

10. How can I prevent OBDII code P1824 from appearing again in my 2015 GMC Sierra?

Regular maintenance, such as checking the transmission system and wiring connections, can help prevent code P1824 from reoccurring. Addressing any issues promptly can also help avoid future occurrences of this code.