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P1824 2018 GMC Sierra Code - Internal Mode Switch 'P' Circuit Low Voltage

Quick Answer

The diagnostic trouble code P1824 for a 2018 GMC Sierra indicates an issue with the Internal Mode Switch 'P' Circuit registering low voltage. Common causes include Faulty Internal Mode Switch, Damaged wiring or connectors in the 'P' circuit, Issues with the transmission control module. 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 GMC Sierra indicates Internal Mode Switch 'P' Circuit Low Voltage.
Common causes
Common causes include Faulty Internal Mode Switch, Damaged wiring or connectors in the 'P' circuit, Issues with the transmission control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P1824 2018 GMC Sierra Description

The diagnostic trouble code P1824 for a 2018 GMC Sierra indicates an issue with the Internal Mode Switch 'P' Circuit registering low voltage. The Internal Mode Switch (IMS) is a component of the transmission control system that helps the vehicle's computer determine the gear position. In this case, the low voltage detected in the 'P' circuit can lead to incorrect gear selection, erratic shifting, or even the transmission not engaging properly.

OBDII Code P1824 2018 GMC Sierra - Internal Mode Switch 'P' Circuit Low Voltage
P1824 2018 GMC Sierra Code - Internal Mode Switch 'P' Circuit Low Voltage

Common Causes of P1824 2018 GMC Sierra

  1. Faulty Internal Mode Switch
  2. Damaged wiring or connectors in the 'P' circuit
  3. Issues with the transmission control module
  4. Corrosion or poor connections in the circuit
  5. Electrical issues such as a blown fuse or relay

Symptoms of P1824 2018 GMC Sierra

  1. Harsh shifting
  2. Delayed engagement
  3. Transmission not shifting
  4. Decreased fuel efficiency
  5. Rough idling or stalling

How to Fix P1824 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the Internal Mode Switch, wiring, and connectors for any visible damage or corrosion.
  2. Test the Internal Mode Switch using a multimeter to check for proper voltage and continuity.
  3. Check the transmission control module for any fault codes and ensure it is functioning correctly.
  4. Repair or replace any damaged wiring, connectors, or components as necessary.
  5. Clear the trouble code from the vehicle's computer and perform a test drive to confirm the issue has been resolved.

Cost to Fix P1824 2018 GMC Sierra

The typical repair costs for addressing the Internal Mode Switch 'P' Circuit Low Voltage issue can range from $200 to $500, depending on the extent of the repairs needed. This estimate includes the cost of parts such as a new Internal Mode Switch or wiring harness, as well as labor charges. It is important to note that specific diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate based on your location and vehicle.

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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 GMC Sierra Code

1. What are the common symptoms of OBDII code P1824 in a 2018 GMC Sierra?

- Common symptoms include issues with shifting gears, the transmission not responding correctly, and the Check Engine light being illuminated.

2. What causes the Internal Mode Switch 'P' Circuit Low Voltage error code (P1824) in a 2018 GMC Sierra?

- The code P1824 is typically triggered by a fault in the internal mode switch, wiring issues, or a defective internal mode switch.

3. How serious is the Internal Mode Switch 'P' Circuit Low Voltage OBDII code in a 2018 GMC Sierra?

- This code can affect the transmission's performance, so it is recommended to address it promptly to prevent further damage or safety issues.

4. Can I continue driving my 2018 GMC Sierra with the P1824 code present?

- It is not advisable to continue driving with the P1824 code active, as it can lead to transmission problems and potentially cause further damage.

5. How can I diagnose the Internal Mode Switch 'P' Circuit Low Voltage code in my 2018 GMC Sierra?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the internal mode switch and related wiring, and conducting voltage tests.

6. What are some DIY repair tips for resolving the P1824 code in a 2018 GMC Sierra?

- DIY repair tips may include checking and repairing wiring connections, replacing the internal mode switch if faulty, and clearing the code with an OBDII scanner.

7. Is it necessary to visit a mechanic for the Internal Mode Switch 'P' Circuit Low Voltage code in a 2018 GMC Sierra?

- While some DIY repairs are possible, it is recommended to consult a professional mechanic for a proper diagnosis and repair of the P1824 code.

8. How much does it cost to fix the P1824 code in a 2018 GMC Sierra?

- The cost of fixing the P1824 code can vary depending on the exact cause of the issue, but it may involve replacing the internal mode switch or repairing wiring, which can range from $200 to $500 or more.

9. Can resetting the OBDII code P1824 in a 2018 GMC Sierra make it go away permanently?

- Resetting the code may temporarily turn off the Check Engine light, but if the underlying issue causing the P1824 code is not addressed, it is likely to reappear.

10. How can I prevent the Internal Mode Switch 'P' Circuit Low Voltage code from recurring in my 2018 GMC Sierra?

- Regular maintenance, checking for loose or damaged wiring, and promptly addressing transmission issues can help prevent the reoccurrence of the P1824 code.

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