Erratic Pointer Movement (Bad PCI Bus Message From PCM)

Using scan tool, check Powertrain Control Module (PCM) for DTCs. See SELF-DIAGNOSTICS - CARAVAN, TOWN & COUNTRY, & VOYAGER article in ENGINE PERFORMANCE. If any PCM DTCs are present, repair as necessary. If no PCM DTCs are present, perform coolant temperature sensor testing procedure. See SYSTEM & COMPONENT TESTING - CARAVAN, TOWN & COUNTRY, & VOYAGER article in ENGINE PERFORMANCE.