ignition switch use to turn on now it wont


Asked by Apr 01, 2014 at 05:28 PM about the 2004 Chevrolet TrailBlazer LS 4WD

Question type: Maintenance & Repair

stick the key in  the ignition  wont turn  forward or backward  and it did prior replaceimg

14 Answers

Mark Grignon

2004 Chevy Blazer has a "Passlock" security system. The keys are not chipped, so I don't believe the battery replacement would be the cause. Is the "Security" light lit on the instrument cluster?

5 out of 5 people think this is helpful.
Mark Grignon

I believe your issue is the ignition switch itself. Blazers are notorious for ignition switch failure. There may be a tumbler getting hung up inside the ignition cylinder. Your key may be worn. Do you have a better cut key? Spare key?

2 out of 2 people think this is helpful.

thank you i had to bypass that awhile back i bought a battery from AAA club wasnt the best fit for my beautufull beast the radio played and lights worked she sat all winter sent that battery back and purchased i a optima red top the ignition key wouldn't turn now could it be i didn't put battery terminals tight the whole way or other if that needs replaced it was tampered with wouldnt you think please respond and thank you

Mark Grignon

I have to stress that the Passlock system will not stop the ignition switch from turning. The Passlock security system is enabled (via wrong key, or simply no key) the vehicle will turn over, but not start. So if you cannot turn your ignition switch as I understand (front or back), the problem lies within your ignition switch or you're trying to use a severely worn key that is not engaging the tumblers.

2 out of 2 people think this is helpful.

thank you its weird how it would go bad just sitting. key aint worn

1 out of 1 people think this is helpful.
Mark Grignon

Last ditch effort... Try spraying lubricant into the ignition cylinder and ramming the key in and out. Try jogging the steering wheel back and forth. Jog the shifter, press the brake.. Anything to try and get the ignition to turn. Good luck!

3 out of 3 people think this is helpful.

i will try that... did... most that but the lube ing,,, thank you much will let you know im stopping for now looks like its going to rain storm

2 out of 2 people think this is helpful.

Hi I have a 05 trailblazer that wont start in Minnesota. . It has power but no sound at the ignition (ie) clicking or anything .. acts like she is dead.. but has a good battery and the blower motor sounds strong and has lights...

21 out of 21 people think this is helpful.

he is right no CHIP but the key has a small cut at the end slanted on each side to activate a contact.. you have to file the end of the key if the key turns but states security service..then match the key with a dealer and have it cut right..

2 out of 2 people think this is helpful.

abs and brake light are on cant turn the key off the key is stuck on and running

5 out of 5 people think this is helpful.

I HAVEa problem my will turn backwards but would not turn forward to start the car

1 out of 1 people think this is helpful.

My nephew has a 2001 chevy trail blazer. it would not start after he put the key in ignition but it turned back & forth with ease. Too loose. Does anyone think the tumbler shld b replaced?? Tx


I have changed everything in my 03 trailblazer on why it would start then wouldn't drove it for 7 weeks an did it again now just had a new key made by GM cause the keys did not match up plus old one looked very worn out make sure the key says GM on it


i have a 2006 trailblazer it will start and run but will die for no reson let it set for about 30 sec to 1 min and will start and go again but will do the same thing again repeat and start and go again but everything work just wont start till you let it set for 30 sec to a min what is wrong and what do i do to fix this. thank you billy

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