The P0720 code is activated when the PCM detects insufficient or erratic input from the output shaft sensor (OSS). So, if you’re getting the code P0720, this article will help point you in the right direction. However, having the DTCs won’t make a difference if you don’t know what they mean.
Thus, you may have an ECM and a TCM but the ECM may display DTCs that are TCM related – like this one. Thus, we refer to the ECM/PCM in these articles when discussing the primary on-board computer, but a growing number of vehicles tends to have separate Engine and Transmission Control modules that communicate with each other over the CAN bus. The ECM is a module that controls only the engine, and on vehicles with automatic transmissions there will be a Transmission Control Module (TCM) that communicates with the ECM.Ī PCM (Powertrain Control Module) controls both the engine and the transmission.
700 series codes such as the P0720 are typically transmission-related codes stored by the ECM or PCM.
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