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AZTechBrian
AZTechBrian, ASE Certified Technician
Category: Chevy
Satisfied Customers: 708
Experience:  Owner
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Same as whats going on in this post, 02 trailblazer, 2002,

Customer Question

same as whats going on in this post
JA: What is the model/year of your Chevy?
Customer: 02 trailblazer
JA: What year is your Chevy?
Customer: 2002
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: replaced the selonid on the floor
JA: Anything else you think the mechanic should know?
Customer: car doesnt start anymore
JA: Have you checked the battery, particularly the terminal connections? Are they corroded?
Customer: they are fine
Submitted: 1 year ago.
Category: Chevy
Expert:  AZTechBrian replied 1 year ago.

Hello. I don't see a description of the issue your having. What's the problem your having?

Customer: replied 1 year ago.
it shifts freely and the key didnt want to come out but i opened up by the column and pressed the button and it releses but now the car still shifts freely and now doesnt want to start
Expert:  AZTechBrian replied 1 year ago.

it sounds like something with your shift linkage. When you say it shifts freely, does it feel like the gear selector is not connected anymore? or more like it's just sloppy and loose? If you push the gear selector in park and put a little pressure on it will the engine start then?

Customer: replied 1 year ago.
im a mechanic but i needed the help i replace the shifter cable thats not the issue it shifts without pressing the brake
Expert:  AZTechBrian replied 1 year ago.

if it shifts without pressing the brake then you probably have a damaged shift interlock solenoid

Customer: replied 1 year ago.
the one that goes on the floor in the center console?
Expert:  AZTechBrian replied 1 year ago.

correct. If you are able to take it out of park without pressing the brake pedal then I would suspect the shift interlock. Was that the issue you are having?

Expert:  AZTechBrian replied 1 year ago.

and, yes.. it would be located at the floor shifter.

Customer: replied 1 year ago.
already replaced it with an oem part still does the same
Expert:  AZTechBrian replied 1 year ago.

Before you replaced it, did you check to see if the problem was that it was getting energized even with the brake pedal not depressed?

Customer: replied 1 year ago.
i did and it wasnt
Expert:  AZTechBrian replied 1 year ago.

If that's the case, and the shift interlock isn't damaged or getting energized when it shouldn't be, then something is damaged in the shifter assembly.

Customer: replied 1 year ago.
but why would the key not want to come out
Customer: replied 1 year ago.
why wouldnt it start
Expert:  AZTechBrian replied 1 year ago.

I suspect what is happening is that your gear selector isn't going fully into the park position. either something is damaged in the linkage or something needs to be adjusted. That would also cause the gear selector to move without the brake pedal depressed. because it was never fully in park to begin with taking the interlock out of the equation.

Expert:  AZTechBrian replied 1 year ago.

If it's not fully in park, it will not start thanks to the NSS, it also will not allow you to remove the key and will also not allow the interlock to lock the selector.

Customer: replied 1 year ago.
ok so i should take apart the assembly and see what i find there
Expert:  AZTechBrian replied 1 year ago.

I would first make sure that there isn't something out of adjustment in the linkage. That is most suspect in my mind right now.

Expert:  AZTechBrian replied 1 year ago.

out of adjustment or damaged somewhere in the linkage.

Expert:  AZTechBrian replied 1 year ago.

hold on man.... let me check something

Customer: replied 1 year ago.
the linkage underneath the car?
Expert:  AZTechBrian replied 1 year ago.

either under the car or at the gear selector in the car. Check this TSB too.

TECHNICAL SERVICE BULLETIN

Customer: replied 1 year ago.
i have the boot off so that cant be it
Expert:  AZTechBrian replied 1 year ago.

alright. just thought I would throw that out there. Your not getting fully into park, whether it's an issue in the linkage or an issue in the shifter assembly. check over the linkage good and try adjusting it. if that isn't the problem then it's in the shifter.

Customer: replied 1 year ago.
even if the indicator on the cluster is underlined park?
Expert:  AZTechBrian replied 1 year ago.

yes. it could still not be fully in park. hold on, i'll get you the procedure for adjusting it

Expert:  AZTechBrian replied 1 year ago.
Customer: replied 1 year ago.
alright let me print this and see what happens, i should have someone up in the air correct'
Expert:  AZTechBrian replied 1 year ago.

you should be able to do this alone.

Customer: replied 1 year ago.
alright give me a sec lets see what happens
Customer: replied 1 year ago.
still nothing, can the neutrual switch come in the play as well
Expert:  AZTechBrian replied 1 year ago.

it could prevent it from starting, yes but all the symptoms your describing point to it not going into park. Did you say that you replaced the shift cable earlier in the conversation?

Customer: replied 1 year ago.
yeah i replaced it
Expert:  AZTechBrian replied 1 year ago.

was this a problem before it was replaced?

Customer: replied 1 year ago.
it started when the little plastic piece where it connects underneath the car broke
Expert:  AZTechBrian replied 1 year ago.

Ok. That totally reinforces the idea that the issue is that it's not going totally into park and the problem being with the linkage and not the shifter assembly. Look over everything well. Try adjusting it again. Disconnect the cable, put it into park and see if the key goes in, out, engine starts, etc. There is something going on with the shift cable.

Customer: replied 1 year ago.
alright let me check again
Customer: replied 1 year ago.
still nothing manim thinking it might be the neutrual swtich
Customer: replied 1 year ago.
thats what changes the gears and thats where the bot***** *****nk connects too
Expert:  AZTechBrian replied 1 year ago.

if you disconnect the cable, does it work normally then?

Customer: replied 1 year ago.
it does the same
Expert:  AZTechBrian replied 1 year ago.

with the linkage disconnected, it's exactly the same? what i believe happened when the plastic item you spoke of broke, was the gear selector was freed up and allowed to move fully into park. Tension was released from the cable. Maybe I am confused as to what's going on?

Customer: replied 1 year ago.
yeah with the linkage disconnected from underneath the car where it connects on the neutral switch it does the same
Expert:  AZTechBrian replied 1 year ago.

when you disconnected the linkage, you did re'put the selector into park, correct? made sure it was fully engaged in park?

Customer: replied 1 year ago.
yeah it was fully in park
Expert:  AZTechBrian replied 1 year ago.

and still exhibited all the same symptoms as before?

Customer: replied 1 year ago.
yeah and now it wont even turn on
Expert:  AZTechBrian replied 1 year ago.

that's probably because your transmission isn't in park and your NSS recognizes that.

Customer: replied 1 year ago.
why wouldnt it notice it and nss?
Expert:  AZTechBrian replied 1 year ago.

neutral safety switch will prevent you from starting the car when it's not in park or neutral. It wont however cause the selector lever to move out of park without the brake pedal applied. That's the job of the shift interlock.

Customer: replied 1 year ago.
sso what could be the cause of that
Expert:  AZTechBrian replied 1 year ago.

either the nss is out of adjustment, or the transmission not being in park. If you remove the selector cable, and manually put the transmission in park, and make sure the gear selector is also in the park position, will the truck start?

Expert:  AZTechBrian replied 1 year ago.

not remove it, disconnect it..

Customer: replied 1 year ago.
it wont
Expert:  AZTechBrian replied 1 year ago.

ok. I am going to open this up to the other techs. hopefully one of them will know what's up. sit tight..

Customer: replied 1 year ago.
thanks
Customer: replied 1 year ago.
anyone else give you ideas