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 528 (DATA LINK COMMUNICATION 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 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(s) |
|---|---|---|
| U0001 | DTC U0001 | ECU |
| U0101 | DTC U0100-U0299 | ECU |
| U1000 | DTC U1000 and U1255 | BCM, EBCM, IPC, HUD, HVAC, MSM, PCM, Radio, RSE, SDM, Theft Deterrent Control Module, VCIM |
| U1016 | DTC U1001-U1254 | BCM, EBCM, IPC, Radio, SDM |
| U1017 | DTC U1001-U1254 | BCM, EBCM, IPC, Radio, SDM, TCM |
| U1024 | DTC U1001-U1254 | BCM, EBCM, ECM, IPC, Radio, SDM |
| U1040 | DTC U1001-U1254 | BCM, ECM, IPC, SDM |
| U1064 | DTC U1001-U1254 | ECM, IPC, MSM, Radio, SDM |
| U1088 | DTC U1001-U1254 | IPC |
| U1096 | DTC U1001-U1254 | HUD, SDM |
| U1153 | DTC U1001-U1254 | ECM, BCM |
| U1128 | DTC U1001-U1254 | BCM, RSE, VCIM |
| U1137 | DTC U1001-U1254 | BCM, Radio |
| U1192 | DTC U1001-U1254 | BCM, ECM |
| U1255 | DTC U1000 and U1255 | BCM, EBCM, IPC, HUD, HVAC, MSM, PCM, Radio, SDM, Theft Deterrent Control Module, VCIM |
| U1300 | DTC U1300, U1301, or U1305 | BCM, EBCM, ECM, IPC, HUD, HVAC, MSM, PCM, Radio, RSE, SDM, TCM, Theft Deterrent Control Module, VCIM |
| U1301 | DTC U1300, U1301, or U1305 | BCM, EBCM, ECM, IPC, HUD, HVAC, MSM, PCM, Radio, RSE, SDM, TCM, Theft Deterrent Control Module, VCIM |
| U1305 | DTC U1300, U1301, or U1305 | BCM, EBCM, ECM, IPC, HUD, HVAC, MSM, PCM, Radio, RSE, SDM, TCM, Theft Deterrent Control Module, VCIM |
| U2105 | DTC U2105 | TCM |
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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.