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HOMESERVICE MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 17 (ENGINE CONTROLS - TESTS W/CODES - 5.7L (G SERIES))DIAGNOSTIC TROUBLE CODESDTC P0141 - HO2S HEATER CIRCUIT BANK 1, SENSOR 2DIAGNOSTIC PROCEDURES
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F

Diagnostic Procedures

1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Diagnostic Procedures
WARNING: This page is about a different variant/trim than selected.
  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the F - BASIC TESTING - 5.7L article. After performing OBD system check, go to next step.
  2. Install scan tool. Turn ignition on, with engine off. Monitor HO2S voltage using scan tool. If HO2S voltage gradually decreases by .15 volt, go to step 5). If HO2S voltage does not gradually decrease by .15 volt, go to next step.
  3. Turn ignition off. Disconnect HO2S connector. Using test light, probe HO2S connector terminal "D" (engine harness side) to ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 6).
  4. Connect test light between terminals "C" and "D" of HO2S connector (engine harness side). If test light illuminates, go to step 7). If test light does not illuminate, go to step 8).
  5. DTC is intermittent. If no additional DTCs are set, see DIAGNOSTIC AIDS. If any additional DTCs are set, go to applicable DTC test.
  6. Check for open in 20-amp ENG-1 fuse. If fuse is open, go to step 14). If fuse is not open, go to step 9).
  7. Check for poor connection at HO2S. If a problem was found, go to step 12). If a problem was not found, go to step 15).
  8. Check for poor connection at HO2S. If a problem was found, go to step 12). If a problem was not found, go to step 10).
  9. Check for poor connection at HO2S. If a problem was found, go to step 12). If a problem was not found, go to step 11).
  10. Repair open in HO2S heater ground circuit. After repairs, go to step 16).
  11. Check for open in HO2S ignition feed circuit. If circuit is open, go to step 13).
  12. Repair poor connection. After repairs, go to step 16).
  13. Repair open in HO2S ignition feed circuit. After repairs, go to step 16).
  14. Repair short to ground in HO2S ignition feed circuit and replace fuse. After repairs, go to step 16).
  15. Replace HO2S. After replacing sensor, go to next step.
  16. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0141. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
  17. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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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.