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Automatic Transmission Diagnosis

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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 (Diesel) or ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID) . Record all DTCs and related freeze frame data. Clear DTCs after recording the information.