Stoplamp Switch Circuit
2000-2005 Chevrolet Impala 3.4L V6
Description
The PCM detected a malfunction in the brake (stoplight) switch circuit. The brake switch signal is used by multiple systems including cruise control, torque converter clutch, and brake/shift interlock.
Symptoms
- Cruise control not disengaging when braking
- Brake lights staying on or not working
- Transmission not downshifting when braking
- Shift interlock not releasing
- Check Engine Light
Common Causes
- Faulty brake light switch
- Misadjusted brake switch
- Blown brake light fuse
- Damaged wiring to brake switch
- Brake switch connector issue
Diagnostic Steps
- Test brake light switch operation
- Check brake light fuse
- Inspect brake switch adjustment
- Test circuit voltage at switch connector
- Check brake lights for proper operation
Repair Notes
Adjust or replace brake light switch. Check fuse and wiring.
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1574 on Other Vehicles
Chevrolet Astro
1995-2005 4.3L V6 Vortec
Chevrolet Avalanche
2002-2006 5.3L V8 Vortec
Chevrolet Avalanche
2002-2006 8.1L V8 Vortec
Chevrolet Avalanche
2007-2013 5.3L V8 Vortec
Chevrolet Avalanche
2007-2013 6.0L V8 Vortec
Chevrolet Aveo
2012-2018 1.6L I4
Chevrolet Beat
2018-2021 1.2L I4
Chevrolet Beretta
1990-1996 2.2L I4
Common Questions
What does code P1574 mean on a 2000-2005 Chevrolet Impala?
P1574 stands for "Stoplamp Switch Circuit". The PCM detected a malfunction in the brake (stoplight) switch circuit. The brake switch signal is used by multiple systems including cruise control, torque converter clutch, and brake/shift interlock.
What are the symptoms of P1574 on a Chevrolet Impala?
Common symptoms of P1574 include: Cruise control not disengaging when braking, Brake lights staying on or not working, Transmission not downshifting when braking, Shift interlock not releasing, Check Engine Light.
What causes P1574 on a 2000-2005 Chevrolet Impala?
Common causes of P1574 include: Faulty brake light switch, Misadjusted brake switch, Blown brake light fuse, Damaged wiring to brake switch, Brake switch connector issue.