Engine-CodesCadillac – P1574 Cadillac

P1574 Cadillac Code - Stop Lamp Switch Circuit

Quick Answer

The P1574 diagnostic trouble code (DTC) for Cadillac vehicles specifically refers to an issue with the stop lamp switch circuit. Common causes include Faulty stop lamp switch, Wiring issues, such as a short or open circuit, Malfunctioning electronic control module (ECM). 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 Cadillac indicates Stop Lamp Switch Circuit.
Common causes
Common causes include Faulty stop lamp switch, Wiring issues, such as a short or open circuit, Malfunctioning electronic control module (ECM).
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.
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1574 Cadillac Description

The P1574 diagnostic trouble code (DTC) for Cadillac vehicles specifically refers to an issue with the stop lamp switch circuit. The stop lamp switch is a crucial component of the vehicle's braking system, as it is responsible for activating the brake lights when the brake pedal is pressed. When this switch malfunctions or fails, it can have serious implications for the vehicle's safety and performance.

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

Common Causes of P1574 Cadillac

  1. Faulty stop lamp switch.
  2. Wiring issues, such as a short or open circuit.
  3. Malfunctioning electronic control module (ECM).
  4. Corrosion or damage to the electrical connectors.
  5. Previous water damage to the brake light circuit.

Symptoms of P1574 Cadillac

  1. Check engine light is illuminated on the dashboard.
  2. Brake lights do not illuminate when the brake pedal is pressed.
  3. Cruise control system may not function properly.
  4. Difficulty shifting out of park.

How to Fix P1574 Cadillac

  1. Begin by diagnosing the root cause of the issue using a diagnostic scan tool.
  2. Inspect the stop lamp switch and wiring for any visible damage or corrosion.
  3. Test the continuity of the stop lamp switch and replace if necessary.
  4. Repair any wiring issues or replace damaged connectors.
  5. Clear the DTC and test the brake lights to ensure they are functioning properly.

Cost to Fix P1574 Cadillac

The cost of repairing a P1574 code for a Cadillac vehicle can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair costs for this issue can range from $100 to $300, including parts and labor. It's important to note that diagnostic time and labor rates can vary, so it's recommended to check with local repair shops for a more precise estimate based on your location and vehicle model.

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.

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