Automatic Transmission

The DTCs are grouped into several types. Each type has a unique set of characteristics for STL or MIL operation, DTC storage, and DTC clearing. The following list contains a brief summary of the types and the associated properties of each:
^ Type A is emissions related. The MIL illuminates, the DTC stores on the first fail and the Freeze Frame data is captured.
^ Type B is emissions related. If the fault is active for 2 consecutive driving cycles (misfire and fuel trim DTCs differ slightly), the MIL illuminates, the DTC is stored and the Freeze Frame data is captured at the time of the second fail. At the time of the first fail, the MIL does not illuminate and no Freeze Frame data records. The DTC will appear in memory as pending. If the next trip reports a pass, the DTC is gone.
^ Type C is non-emissions related and does not turn on the MIL, but may turn on an auxiliary service lamp if the vehicle is so equipped. The DTC stores at the time of the first fail.
^ Type D is non-emissions related, does not turn on any lamp. The DTC stores at the time of the first fail.

The TCM DTC Type Table contains all of the Transmission DTCs and their type. DTCs in bold print may also set in the ECM. Refer to Powertrain Management for engine system diagnosis and information.