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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 19 (HVAC SYSTEMS - MANUAL)SELF-DIAGNOSTIC SYSTEMDIAGNOSTIC SYSTEM CHECK
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Diagnostic System Check
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Diagnostic System Check
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- Did you review the DESCRIPTION & OPERATION section? If so, go to next step. If not, review DESCRIPTION & OPERATION .
- Connect scan tool to data Link Connector (DLC). DLC is located under instrument panel, near steering column. If scan tool powers up, go to next step. If scan tool does not power up, go to appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
- Turn ignition on. Attempt to establish communications with Powertrain Control Module (PCM). If communication is established, go to next step. If communication is not established, go to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
- Following scan tool manufacturers instructions, select DISPLAY DTCs function for PCM. If any Diagnostic Trouble Codes (DTCs) are displayed, go to next step. If no DTCs are displayed, perform procedure for appropriate symptom. See SYMPTOM TESTS .
- If scan tool displays any DTCs beginning with "U", go to appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If no DTCs beginning with "U" are displayed, go to next step.
- If scan tool displays any DTCs beginning with "P", see DIAGNOSTIC TESTS . If no DTCs beginning with "P" are displayed, go to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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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.