Chevrolet P1574: Stoplamp Switch Circuit Malfunction

What Does The Chevrolet P1574 Code Mean?

Engine speed over 700 rpm (wheel speed indicates more than 30 mph in order to enable the test, and the test will disable when wheel speed is less than 10 mph), then vehicle speed decreased at a rate greater than 10.4 mph in 1 second.

What Are The Potential Causes Of The Chevrolet P1574 Code?

• Brake switch circuit is open, shorted to ground or shorted to B+
• Brake switch power circuit is open (test STOP/HAZARD fuse)
• Brake switch is out-of-adjustment, damaged or has failed
• EBTCM has failed

How Can You Fix The Chevrolet P1574 Code?

Inspect for the following:

Important: Remove any debris from the connector
surfaces before servicing a component. Inspect
the connector gaskets when diagnosing or replacing a
component. Ensure that the gaskets are installed
correctly. The gaskets prevent contaminate intrusion.

• Poor terminal connection.
• Damaged harness.
• Inspect the PCM and the engine grounds for
  clean and secure connections.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Check This Video For Reference

Reference Sources

• 2000 Chevrolet Camaro and Pontiac Firebird Service Manual – Volume 1, page 842.
• GM, 2013, Service Bullettin – Prior To Any Circuit Testing.