Circuit Description
WARNING: This page is about a different car, the 2005 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
The transmission control module (TCM) provides the engine control module (ECM) vehicle speed through high-speed communications on the controller area network (CAN). Vehicle speed is produced by the AC current generated through the transmission output speed sensor (OSS) as the output shaft rotates. The ECM continuously monitors the vehicle speed signal supplied by the TCM.
When the ECM detects very low vehicle speed, while the vehicle is in motion, DTC P0500 sets. DTC P0500 is a type B DTC.