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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.3L)SELF-DIAGNOSTIC SYSTEMPOWERTRAIN DIAGNOSTIC SYSTEM CHECK
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Powertrain Diagnostic System Check

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Powertrain Diagnostic System Check
WARNING: This page is about a different variant/trim than selected.

The powertrain diagnostic system check determines:

  • If Malfunction Indicator Light (MIL) operates.
  • If VCM is operating and can recognize a fault.
  • If any DTCs are stored.

NOTE: Check for applicable Technical Service Bulletins (TSB) before proceeding. Perform the following procedure only if a driveability complaint exists, or if you were sent here from another procedure or article. DO NOT turn ignition off during the following procedure or clear DTCs unless instructed to do so.
  1. Install scan tool. If scan tool powers-up, go to next step. If scan tool does not power-up, see TEST A: SCAN TOOL DOES NOT POWER-UP under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Turn ignition on, engine off. Attempt to establish communication with PCM, Vehicle Theft Deterrent (VTD) module, Instrument Panel Cluster (IPC), Electronic Brake And Traction Control Module (EBCM), and HVAC. If scan tool communicates with all listed control modules, go to next step. If scan tool does not communicate with all listed modules, see TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS II DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Attempt to start engine. If engine starts and idles, go to next step. If engine cranks, but does not start, see NO-START DIAGNOSIS in appropriate BASIC DIAGNOSTIC PROCEDURES article.
  4. Select DTC display function for PCM, VTD, IPC, EBCM and HVAC. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, go to step  8.
  5. Using scan tool, save or capture powertrain DTC information. After saving information, go to next step.
  6. If scan tool displays any DTCs which begin with "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS II DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If scan tool does not display any DTCs which begin with "U", go to next step.
  7. If scan tool displays any DTCs which begin with "P", see DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  8. If concern is with A/T, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS. If concern is not with A/T, go to next step.
  9. If concern is with Inspection/Maintenance (I/M) testing, see INSPECTION/MAINTENANCE PROCEDURES . If concern is not with I/M testing, see appropriate test in appropriate TROUBLE SHOOTING - NO CODES article.
RENDER: 1.0x

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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.