Two problems related to anti-theft controller have been reported for the 2005 Chevrolet Trailblazer. The most recently reported issues are listed below.
Vehicle would not start. Had it towed to mechanic shop. Battery was completely dead, though the battery was only 1 year old and was a very expensive ac delco 6 yr battery. Mechanic changed the alternator and the battery and everything tested the same. Put old battery and alternator back in, as battery he charged was holding the charge ok. Could not locate source of problem. The next day, the dash lights were not working, nor the interior lights. As I drove along the highway, the dashlights blinked and then stayed on. Ceiling light works intermittently. The alternator shows that it is charging very hard. According to other incidents reported on the internet, there is an electrical problem in the 2005 Trailblazer that may or may not be associated with the passlock anti-theft system, but in any case, shows slow leak of electrical current that slowly drains the battery 24/7, until the battery is dead. Why is no recall issued making general motors responsible to find and fix this problem without cost to the owners of 2005 Trailblazers. I spent $130. 00 at the mechanic shop and they could not find what the problem is, much less fix it. My vehicle is parked in a garage most of the time, and there is no reason for this malfunction other than faulty gm part somewhere. Our local chevy dealer told me they think the problem is related to the passlock anti-theft system but they have never been able to nail it down. They reference a vehicle which they kept for two weeks for diagnosis of a "won't start" complaint, and the vehicle started some days and not other days with no pattern to the malfunction.
I have had the following problems with my 2005 chevy trailblaxer ext LS: 2008: fuel sensor failure, running board fell off 2009: head and tail lights going out frequently, windows would get stuck- could not go up or down- all dash lights flashing, car stalling out- needed circuit board replaced. Anti-theft non-functioning. 2010:windshield wipers will not shut off(replaced display board), idle pulley needs to be replaced , 4x4 running rough and making a sound,spedometer non-functioning, radio stopped working,glove box lock broke, heat/ac stopped working first on blowers 4& 5 then stopped completely I have not been able to afford to fix all these repairs, as it exceeds $2,000. Car is over warranty and was brought used from a former gm dealer at under 50k. I contacted gm in November 2010 and they stated that they my vehicle was out of warranty and they could not assist me. Gm initiated contact in December of 2010 and told me to get a full diagnosis of the problems and stated that it was ok to go to the former gm dealer. I paid over $100 for this diagnosis and they stated that my vehicle was out of warranty and they cannot provide any assistance whatsoever.