How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 29427
Experience:  GM Grand Master Technician 2007. 14 years experience.
10949255
Type Your GM Question Here...
GM Tech (Cam) is online now
A new question is answered every 9 seconds

GMC Sierra 1500 HD SLE how do i reset thw security system

Resolved Question:

how do i reset thw security system on a 1999 gmc sierra z71?
Submitted: 5 years ago.
Category: GM
Expert:  GM Tech (Cam) replied 5 years ago.

Welcome, and thanks for using Just Answer. I am Cam, and I will do my best to assist you. When you are finished please click on accept only if you are satisfied. I don't get paid unless you do.Please do not accept if you cannot leave positive feedback. I don't know if you are a tech or a just working on your own vehicle so we may have to fine tune the answer. I only know as much about your problem as you have told me in your post, so my answers will be based on what you tell me so please add all the details you can. About your vehicle,

Turn the key on, with the engine OFF.Try to start the engine, then release the key to ON, Engine will not start. Watch the security telltale, after about 10 mins, it will turn OFF.

Turn OFF the ignition, and wait 5 seconds.

Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes. You must turn the ignition OFF before attempting to start the vehicle.

 

Start the engine .

GM Tech (Cam) and 2 other GM Specialists are ready to help you
Customer: replied 5 years ago.
what caused this problem? and does security system cut power to fuel pump? what can i do so this doesnt happen again?
Expert:  GM Tech (Cam) replied 5 years ago.
Security only cuts the injectors. Did the relearn work?