Automatic Transmission Diagnosis
WARNING: This page is about a different car, the 2015 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Many transmission faults will set one or more DTCs in the PCM/ TCM. In some instances a group of DTCs may indicate a particular fault. The transmission may only operate in default or failsafe modes while certain DTCs are set.
Begin diagnosis by performing the PCM Quick Test. Refer to ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID) . Record all DTCs and related freeze frame data. Clear DTCs after recording the information.