P1574moderate severityPowertrain
Stoplamp Switch Circuit
on 2011 Chevrolet Express 6.0L V8 Vortec · RWD
What this code means
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 on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1