Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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This sounds like a fault with the transmission position sensor.If this sensor is sending an incorrect signal on what position it is in this will cause the locks to cycle like this here as well as the noise in the shifter and incorrect shifting which can cause the transmission to barely engage properly to operate the vehicle or engage an incorrect gear position electronically.
This position sensor/switch is located on top of the transmission where the shifter cable connects.The cable is removed and then the sensor/switch can be replaced.I would have this tested to make sure this is the cause here but this does sound like the fault for this issue.Below is a picture of the sensor.
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Was this sensor/switch replaced and it the shift indicator showing the correct gear that the shifter is in?