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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 811 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC SYSTEM CHECK - CRUISE CONTROLTEST DESCRIPTION
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Test Description

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Test Description
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Lack of communication may be due to a malfunction in the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 4:  The presence of DTCs which begin with "U" indicates that some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
Diagnostic System Check - Cruise Control

Step Action Yes No
1 Install a scan tool.
Does the scan tool power up?		 Go to Step 2  Go to Scan Tool Does Not Power Up in Data Link Communications
2 
  1. Turn the ignition ON, with the engine OFF.
  2. Attempt to establish communication with the following modules:
    • Powertrain Control Module (PCM)
    • Electronic Brake Control Module (EBCM)
Does the scan tool communicate with the modules listed above?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Class 2 Device and to Scan Tool Does Not Communicate with Keyword Data Line in Data Link Communications
3 Select the DTCs function on the scan tool for the following modules:
  • Powertrain Control Module (PCM)
  • Electronic Brake Control Module (EBCM)

Does the scan tool display any DTCs?		 Go to Step 4  Go to Symptoms - Cruise Control 
4  Does the scan tool display any DTCs which begin with a "U"? Go to Diagnostic Trouble Code (DTC) List in Data Link Communications Go to Step 5 
5 Does the scan tool display DTC P560, P0562, P0563, P621, P2500, or P2501? Go to Diagnostic Trouble Code (DTC) List in Engine Electrical Go to Diagnostic Trouble Code (DTC) List 
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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.