I could not unlock the theftlock feature on my 1997 Pontiac Transport Van , I had called my dealer where I bought the van(with 500 miles on it) so I had not entered the unlock codes into the radio, they were already entered into the radio. The dealer wanted to help me out by charging $100.00 to unlock the radio(thanks for buying your van from us). So I went on line and found the web site DelcoLockCodes.com and bought the unlock codes for $6.99 , paid with PayPal and had the codes arrive to my E-mail address within 5 min. Thank you for saving me $94.00 today