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Engine-Codes – GMC – P1574 GMC

P1574 GMC Code - Stop Lamp Switch Circuit

Quick Answer

The P1574 GMC code refers to an issue with the Stop Lamp Switch Circuit in the vehicle. Common causes include Faulty stop lamp switch: The most common cause of this code is a defective stop lamp switch, Wiring issues: Problems with the wiring connected to the stop lamp switch can also trigger this code, Brake pedal position sensor malfunction: Issues with the sensor that detects the position of the brake pedal can lead to the P1574 code. 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
P1574 GMC indicates Stop Lamp Switch Circuit.
Common causes
Common causes include Faulty stop lamp switch: The most common cause of this code is a defective stop lamp switch, Wiring issues: Problems with the wiring connected to the stop lamp switch can also trigger this code, Brake pedal position sensor malfunction: Issues with the sensor that detects the position of the brake pedal can lead to the P1574 code.
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 Aug 19, 2024
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Code P1574 GMC Description

The P1574 GMC code refers to an issue with the Stop Lamp Switch Circuit in the vehicle. The stop lamp switch is a critical component that sends a signal to the vehicle's brake lights when the brake pedal is pressed. This signal is essential for informing other drivers on the road of a vehicle's braking actions. When this circuit malfunctions, it can lead to problems with the brake lights not illuminating properly, which can compromise the safety of the vehicle.

OBDII Code P1574 GMC - Stop Lamp Switch Circuit
P1574 GMC Code - Stop Lamp Switch Circuit

Common Causes of P1574 GMC

  1. Faulty stop lamp switch: The most common cause of this code is a defective stop lamp switch.
  2. Wiring issues: Problems with the wiring connected to the stop lamp switch can also trigger this code.
  3. Brake pedal position sensor malfunction: Issues with the sensor that detects the position of the brake pedal can lead to the P1574 code.
  4. Loose or corroded connections: Loose or corroded electrical connections related to the stop lamp switch circuit can cause the code to be set.

Symptoms of P1574 GMC

  1. Brake lights not working: One of the most common symptoms of this code is the brake lights failing to illuminate when the brake pedal is pressed.
  2. Cruise control not working: The malfunctioning stop lamp switch circuit can also impact the operation of the vehicle's cruise control system.
  3. Difficulty shifting out of park: In some cases, the issue with the stop lamp switch circuit can cause difficulty in shifting the vehicle out of park.
  4. Check Engine Light: The Check Engine Light may illuminate on the dashboard as a result of this code being triggered.

How to Fix P1574 GMC

  1. Inspect the stop lamp switch: Begin by inspecting the stop lamp switch for any signs of damage or malfunction. Replace the switch if necessary.
  2. Check the wiring: Examine the wiring connected to the stop lamp switch for any breaks, frays, or corrosion. Repair or replace any damaged wiring.
  3. Test the brake pedal position sensor: Verify the functionality of the brake pedal position sensor and replace it if it is found to be faulty.
  4. Check electrical connections: Ensure all electrical connections related to the stop lamp switch circuit are secure and free of corrosion.

Cost to Fix P1574 GMC

The typical repair costs for addressing the P1574 GMC code can range from $100 to $300, depending on the extent of the issue and the specific components that need to be replaced. It's important to consider the labor costs involved in diagnosing and repairing the problem, which can vary based on the factors mentioned above. It's recommended to consult with a qualified mechanic to get an accurate estimate for this repair.

When is the Code Detected?

The Powertrain Control Module (PCM) does not detect a stop lamp switch transition

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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 P1574 GMC Code

1. What are common symptoms of OBDII code P1574 GMC (Stop Lamp Switch Circuit)?

Common symptoms include the brake lights staying on or not working properly, the cruise control not engaging, and the inability to shift out of park.

2. What are possible causes of OBDII code P1574 GMC?

Possible causes include a faulty stop lamp switch, a problem with the brake pedal position sensor, a wiring issue in the circuit, or a malfunction in the vehicle's computer system.

3. How can I diagnose the cause of OBDII code P1574 GMC?

You can diagnose the issue by checking the stop lamp switch for proper operation, inspecting the brake pedal position sensor, examining the wiring for any damage, and using an OBDII scanner to read the trouble codes.

4. Can I still drive my vehicle with OBDII code P1574 GMC?

It is not recommended to drive your vehicle with this code as it can affect the proper functioning of your brake lights and potentially lead to unsafe driving conditions.

5. How can I repair OBDII code P1574 GMC?

To repair this code, you may need to replace the stop lamp switch, repair any damaged wiring, or recalibrate the brake pedal position sensor. It is advisable to seek professional help for accurate diagnosis and repair.

6. Will OBDII code P1574 GMC cause my vehicle to fail an emissions test?

While this code is related to the stop lamp switch circuit and not directly related to emissions, it is still important to address and repair the issue to ensure the overall health and safety of your vehicle.

7. Is OBDII code P1574 GMC a common issue in GMC vehicles?

Yes, this code can be a common issue in GMC vehicles, particularly in models with electronic brake systems and cruise control features.

8. Can a DIY enthusiast fix OBDII code P1574 GMC at home?

Some basic repairs related to this code, such as replacing the stop lamp switch, can be done at home by DIY enthusiasts with the necessary tools and knowledge. However, more complex issues may require professional assistance.

9. How much does it cost to repair OBDII code P1574 GMC at a mechanic?

The cost of repairing this code can vary depending on the specific cause of the issue, the labor rates of the mechanic, and the cost of any parts that need to be replaced. It is advisable to get a few quotes from different mechanics for comparison.

10. Can OBDII code P1574 GMC cause other problems in my vehicle?

While this code specifically relates to the stop lamp switch circuit, unresolved issues with it can potentially lead to other problems such as issues with the cruise control system, shifting gears, or overall electrical malfunctions in the vehicle.

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