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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 9 (BODY CONTROL MODULES)SELF-DIAGNOSTIC SYSTEMPOWER SUN ROOF SYSTEM DIAGNOSTIC SYSTEM CHECK
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Power Sun Roof System Diagnostic System Check
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Power Sun Roof System Diagnostic System Check
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use this check as starting point for any power sun roof system complaint.
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST D: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS.
- Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Body Control Module (BCM). If communication with BCM is possible, go to next step. If communication with BCM is not possible, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Select BCM display DTCs function. Scan tool should display NO DTCS FOUND. If any DTCs are listed, go to next step. If scan tool does not display any DTCs, perform appropriate symptom test. See SYSTEM TESTS in appropriate POWER SUN ROOFS article.
- Using scan tool, retrieve DTCs. If DTCs U1000-U1305 are not present, go to next step. If DTCs U1000-U1305 are present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . Repair as necessary.
- Check for DTC B1000. If scan tool displays DTC B1000, go to DTC B1000: CONTROL MODULE MALFUNCTION under DIAGNOSTIC TESTS. If scan tool does not display DTC B1000, go to next step.
- Check for DTC B1477 or B1478. If scan tool displays DTC B1477 or B1478, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . Repair as necessary. If scan tool does not display DTC B1477 or B1478, go to next step.
- Check for DTC B1507 or B1508. If scan tool displays DTC B1507 or B1508, perform appropriate test. See appropriate GENERATORS & REGULATORS article. If scan tool does not display any DTCs, perform appropriate symptom test. See SYSTEM TESTS in appropriate POWER SUN ROOFS article.
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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.