VCM - MIL ON/DTC P0141/P0161 Set

Bulletin No.:
00-06-04-006

File In Section:
06 - Engine/Propulsion System

Date:
February, 2000

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 4.8L or 5.3L 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 (H02S Heater Circuit Bank1 Sensor2)

^ DTC P0161 (H02S Heater Circuit Bank2 Sensor2)

Cause

The engine diagnostic was not robust enough to account for variability in H025 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 service calibrations have been released to address this issue. Re-program the VCM with the appropriate calibration listed.

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 Use
Add - Diagnosis Time Published
Labor Time