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P1824 2017 GMC Sierra Code - Internal Mode Switch 'P' Circuit Low Voltage

Quick Answer

The diagnostic trouble code P1824 for a 2017 GMC Sierra indicates a problem with the Internal Mode Switch 'P' Circuit Low Voltage. Common causes include Faulty Internal Mode Switch sensor, 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 2017 GMC Sierra indicates Internal Mode Switch 'P' Circuit Low Voltage.
Common causes
Common causes include Faulty Internal Mode Switch sensor, 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 18, 2024
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Code P1824 2017 GMC Sierra Description

The diagnostic trouble code P1824 for a 2017 GMC Sierra indicates a problem with the Internal Mode Switch 'P' Circuit Low Voltage. The Internal Mode Switch (IMS) is a component of the transmission control system that helps the vehicle's computer determine the current gear selection. In this case, the 'P' circuit refers to the park position. When the voltage in this circuit is detected to be lower than the specified range, the code is triggered, indicating a potential issue with the IMS.

OBDII Code P1824 2017 GMC Sierra - Internal Mode Switch 'P' Circuit Low Voltage
P1824 2017 GMC Sierra Code - Internal Mode Switch 'P' Circuit Low Voltage

Common Causes of P1824 2017 GMC Sierra

  1. Faulty Internal Mode Switch sensor
  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 2017 GMC Sierra

  1. Difficulty shifting into park or engaging the transmission
  2. Vehicle not starting or moving in park position
  3. Check engine light illuminated on the dashboard
  4. Erratic shifting behavior
  5. Transmission slipping or hesitation

How to Fix P1824 2017 GMC Sierra

  1. Perform a thorough diagnostic scan to retrieve the trouble codes and pinpoint the issue.
  2. Inspect the Internal Mode Switch sensor and wiring for any signs of damage or corrosion.
  3. Test the voltage in the 'P' circuit to determine if it falls within the specified range.
  4. Replace the Internal Mode Switch sensor if it is found to be faulty.
  5. Clear the trouble codes, reset the system, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1824 2017 GMC Sierra

The typical repair costs for addressing the Internal Mode Switch 'P' Circuit Low Voltage issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of replacing the Internal Mode Switch sensor and addressing any related wiring issues can range from $200 to $500, including parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle specifics.

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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 2017 GMC Sierra Code

1. What does the OBDII code P1824 mean on a 2017 GMC Sierra?

P1824 indicates that the Internal Mode Switch (IMS) "P" circuit is experiencing low voltage, which may affect the transmission's ability to detect the proper gear selection.

2. What are the common symptoms of code P1824 in a 2017 GMC Sierra?

Symptoms may include the transmission being stuck in Park, difficulty shifting gears, an illuminated check engine light, and erratic transmission behavior.

3. What causes the P1824 code to appear on a 2017 GMC Sierra?

This code is commonly caused by a faulty Internal Mode Switch, damaged wiring or connectors in the switch circuit, or issues with the transmission control module (TCM).

4. Can I drive my 2017 GMC Sierra with the P1824 code?

Driving with the P1824 code is not recommended, as it may lead to further transmission issues or leave the vehicle stuck in Park or another gear.

5. How do I diagnose the P1824 code in my 2017 GMC Sierra?

Diagnosis typically involves inspecting the IMS wiring and connectors for damage, testing the IMS for proper function, and using a scan tool to monitor voltage readings in the "P" circuit.

6. How can I fix the P1824 code on a 2017 GMC Sierra?

Repairs may include replacing the Internal Mode Switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the TCM if necessary.

7. How much does it cost to fix the P1824 code on a 2017 GMC Sierra?

Repair costs can vary, but replacing the Internal Mode Switch typically ranges from $200 to $500, including parts and labor.

8. Can a dead battery cause the P1824 code on a 2017 GMC Sierra?

While unlikely, a severely low or dead battery can cause electrical issues that might trigger the code. Checking the battery and charging system is a good first step.

9. Does the P1824 code always mean the Internal Mode Switch is faulty?

Not necessarily. The issue could also stem from damaged wiring, poor connections, or a malfunctioning TCM rather than the switch itself.

10. Will clearing the P1824 code fix the issue on a 2017 GMC Sierra?

Clearing the code may temporarily turn off the check engine light, but it won’t resolve the underlying problem. Proper diagnosis and repair are required to prevent the code from returning.

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