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99 Tahoe security light flashing and truck wont start help?

Tiny
JESS99TAHOE
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 166,000 MILES
This has happened before usually resets its self after like a half hour this time hasnt any ideas it obviously has to do with the stock theft system but what can I do to fix it?
Thursday, January 12th, 2012 AT 7:26 PM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Turn the key on until the security light goes out, this can take up to 10 minutes, then turn off and then try to start the car. This resets the esecurity system. That may be all it is.
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Thursday, January 12th, 2012 AT 7:43 PM
Tiny
JESS99TAHOE
  • MEMBER
  • 4 POSTS
K I let the light go out. Turned off then back on and the security light is flashing again and truck still wont start, any other ideas?
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Thursday, January 12th, 2012 AT 8:55 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You'll hav eto take to a dealer then to have th em put a tech 2000 on it to straighten it out. They may have to recode your key. If you have another key like one that came with it you might try the same thing and then look in your manual on how to recognize the new key you have.
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Thursday, January 12th, 2012 AT 8:58 PM
Tiny
JESS99TAHOE
  • MEMBER
  • 4 POSTS
I didnt changr the key. I dont think it is a chipped key. This problem has been intermitant since I bought the truck last year. Do you think it could be the ecm
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Thursday, January 12th, 2012 AT 9:06 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
No if its intermittent then it will be harder to find alot oftimes the dealer can straighten it out with updates and certain thigs you cant find on a regular scanner
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Thursday, January 12th, 2012 AT 9:08 PM
Tiny
JESS99TAHOE
  • MEMBER
  • 4 POSTS
Alright thanks for the info
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Thursday, January 12th, 2012 AT 9:13 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Our pleasure. Was the dealer able to recode the key or use a specific scanner to determine the cause?
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Friday, January 27th, 2012 AT 5:48 AM

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