Im pretty sure my nsbu switch is going out. But tell me what you think. Ive noticed that Sometimes when i start my truck the gear selector light is real dim then when the truck warms it starts to get brighter. Last night I was parked and shut the truck off and then turned it back on and the light was out. Then it came on and i went to got put it in reverse and wouldent go. The service engine light came on. This morning i started my truck and it was fine then the light went off and came back on. Im pretty sure it is the nsbu switch. I just want to get ur guys opinion. Thanks