On-Board Diagnostic (OBD) System Improvements - Service Engine Soon Light On, DTC P0014, P0116 or P1683 Set, Delayed Transmission Downshift and/or Excessive Fan Noise, ID # YT04032 (Reprogram PCM)

This bulletin is being revised to add an ID # to the Subject line and to change the labor code in the Warranty Information. Please discard Corporate Bulletin Number 01-06-04-052A (Section 06-Engine/Propulsion System).

Built Prior to the following VIN Breakpoints:

Some customers may comment on the Service Engine Soon lamp being illuminated, a delayed transmission downshift and/or excessive fan noise. Upon investigation, the technician may find either a DTC P0014 (Cam Phaser Performance), DTC P0116 (High Sided Coolant Rationality) and/or DTC P1683 (Low Power Counter Failure).

Reprogram the powertrain control module (PCM) on all affected vehicles, as identified above, including vehicles in new dealer inventory, used inventory, and any that return for service in or out of warranty.

Using a Tech 2 scan tool and TIS 2000, verify that the calibration programmed into the vehicle’s PCM has been programmed since August, 2001 or later. The GM Vehicle Inquiry System (GM VIS) may also be checked to see if the vehicle has been programmed since August, 2001. If the August, 2001 or later updated calibration has not been installed, reprogram the PCM with the latest updated calibration from TIS 2000 version 8.5 for 2001 data update or later.

*This is a unique labor operation number for use only with this bulletin. This number will not be published in the Labor Time Guide.