Automatic Transmission Gear Indicator Problems of GMC Acadia

The contact owns a 2019 GMC Acadia. The contact stated that while turning off the vehicle, the shift-to-park message was displayed. There was an abnormal beeping sound heard. The contact restarted the vehicle and moved forward or reverse. The vehicle failed to shift into park. The contact continued to shift the gear shifter. The contact stated that the engine revved. The vehicle was towed to the local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was contacted. The failure mileage was approximately 32,000.

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2018 Acadia will display “shift to park” warning along with an audible warning when the vehicle is shut off. This happens even though the prndl display is in the “park” position each time. If I try to exit the vehicle, the audible warning continues (apparently indefinitely). This began at an odometer of about 59,200. Initially, the situation could be corrected by restarting the car and shifting in and out of park or depressing the shift knob several times. Within a couple of hundred miles, it became consistent and eventually could not be corrected as described above. Unfortunately, this is not covered under warranty. I began driving for a few months without the shift knob, simply depressing the plunger on the shift rod coming up from the transmission. Doing this, the warning rarely occurs and, if it does, it’s easily corrected with one or two presses of the plunger. Some modifications of the shift knob have allowed the knob to be used with results similar to driving without the knob. I hope there will be a software update (deployed over onstar) to use the prndl information and eliminate this failed system.

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