IT IS LETTING YOU KNOW THAT YOU HAVE A TROUBLE CODE IN THE TCM (TRAN CONTROL MODULE) COMPUTER MOST OF THE TIME IF ITS FLASHING,IT WILL EITHER NOT SHIFT INTO OVERDRIVE,OR SHIFT WEIRD,USUALLY IT WILL GIVE YOU REASON TO CHECK THE TRANS, IT COULD BE A SIMPLE AS THE O/D SWITCH IS BAD, & IT IS TELLING YOU THAT O/D CANNOT BE TURNED OFF.
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