Question about 2009 Chevrolet Silverado 2500HD

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Doors lock and unlock while driving and it shows on dash to be shifting from drive to park again and again. then it goes to low power,shows "service ABS system, and service stabilitrac." I took the truck to the dealer and there are no codes??????HELP

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The locks are cycling because it thinks it is going into park there is a problem with the park nuetral switch it is on the side of transmission where shifter hooks on make sure wiring is not rubbing and cut into harness

Posted on Mar 28, 2011

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Some factory and aftermarket alarms lock the doors as you shift out of Park, or the car goes faster than 7-10 MPH, and unlock when shift to Park, or turn off ignition. If you have the option to cancel this option and lock the doors manually, then you know the signal input wire(s) have loose connection and are the culprits.

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What would cause the doors to randomly lock constant and set security


This is related to communication with the transmission shift "range selector". It is a loose connection that is causing the control module to "see" a park or Neutral and the doors unlock. This may turn on the check engine light also. It may eventuallly cause the transmission to not shift, also. You need to check the connection on the transmission and on the shift range selector (sometimes called the "PRNDL" switch. The computer automatically locks the doors when you select a gear. It is seeing no gear selected and unlocking the doors, the seeing a gear selected again, and locking the doors. You really need to get this repaired soon.

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The indicator for park/neutral is changing on the dash without you moving the shifter?
If so...the park/neutral switch on the transmission...(or could be on shifter housing) is informing the lock control module/body module... that the vehicle has been put in park...thus the door unlock actuation...then..apparently the switch is erroneously informing the lock module that it is in neutral...drive...thus locking the doors....could also be a fault in the general body module...which ..most likely...controls most of the body systems via CAN BUS....Controller Area Network system....
Odd that no codes are in the body/lock module....make sure your scan tool is indeed able to access the body control systems...if not...you need to find a location that will provide that service.

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While im driving it will start locking and unlocking itself rapidly and now whenever i get out and lock it, it will just unlock again and wont stay locked. please help


It might be the Shifter Lock - Unlock switch. Use the following to check:
Look under the dash, on the brake pedal arm. There are one or two switches that activate brake lights and/or shift unlock. Check for loose mounting nut or a missing rubber nubber. Is the brake pedal coming all the way back up? Look on the floor for something not usually found there. These switches are adjustable and it may be as simple as adjusting them. Have a helper look for brake lights on and shift lever unlocked while you push and release the switches with your finger. Depress the brake pedal to get it out of the way. Remember to set the park brake first. Could just be a bad switch or loose connector. Check fuses and the bulbs. Is shifter fully in Park? Also try jiggling the turn signal lever.
Make sure the return spring on brake pedal works properly holding pedal up firmly. It could be "jiggling" while you drive.

Aug 24, 2011 | 2008 Pontiac G6

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Hi, I have a 2007 Accord. When I shift into Drive, my buttons autolocks. How to I get them to UNlock when I shift into Park or shut the engine ?


Typically on autolock cars, when you pull the door handle to open it opens without having to unlock it. The auto lock is a safety feature. Some cars will auto-unlock when you stop, but most wont, you have to hit the unlock button. If yours doesn't auto unlock, the only way to change it would to be to install a switch somewhere on the shift mechanism, it would take a while to do.

Feb 18, 2010 | 2007 Honda Accord Sedan

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