The Ancel BD310, the Gear Team's Best Overall choice for home OBD-II scanners, offers versatility with both corded and Bluetooth capabilities.. In Bluetooth mode, its free app is simple to ...

If your GM car/truck is a '96-and-later, it incorporates an OBD-II-based PCM, which controls the transmission as well. For engine control, the PCM takes many sensor inputs (O2, TPS, RPM, MAF, MAP ...