AutoCodes – Chevrolet – P1824 Chevrolet

P1824 Chevrolet 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 Chevrolet 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 1,667

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 Chevrolet 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 Chevrolet - Internal Mode Switch 'P' Circuit Low Voltage - AutoCodes.com — P1824 Chevrolet Code - Internal Mode Switch 'P' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1824 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P1824 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P1824 2014 Chevrolet Silverado — Internal Mode Switch 'P' Circuit Low Voltage
P1824 2015 Chevrolet Silverado — Internal Mode Switch 'P' Circuit Low Voltage
P1824 2016 Chevrolet Silverado — Internal Mode Switch 'P' Circuit Low Voltage
P1824 2017 Chevrolet Silverado — Internal Mode Switch 'P' Circuit Low Voltage
P1824 2018 Chevrolet Silverado — Internal Mode Switch 'P' Circuit Low 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 P1824 Chevrolet Code

1. What are the common symptoms of OBDII code P1824 in a Chevrolet?

The common symptoms of OBDII code P1824 in a Chevrolet include issues with shifting gears, the transmission not engaging properly, and the vehicle going into limp mode.

2. What causes the Internal Mode Switch 'P' Circuit Low Voltage code in a Chevrolet?

The P1824 code in a Chevrolet is typically caused by a faulty internal mode switch (IMS), damaged wiring or connectors related to the IMS, or a malfunctioning transmission control module (TCM).

3. How serious is the P1824 OBDII code in a Chevrolet?

The P1824 code should be addressed promptly as it can lead to transmission issues and potentially affect the drivability of the vehicle. Ignoring the code may result in further damage to the transmission.

4. Can I drive my Chevrolet with the P1824 code present?

It is not recommended to drive your Chevrolet with the P1824 code present, as it can cause transmission problems and potentially leave you stranded on the road. It's best to address the issue as soon as possible.

5. How do I diagnose the Internal Mode Switch 'P' Circuit Low Voltage code in my Chevrolet?

Diagnosing the P1824 code involves using a scan tool to retrieve the code, checking the internal mode switch for proper operation, inspecting the wiring and connectors for damage, and testing the TCM for faults.

6. How much does it typically cost to repair the P1824 code in a Chevrolet?

The cost of repairing the P1824 code in a Chevrolet can vary depending on the specific cause of the issue. It may involve replacing the internal mode switch, repairing damaged wiring, or reprogramming the TCM. Costs can range from a couple of hundred dollars to over a thousand dollars.

7. Can I reset the P1824 code in my Chevrolet by disconnecting the battery?

While disconnecting the battery may temporarily clear the code, it is not a recommended method for resolving the underlying issue causing the P1824 code. The code is likely to return once the problem persists.

8. Is the Internal Mode Switch 'P' Circuit Low Voltage code a common issue in Chevrolet vehicles?

The P1824 code is not extremely common, but it can occur in Chevrolet vehicles, especially in older models or those with high mileage. Regular maintenance and timely repairs can help prevent this issue.

9. Can a DIY enthusiast repair the P1824 code in a Chevrolet?

While diagnosing and repairing the P1824 code may be challenging for a DIY enthusiast due to the complexity of transmission systems, it is possible with the right tools, knowledge, and experience. However, seeking professional help is recommended for accurate diagnosis and proper repair.

10. How long does it take to fix the Internal Mode Switch 'P' Circuit Low Voltage code in a Chevrolet?

The time it takes to fix the P1824 code in a Chevrolet can vary depending on the exact cause of the issue and the extent of the repair needed. It can range from a few hours to a full day, especially if parts need to be ordered or the TCM requires reprogramming.