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)
1999 GMC Forward Control 5.7 R, Automatic
Section 229 (Cruise Control System)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 229 (Cruise Control System)
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.
- Description & Operation
- Component Locations
- Programming
- Adjustments
- Trouble Shooting
- Self-Diagnostic System
- Diagnostic Tests
- DTC P0574: Powertrain Control Module Detects High Vehicle Speed
- DTC P1554: Powertrain Control Module Detects Cruise Engaged Signal
- DTC P1560: Cruise Control Engaged With Vehicle In Neutral Or Park
- DTC P1564: Powertrain Control Module Detects Rapid Acceleration
- DTC P1566: Powertrain Control Module Detects High Engine Speed
- DTC P1567: Traction Control System Applied Brakes
- DTC P1570: Traction Control Active Cruise Disabled
- DTC P1574: BRAKELIGHT Switch Circuit
- DTC P1585: Cruise Control Inhibit Output Circuit
- System Tests
- Removal & Installation
- Wiring Diagrams
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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.