Service Engine Soon Lamp On with DTCs P0141/P0161 (Reprogram VCM)
| Subject: | Service Engine Soon Lamp On with DTCs P0141 and/or P0161 (Reprogram VCM) |
| Models: | 2000 Chevrolet and GMC C/K Models (Silverado and Sierra) |
| with 4.8 L or 5.3 L V8 Engine (VINs V, T -- RPOs LR4, LM7) |
| Built prior to the following VIN breakpoints: |
Assembly Plant | Division | VIN Breakpoints |
|---|---|---|
Oshawa | Chevrolet | 2GCEC19V8Y1226868 |
Oshawa | GMC | 2GTEK19T9Y1226878 |
Condition
Some customers may comment about the Service Engine Soon lamp being illuminated with no other driveability concerns noticed. When investigating, the technician may find one or both of the following stored codes.
| • | DTC P0141 (HO2S Heater Circuit Bank1 Sensor2) |
| • | DTC P0161 (HO2S Heater Circuit Bank2 Sensor2) |
Cause
The engine diagnostic was not robust enough to account for variability in HO2S heater warm up time. Vehicle emissions are not affected by this condition.
Correction
Verify that the DTC is not the result of an inoperative component, or a related wiring/other condition. Reference the Service Manual diagnostics as needed. If no other conditions are found, the following service calibrations have been released to address this issue. Re-program the VCM with the appropriate calibration listed below.
Old Cal P/N | New Cal P/N | Assy Plant RPO | Vehicle | Engine RPO | Transmission RPO | Fuel/Emissions |
|---|---|---|---|---|---|---|
9358009 | 9358082 | OSG | 1/2 Ton 2WD and 4WD | LR4 4.8 L | Automatic M30 | NF2-NN8/NW7 (Federal Tier 1, Canada) |
9358012 | 9358083 | OSG | 1/2 Ton 2WD and 4WD | LR4 4.8 L | Automatic M30 | NN8 (Non-European Unleaded Fuel Export) |
9358015 | 9358084 | OSG | 1/2 Ton 2WD and 4WD | LR4 4.8 L | Automatic M30 | NC1 (California LEV) |
9358040 | 9358085 | OSG | 1/2 Ton 2WD and 4WD | LR4 4.8 L | Manual MG5 | NB6/NF2-NN8 (Nationwide and Canada) |
9358042 | 9358086 | OSG | 1/2 Ton 2WD and 4WD | LR4 4.8 L | Manual MG5 | NN8 (Non-European Unleaded Fuel Export) |
9358018 | 9358087 | OSG | 1/2 Ton 4WD | LM7 5.3 L | Automatic M30 | NF2 Federal Tier 1 |
9358022 | 9358088 | OSG | 1/2 and 3/4 Ton 2WD 1/2 Ton 4WD | LM7 5.3 L | Automatic M30 | NN8 (Non-European Unleaded Fuel Export) |
9358025 | 9358089 | OSG | 1/2 and 3/4 Ton 2WD 1/2 Ton 4WD | LM7 5.3 L | Automatic M30 | NC1 (California LEV) |
The calibrations listed are electronic calibrations and are NOT available from GMSPO. Calibrations will be available from Techline starting December 1999, on the TIS 2000 Disk 26 CD ROM.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J6355 | PROM, Reprogramming Add - Diagnosis Time | Use PublishedLabor Time |
