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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 249 (ENGINE CONTROLS - SELF-DIAGNOSTICS)SELF-DIAGNOSTIC SYSTEMDIAGNOSTIC SYSTEM CHECK - ENGINE COOLINGDIAGNOSTIC PROCEDURE
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Diagnostic Procedure

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. The Diagnostic System Check will provide the following information:
    • The identification of the control module(s) which command the system.
    • The ability of the control module(s) to communicate through the serial data circuit.
    • The identification of any stored Diagnostic Trouble Codes (DTCs) and their status.
    The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
  2. Install a scan tool. Does the scan tool turn ON? If yes, go to next step. If no, see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Turn ON the ignition, with the engine OFF. Attempt to establish communication with the PCM. If you are using a Tech 2Ā®, obtain the information using the Class 2 Message Monitor feature. Does the scan tool communicate with the PCM? If yes, go to next step. If no, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  4. Select the Powertrain Control Module display DTCs function on the scan tool. Does the scan tool display any DTCs? If yes, go to next step. If no, see COOLING SYSTEM TROUBLE SHOOTING under ENGINE MECHANICAL in TROUBLE SHOOTING - BASIC PROCEDURES article in GENERAL INFORMATION.
  5. Does the scan tool display DTCs which begin with a "U"? If yes, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT for diagnosis. If no, go to next step.
  6. See DIAGNOSTIC TROUBLE CODE DEFINITIONSĀ .
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:

  • ā€¢ You smell fuel, burning insulation, or see smoke.
  • ā€¢ Brakes feel soft, pull hard to one side, or make grinding noises.
  • ā€¢ The engine overheats, stalls repeatedly, or misfires under load.
  • ā€¢ You are missing required tools, torque specs, or safe lifting equipment.
  • ā€¢ You are not confident in the next step or safety outcome.