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 845 (THEFT DETERRENT SYSTEM)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 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Trouble Code (DTC) List
| DTC | Diagnostic Procedure | Module |
|---|---|---|
|
IMPORTANT:
Before you use this table, diagnose P0601, P0602, and P0604. Refer to Diagnostic System Check - Theft Deterrent . Diagnose all Bxxxx codes prior to diagnosing any remaining Pxxxx code.
|
||
| B0688 | DTC B0688 | BCM |
| B0689 | DTC B0689 | BCM |
| B2947 | DTC B2947 | BCM |
| B2948 | DTC B2948 | BCM |
| B2957 | DTC B2957 | BCM |
| B2958 | DTC B2958 | BCM |
| B2960 | DTC B2960 | BCM |
| B3031 | DTC B3031 | BCM |
| B3033 | DTC B3033 | BCM |
| P1629 | DTC P1629 | PCM |
| P1631 | DTC P1631 | PCM |
| PXXXX Other PCM DTCs Refer to DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS in Self-Diagnostics - 2.2L. Refer to DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS in Self-Diagnostics - 3.0L. |
||
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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.