98 GMC sonoma

1998 GMC SONOMA
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TNOZARTASH
  • MEMBER
  • 1 POST
how do you reset the security code for a 98 GMC Sonoma?

Also, What could cause the security code to go on?
Jan 7, 2011 at 10:14 PM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Try the relearn procedure. Turn key on, turn key off, then turn key to crank position, no start, leave key on, watch security lite on or flashing. Wait till lite stops flashing, may take ten minutes. Turn key off for 10 seconds, go through procedure twice more for a total of 30 minutes. The relearn should be completed. If that doesn't work, check for applicable trouble codes, see if anything shows up?
Mar 22, 2011 at 12:56 PM
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