AutoCodes – Chevrolet – P1824 2018 Chevrolet Silverado

P1824 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 243

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Internal Mode Switch 'P' Circuit Low Voltage - AutoCodes.com — P1824 2018 Chevrolet Silverado Code - Internal Mode Switch 'P' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1824 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P1824 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1824 in a 2018 Chevrolet Silverado?

The common symptoms of code P1824 include issues with shifting gears, erratic shifting patterns, and potential difficulty starting the vehicle.

2. What does the Internal Mode Switch 'P' Circuit Low Voltage mean for a 2018 Chevrolet Silverado?

The Internal Mode Switch 'P' Circuit Low Voltage indicates a problem with the transmission range sensor, specifically related to low voltage detected in the circuit.

3. What are the possible causes of OBDII code P1824 in a 2018 Chevrolet Silverado?

Possible causes of code P1824 include a faulty internal mode switch, damaged wiring or connectors in the circuit, low voltage supply to the switch, or a malfunctioning transmission control module.

4. How can I diagnose OBDII code P1824 in my 2018 Chevrolet Silverado?

Diagnosing code P1824 involves checking the internal mode switch for proper operation, inspecting the wiring and connectors for damage, testing the voltage supply to the switch, and verifying the transmission control module functionality.

5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P1824?

It is not recommended to drive your vehicle with code P1824, as it can lead to further transmission issues and potential safety hazards. It is best to address the problem promptly.

6. How can I repair OBDII code P1824 in a 2018 Chevrolet Silverado?

Repairing code P1824 may involve replacing the internal mode switch, repairing damaged wiring or connectors, ensuring proper voltage supply, or reprogramming the transmission control module as necessary.

7. Is it possible to reset OBDII code P1824 in a 2018 Chevrolet Silverado without fixing the issue?

Resetting the code without addressing the underlying problem will only temporarily clear the error code. To prevent it from reoccurring, it is essential to diagnose and repair the root cause of code P1824.

8. Can a DIY enthusiast fix OBDII code P1824 in a 2018 Chevrolet Silverado?

Depending on your mechanical skills and access to tools, some DIY enthusiasts may be able to diagnose and repair code P1824. However, dealing with transmission-related issues may require specialized knowledge and equipment, so professional assistance is often recommended.

9. How much does it cost to fix OBDII code P1824 in a 2018 Chevrolet Silverado?

The cost of repairing code P1824 can vary depending on the specific cause of the issue, parts needed for replacement, and labor charges. It is advisable to consult a mechanic for an accurate estimate.

10. Can OBDII code P1824 in a 2018 Chevrolet Silverado cause further damage if left untreated?

Yes, ignoring code P1824 can potentially lead to more severe transmission problems, such as gear slippage, transmission failure, or safety risks while driving. It is best to address the issue promptly to prevent further damage.