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 533 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC TROUBLE CODE (DTC) LIST
1999 GMC Forward Control 5.7 R, Automatic
Diagnostic Trouble Code (DTC) List
1999 GMC Forward Control 5.7 R, AutomaticSECTION Diagnostic Trouble Code (DTC) List
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Trouble Code (DTC) List
| DTC | Diagnostic Procedure | Module |
|---|---|---|
| B1354 | DTC B1354 | Body Control Module (BCM) |
| B1397 | DTC B1397 | Body Control Module (BCM) |
| B1398 | DTC B1398 | Body Control Module (BCM) |
| B1482 | DTC B1482 | Body Control Module (BCM) |
| B2532 | DTC B2532 | Body Control Module (BCM) |
| B2533 | DTC B2533 | Body Control Module (BCM) |
| B2577 | DTC B2577 | Body Control Module (BCM) |
| B2578 | DTC B2578 | Body Control Module (BCM) |
| B2587 | DTC B2587 | Body Control Module (BCM) |
| B2588 | DTC B2588 | Body Control Module (BCM) |
| B2602 | DTC B2602 | Body Control Module (BCM) |
| B2603 | DTC B2603 | Body Control Module (BCM) |
| B2613 | DTC B2613 | Body Control Module (BCM) |
| B2617 | DTC B2617 | Body Control Module (BCM) |
| B2618 | DTC B2618 | Body Control Module (BCM) |
| B2627 | DTC B2627 | Body Control Module (BCM) |
| B2628 | DTC B2628 | Body Control Module (BCM) |
| B2645 | DTC B2645 | Body Control Module (BCM) |
| B2647 | DTC B2647 | Body Control Module (BCM) |
| B2648 | DTC B2648 | Body Control Module (BCM) |
| B2665 | DTC B2665 | Body Control Module (BCM) |
| B2742 | DTC B2742 | Body Control Module (BCM) |
| B3840 | DTC B3840 | Body Control Module (BCM) |
| B3841 | DTC B3841 | Body Control Module (BCM) |
| B3857 | DTC B3857 | Body Control Module (BCM) |
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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.