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The gear doesn't work (P,R,N,D,3,L) all of them are lit up vs only one and after resetting the computer (disconnect the battery for a few mins) everything works as normal but the first thing that cuts out is the gears, then after a couple days the entire cluster dies ( all gauges read 0 and no bus is seen as mileage) all the while the car runs like nothing is wrong. The codes I get are random but P 1698 is almost always there which points to the TCM. BUT as I drive, sometimes my interior lights come on randomly and shut off shortly, which points to the BCM.
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All of the lights being lit up at once could be the range switch or you have a bad connection some where. Normally when you see no bus on the cluster you are loosing a signal from a module. Have to check power and ground to the different modules. Make sure the plug at the back of the cluster is tight. Interior lights could be a bad wire in the door harness from opening and shutting it so many times. These are just some things to start with