Engine Oil Temperature Gauge Warning Lamp Illuminated (Call TCSC and Reprogram IPC Module)

This bulletin is being revised to add an Important statement to the Correction section and TIS2WEB programming steps. Please discard Corporate Bulletin Number 04-08-49-017A (Section 08 -- Body and Accessories).

Some customers may comment that during or after aggressive driving, the engine oil temperature display in the DIC has a higher than expected reading or the engine oil temperature warning has come on.

A ground offset between the engine oil temperature sensor and the instrument cluster affects the temperature reading and may indicate a temperature higher than actual. The actual oil temperature should be in operating range.

Important: This vehicle can only be programmed using TIS2WEB. Before reprogramming, it is necessary to slow the baud rate in the TIS2WEB terminal. Failure to slow the baud rate could result in locking up the IP. Contact Techline to obtain a VCI number in order to complete the programming.

Engineering has released a software update. Technicians are to use normal SPS reprogramming procedures to reprogram the IPC module with an updated software calibration. Prior to reprogramming, technicians MUST contact the Techline Customer Support Center (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French) to obtain a Vehicle Configuration Index (VCI) number and for assistance in modifying TIS2WEB pass-thru RS-232 Baud rate from 115200 to 57600.

The new calibration is available in TIS2WEB. Use the following procedure to reprogram through TIS2WEB.

1. Log into TIS on the web through Dealerworld (in Canada, GM infoNET).
2. Enter Service Programming System.
3. Click on the "Start SPS" button.
4. On the screen, click on the "settings" button in the lower left corner in order to select "Tech2 Legacy Pass-Thru" or "Tech2 Remote".
5. Click on the "Diagnostics" tab.
6. Change the Baud Rate to 57600.
7. Click OK.
8. Contact the TCSC at the number above to obtain a VCI number.
9. Proceed with SPS Pass-Thru programming to reprogram the IP.

Important: The IP Module may not be listed in the modules to choose from. If this happens, select any one of the modules listed in order to proceed to the next screen. On the next screen, choose "VCI Number" to proceed to the screen that will allow the VCI number to be entered.

10. After programming is complete, go back into the settings to change the Baud Rate back to 115200.

For vehicles repaired under warranty, use: