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Automatic Transmission Diagnosis

WARNING: This page is about a different car, the 2024 Ford Transit-350 HD, 2024 Ford Transit-350, 2024 Ford Transit-250, and 2024 Ford Transit-150. 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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