Stoplamp Switch Circuit
2004-2007 Buick Rainier 4.2L I6
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
Common Questions
What does code P1574 mean on a 2004-2007 Buick Rainier?
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 Buick Rainier?
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 2004-2007 Buick Rainier?
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.