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 PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESBODY CONTROL MODULESSELF-DIAGNOSTIC SYSTEMAUTOMATIC TRANSMISSION DIAGNOSTIC SYSTEM CHECK
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
Automatic Transmission Diagnostic System Check
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Automatic Transmission Diagnostic System Check
NOTE:
Check for applicable service bulletins before proceeding with this test. Perform this test only if there is a driveability complaint or if you have been directed to this table from another section in the service information. Do not turn ignition OFF when performing this diagnostic procedure. Do not clear DTCs unless instructed by this diagnostic procedure.
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. 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 under SYSTEM TESTS.
- If Malfunction Indication Light (MIL) is illuminated, go to next step. If MIL is not illuminated, repair MIL circuit as necessary. See ANALOG INSTRUMENT PANELS - CHEVY EXPRESS & SAVANA article.
- Using scan tool, attempt to communicate with Powertrain Control Module (PCM). If scan tool communicates with PCM, go to next step. If scan tool does not communicate with PCM, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Select DISPLAY DTCs function on scan tool for PCM. If scan tool displays any DTCs, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, repair by symptom. See appropriate ELECTRONIC CONTROLS in AUTOMATIC TRANSMISSIONS.
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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.