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 746 (SUSPENSION CONTROL SYSTEM - SUSPENSION DAMPING)
1999 GMC Forward Control 5.7 R, Automatic
Section 746 (Suspension Control System - Suspension Damping)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 746 (Suspension Control System - Suspension Damping)
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Electronic Suspension Control
- Diagnostic System Check - Electronic Suspension Control
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B2795
- DTC B3577
- DTC C0550
- DTC C0563
- DTC C0577, C0579, C0582, C0584, C0587, C0589, C0592, or C0594
- DTC C0578, C0583, C0588, or C0593
- DTC C0615, C0620, C0625 or C0630
- DTC C0665
- DTC C0690, C0691, or C0693
- DTC C0695
- DTC C0710
- DTC P1652
- Symptoms - Electronic Suspension Control
- Soft and Non-Uniform Ride
- Repair Instructions
- Description and Operation
- Special Tools and Equipment
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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.