Having problems with your 2001 GMC Yukon Denali ?
2001 Yukon Denali: The security light came on my 1999 Yukon Denali ye...
\015 The security light came on my 1999 Yukon Denali yesterday while driving what caused this?\015
The security system (Passlock) is having problems, it's typical on those trucks. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.
Repair Help & Product Troubleshooting for 2001 GMC Yukon Denali
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.