Mario Gauthier

Hi! My 2008 Sylverado 2500HD Diesel sometimes stay jammed on park It happenned a couple of times in the last months. Even if I step on the brakes like hell... This problem comes and go... and I always managed to force it in gear risking breaking the column. I Just learned about the neutral test to check if it's it was a bad light switch or the interlock solenoid but here is the thing: MY GMC DEALER tells me that my intermittent trailer braking problem is possibly related to my parking problem. And promest me a bill for 4 to 5 hours. I'M not a mechanic but I find it strange... Is this bul***t?