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 G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISELECTRICALGAUGESANALOG INSTRUMENT PANELSSELF-DIAGNOSTIC SYSTEMENGINE ELECTRICAL SYSTEM DIAGNOSTIC SYSTEM CHECK
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Engine Electrical System Diagnostic System Check
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Engine Electrical System Diagnostic System Check
- Ensure battery is okay and fully charged. If battery is okay, go to next step. If battery is not okay, repair or replace as necessary.
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. See Figure . 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 A: SCAN TOOL DOES NOT POWER UP in SYSTEM TESTS article in BODY CONTROL MODULES.
- Using scan tool, attempt to communicate with all modules on class 2 serial communications network. If scan tool communicates with all modules, go to next step. If scan tool does not communicate with all modules, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in SYSTEM TESTS article in BODY CONTROL MODULES.
- Select DISPLAY DTCs function on scan tool for each module. If scan tool displays any DTCs go to next step. If can tool does not display any DTCs, repair by symptom. See TROUBLESHOOTING - NO CODES - TRUCKS article in ENGINE PERFORMANCE.
- If scan tool displays DTCs which begin with "U", go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in SYSTEM TESTS article in BODY CONTROL MODULES. If other DTCs are displayed, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in BODY CONTROL MODULES - CHEVY EXPRESS & SAVANA 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.