AutoCodes – GMC – P1824 2016 GMC Sierra

P1824 2016 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 2016 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 228

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 2016 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 2016 GMC Sierra - Internal Mode Switch 'P' Circuit Low Voltage - AutoCodes.com — P1824 2016 GMC Sierra Code - Internal Mode Switch 'P' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1824 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the P1824 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P1824 in a 2016 GMC Sierra?

The common symptoms of OBDII code P1824 (Internal Mode Switch 'P' Circuit Low Voltage) in a 2016 GMC Sierra may include issues with shifting gears, the transmission not engaging properly, or the vehicle going into limp mode.

2. What causes the OBDII code P1824 in a 2016 GMC Sierra?

The most common cause of OBDII code P1824 in a 2016 GMC Sierra is a malfunction in the internal mode switch, which can lead to low voltage in the 'P' circuit.

3. How serious is OBDII code P1824 in a 2016 GMC Sierra?

OBDII code P1824 in a 2016 GMC Sierra can affect the proper functioning of the transmission, potentially leading to drivability issues. It is important to address this code promptly to avoid further damage.

4. Can I continue driving my 2016 GMC Sierra with OBDII code P1824?

It is not recommended to continue driving your 2016 GMC Sierra with OBDII code P1824, as it can cause further damage to the transmission. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose and repair OBDII code P1824 in my 2016 GMC Sierra?

Diagnosing and repairing OBDII code P1824 in a 2016 GMC Sierra typically involves checking the internal mode switch for proper operation, inspecting the wiring and connectors for any damage, and testing the circuit for voltage issues. Replacement of the internal mode switch may be necessary.

6. Can a DIYer fix OBDII code P1824 in a 2016 GMC Sierra?

While some experienced DIYers may be able to diagnose and repair OBDII code P1824 in a 2016 GMC Sierra, it is recommended to consult a professional mechanic or dealership for accurate diagnosis and proper repair to ensure the issue is resolved correctly.

7. How much does it cost to repair OBDII code P1824 in a 2016 GMC Sierra?

The cost to repair OBDII code P1824 in a 2016 GMC Sierra can vary depending on the extent of the issue, the parts needed for repair, and labor costs. It is advisable to get a few quotes from different repair shops or dealerships to compare prices.

8. Will resetting the OBDII code P1824 in my 2016 GMC Sierra make it go away?

Resetting the OBDII code P1824 in a 2016 GMC Sierra may temporarily clear the error code, but if the underlying issue is not addressed and repaired, the code is likely to return. It is essential to diagnose and fix the root cause of the problem.

9. Is OBDII code P1824 covered under warranty for a 2016 GMC Sierra?

Whether OBDII code P1824 is covered under warranty for a 2016 GMC Sierra depends on the specific warranty coverage and the age/mileage of the vehicle. It is recommended to check with the dealership or refer to the vehicle's warranty documentation for more information.

10. Can OBDII code P1824 in a 2016 GMC Sierra cause permanent damage if not addressed promptly?

If OBDII code P1824 in a 2016 GMC Sierra is not addressed promptly, it can potentially cause permanent damage to the transmission or other related components. It is best to address the issue as soon as possible to prevent further damage.