The TCM can request activation of the MIL lamp Via a communication line to the ECM. This is only a request from TCM to ECM to turn the MIL on. The fault code is stored in the TCM. Select Transaxle system on the Scantool and monitor DTC related automatic transaxle system. DO ALL REPAIRS associated malfunction with A/T.
Basically, you need to check the TCM for codes. The code is just telling the check engine light to come on so you know there is a problem.
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