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Mastertech 1
Mastertech 1, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2261
Experience:  ASE Master technician with over 30 years of experience, including GM.
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2008 Chevy Trailblazer with the 5.3l v8. locks will unlock

Customer Question

2008 Chevy Trailblazer with the 5.3l v8. locks will unlock and lock and the shift indicator will shift from (D) drive to (P) park while driving. no check engine lights just got back from dealer replaced a steering wheel sensor. truck has a hesitation when you go to pass someone. but they never fixed the door lock problem or hesitation problem
Submitted: 1 year ago.
Category: Chevy
Expert:  Mastertech 1 replied 1 year ago.

So the vehicle was doing the shift indicator movement before you took it in to the Dealer, Correct? Thanks, ***** *****

Customer: replied 1 year ago.
that's why it was taken into dealer and still doing it and has hesitation when passing someone. Didn't fix anything but replace steering wheel module. 500 bucks still nothing
Expert:  Mastertech 1 replied 1 year ago.

OK, The issue you are having is related to the Transmission gear range switch (this is an electronic switch/sensor that sees what gear you manually shift the transmission into) it sends a signal to the computer, then inturn it lights up the proper gear posistion on the shift indicator (p r n d) and when it sees that you are in drive range it also locks doors when your speed hits the preferred setting. When this switch/sensor gets a glitch in it it will cause the indicator to move from like drive to park, or? When the computer then sees the bad reading from the sensor it also unlocks the doors (it thinks you are going to exit the vehicle! They need to take agood look at the sensor and also check the wiring connections to it, Thanks,Please let me know if I can be of any other assistance to you with this issue!

Customer: replied 1 year ago.
Is there a correct name for that part?
Expert:  Mastertech 1 replied 1 year ago.

They also at some parts stores call it a neutral saftey switch. Thanks