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2014 Impala Electrical Issues

Speedometer, tach, fuel,& temp gauges in/op, heat/a.c. In/op, tpms, airbag, abs, & traction control lights on, radio intermittently shuts off, car will not start without the fob placed in the compartment inside the center armrest & starting/shutting off has a delay. First issue was about a year ago, blind spot detection stopped working, light stayed on in the mirror - drivers side first then passenger, both quit working completely & message displayed on dash, clear message & everything worked as normal expect side detection. Started having the issues listed above a couple of days ago, started going through the wire harness checking connections & grounds, found corrosion inside the connection plugs to the side detection modules. Disconnect modules on both sides & everything went back to working normally, just a message displayed for side detection & front camera which are not hard codes so remote start still works. Modules will have to be replaced & corrosion cleaned, but car works normally again. Access to the modules & disconnecting them is pretty easy, i removed the rear tires & removed four mounting screws on each side of the back of the wheel well insert, takes a small torx bit, pull wheel well insert back & you will find the modules mounted about 16" back on the inside of the rear bumper. Disconnect the plug & look for corrosion. Tape up plugs if not replacing modules right away & start the car, all issues should be gone immediately. Good luck.
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