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 170 (BODY CONTROL MODULES)DIAGNOSTIC TESTSDTC U1161-U1163 OR U1170: DRIVER DOOR MODULE COMMUNICATION MALFUNCTIONCODE ENABLE CRITERIA
1999 GMC Forward Control 5.7 R, Automatic
Code Enable Criteria
1999 GMC Forward Control 5.7 R, AutomaticSECTION Code Enable Criteria
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.
The following must occur for DTC to run:
- DTCs B1327, B1328, U1300 and U1301 must not have a current status.
- Driver Door Module (DDM) must have power.
- DDM must have received an input, a power door serial data message, or a Class 2 "wake up" message.
- DTC will set when a door module or driver door switch assembly does not respond to DDM request within two seconds.
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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.