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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29457
Experience:  GM Grand Master Technician 2007. 14 years experience.
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It won't turn over, 05 trailblazer lt, 05 trailblazer Lt, I

Customer Question

It won't turn over
JA: What is the model/year of your Chevy?
Customer: 05 trailblazer lt
JA: What year is your Chevy?
Customer: 05 trailblazer Lt
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: I think my anti theft system has locked my vehicle up yes I'm trying to fix it myself
JA: No. I'm the Chevy Mechanic's Assistant.
Customer: Can you help me
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 7 months ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 7 months ago.

Hi there, I am Cam.

So on your Trailblazer, do you get a flashing passlock or the lock through a vehicle symbol flashing all the time when you try to start?
If you have someone feeling the starter relay in the underhood fuse block when you do try to start, does that relay click?

Customer: replied 7 months ago.
Hold on we are trying starter relay now
Expert:  GM Tech (Cam) replied 7 months ago.

Ok.

Customer: replied 7 months ago.
the relay is clicking
Expert:  GM Tech (Cam) replied 7 months ago.

Ok so this rules out security. If the relay is clicking then your computer system is trying to operate the starter. That tells me this is most likely a burnt fuse, bad relay or a bad starter. Verify your fuses, swap the relay for another from the fuse block with the same numbers, and if that does not work, then your starter is likely bad. Myself I would try hitting the starter housing to jog the starter to work again. If that works then it only confirms a bad starter.

Customer: replied 7 months ago.
The relay the relay clicking is the fuse the fuel relay the relay not clicking is the starter relay
Expert:  GM Tech (Cam) replied 7 months ago.

Im not sure what you typed there. Can you rephrase that please.

Customer: replied 7 months ago.
The fuel relay is clicking but the starter relay is not clicking
Expert:  GM Tech (Cam) replied 7 months ago.

Ok, Does the dash show PARK?

Customer: replied 7 months ago.
Expert:  GM Tech (Cam) replied 7 months ago.

How about the lock through a car symbol or the word security, do either of those flash all the time on the dash?

Customer: replied 7 months ago.
No none of them are flashing none of them at all
Expert:  GM Tech (Cam) replied 7 months ago.

Ok and the check engine light is on?

Customer: replied 7 months ago.
it is
Expert:  GM Tech (Cam) replied 7 months ago.

Have you tried starting in neutral?

Customer: replied 7 months ago.
we have
Expert:  GM Tech (Cam) replied 7 months ago.

Which engine is in your vehicle?

Customer: replied 7 months ago.
4.2 L V6
Expert:  GM Tech (Cam) replied 7 months ago.

Ok, check the CRANK Fuse, #17 and fuse #22 in the under hood fuse block please. Can you see if those get power either with the key on or the key in start please?

Customer: replied 7 months ago.
Both fuses are good
Customer: replied 7 months ago.
Everything works but door locks and inside lights can not start will not turn over battery is strong
Expert:  GM Tech (Cam) replied 7 months ago.

Does 17 get power with the key in start?

Also if you remove the starter relay and use a wire to manually connect the pins 30 to 87 using the numbers stamped on the bottom of the relay, does the starter turn?

Customer: replied 7 months ago.
Okay thank you for your help
Expert:  GM Tech (Cam) replied 7 months ago.

I am honestly thinking that your starter may indeed have failed and if this does not make the starter turn, then I would test for power on the small wire at the starter to verify power is getting there. If so, and it would only be with the key in crank, then your starter is bad. These are known for bad starters.

Please take a moment to rate my service. I will be available for follow up questions should you have any.

Customer: replied 7 months ago.
OK changed starter and then it crunk and then it cut off and now it won't crank doing the same thing again what is problem is it ignition switch
Customer: replied 7 months ago.
You there
Expert:  GM Tech (Cam) replied 7 months ago.

I am here now. Did you happen to hit any connectors when you did the change out?

Are any of the lights acting differently?

Did you jumper the starter relay pins prior to changing the starter?