Service Vehicle Soon

WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

The IPC illuminates the SERVICE VEHICLE SOON indicator in the following conditions:

The PCM detects certain malfunctions that are not related to the emissions system. The body control module (BCM) sends a message requesting illumination to the IPC via the serial peripheral interface (SPI). The BCM receives a class 2 message requesting illumination from the PCM.
The BCM detects a loss of SPI data from the IPC.