One problem related to ignition module has been reported for the 2004 Cadillac Escalade. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Cadillac Escalade based on all problems reported for the 2004 Escalade.
Passlock security system failure - vehicle tries to start then stops firing. Passlock light comes on and cannot start vehicle for 10 - 20 minutes. This has occurred 7 times in 15 months beginning at 55k miles. I have read several complaints from owners having the same problem. Dealer repairs are not permanent. These repairs range from replacing ignition cylinders to security modules.