Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 229 (CRUISE CONTROL SYSTEM)DIAGNOSTIC TESTSDTC P1574: BRAKELIGHT SWITCH CIRCUITCONDITIONS FOR RUNNING THE DTC
1999 GMC Forward Control 5.7 R, Automatic
Conditions For Running The DTC
1999 GMC Forward Control 5.7 R, AutomaticSECTION Conditions For Running The DTC
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- DTCs P0502, P0503, P0719, P0724, P1575 and P1602 not set.
- Traction control and anti-lock brake systems have not failed.
- Traction control and anti-lock brake systems are not active.
- Non-drive wheel speed goes above 20 MPH (32 KM/H) and then doesn't go below 4 MPH (7 KM/H).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.