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Automatic Transmission Diagnosis

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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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