GM Passlock
If your Hummer H3 refuses to start or has difficulties it very well may be your Passlock that is failing.
Typically you will see a red lock flashing in your drivers display unit nearest the side you put your car key in. (There's a novelty Lol!)
Even so, the information for this is listed below;
(This information is for just the module)
01A1N216
855610-1302
)PA66-GF33(
26124826
(This information is for the entire replacement unit)
D1403G
15795322