PRND321 Display
WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) displays the selected gear position as determined by the transmission control module (TCM). The IPC receives a serial data message from the TCM indicating the gear position. The PRND321 display blanks if:
- The TCM detects a malfunction in the transmission range switch circuit.
- The IPC detects a loss of serial data communications with the TCM.