The code specifically indicates that a module—often the Transmission Control Module (TCM) —does not match the vehicle's stored configuration (Proxi data). This is a common "hot" topic for Fiat owners because it frequently occurs after a simple battery replacement or a series of jump-starts. Common Symptoms & Causes
If your Fiat is throwing a P150000 code alongside high temperature readings, the culprit is likely one of the following: fiat p150000 hot