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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (ENGINE CONTROLS SELF-DIAGNOSTICS - 6.5L)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.
NOTE: Check for applicable Technical Service Bulletins (TSBs) before proceeding. DO NOT perform the following procedure if driveability conditions are not present. DO NOT turn ignition off during the following procedure or clear DTCs unless instructed to do so.
  1. If engine does not crank, see appropriate STARTERS article in STARTING & CHARGING SYSTEMS. Ensure battery is fully charged and cables are clean and tight. Ensure PCM grounds are clean, tight, and in proper location. See WIRING DIAGRAMS article. Repair as necessary. After repairs, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, attempt to establish communication with PCM. If scan tool communicates with PCM, go to next step. If scan tool does not communicate with PCM, perform SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article.
  3. Attempt to start engine. If engine starts and idles, go to next step. If engine does not start, go to appropriate NO START diagnosis in BASIC DIAGNOSTIC PROCEDURES article.
  4. Using scan tool, select DTC display function for PCM, VTD, IP Cluster and EBCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, go to step  9.
  5. Using scan tool, save or capture powertrain DTC information or store information. After saving DTC information, go to next step.
  6. If scan tool displays DTCs which begin with a "U", go to appropriate BODY CONTROL MODULES article. If no "U" series DTC are displayed, go to next step.
  7. If DTC P0601or P0602 is set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTC P0601 or P0602 is not set, go to next step.
  8. If scan tool displays DTC P0560 or P0620 diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTC P0560 or P0620 is not set, go to next step.
  9. If customer's concern is related to an automatic transmission problem, diagnose transmission. If customer's concern is not related to the automatic transmission, go to next step.
  10. If customer's concern is with I/M testing, verify if vehicle meets the criteria that complies with local area requirements. Repair as necessary. If customer's concern is other than I/M testing, go to next step.
  11. Check for cause of hard start, surges/chuggles, lack of power, sluggishness, or sponginess. Check for cause of detonation/spark knock, hesitation, sag, stumble, cuts out/misses, poor fuel economy, poor fuel fill quality, rough, unstable, or incorrect idle and stalling. Check for cause of dieseling/run-on, backfire, MIL inoperative, or MIL is always on. Repair as necessary. If no problem is found, problem is intermittent.
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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.