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Automatic Transmission Diagnosis

WARNING: This page is about a different car, the 2021 Ford Police Interceptor Utility. However, it is still accessible from the selected car via links, so may be relevant.

Many transmission faults will set one or more diagnostic trouble codes (DTCs) in the PCM/ TCM. In some instances a group of diagnostic trouble codes (DTCs) may indicate a particular fault. The transmission may only operate in default or failsafe modes while certain diagnostic trouble codes (DTCs) are set.

Begin diagnosis by carrying out the PCM self-tests:

  1. KOEO and CMDTC
  2. KOER and CMDTC

For vehicles equipped with a TCM, carry out the TCM self-test.

Record all diagnostic trouble codes (DTCs) and related freeze frame data. Clear the diagnostic trouble codes (DTCs) after recording the information.

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