AutoCodes – Ford – P1574 Ford

P1574 Ford Code - Stop Lamp Switch Circuit

Quick Answer

This diagnostic test functions on the assumption that a sudden decrease in vehicle speed is caused by a brake pedal application. Common causes include Stop Lamp Switch out of adjustment, Faulty Stop Lamp Switch, Stop Lamp Switch harness is open or shorted. 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 Ford indicates Stop Lamp Switch Circuit.
Common causes: Common causes include Stop Lamp Switch out of adjustment, Faulty Stop Lamp Switch, Stop Lamp Switch harness is open or shorted.
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 5,396

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 18, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1574 Ford Description

This diagnostic test functions on the assumption that a sudden decrease in vehicle speed is caused by a brake pedal application. When the Powertrain Control Module (PCM) detects that there is a 4.2 km/h (2.6 mph) or greater decrease in vehicle speed within 0.25 seconds and a transition of the Torque Converter Clutch (TCC) brake/cruise release switch without a transition of the stop lamp switch, the PCM sets DTC P1574.

OBDII Code P1574 Ford - Stop Lamp Switch Circuit - AutoCodes.com — P1574 Ford Code - Stop Lamp Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P1574 Ford?

Stop Lamp Switch out of adjustment
Faulty Stop Lamp Switch
Stop Lamp Switch harness is open or shorted
Stop Lamp Switch circuit poor electrical connection

How to Fix the DTC P1574 Ford?

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 P1574 Ford 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.

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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.