Why is speedometer inoperative on 1999 Dodge pickup with abs and brake light on?

The inoperative speedometer on a 1999 Dodge pickup, along with the ABS and brake light being on, may indicate a malfunctioning vehicle speed sensor (VSS) or issues with the ABS system. The VSS provides speed data to the speedometer and the ABS module; if it fails, it can cause both the speedometer and ABS warning lights to activate. Additionally, problems with the ABS module or wiring can also lead to these symptoms. It's advisable to perform a diagnostic scan to pinpoint the exact issue.