I have a 2004 chevy trailblazer that at times will not start with the key and also will not turn off with the key.
Check for OBD2 codes, primarily a code indicating PCM memory is corrupt. My Trailblazer at times wouldn't turn over and start. Nothing at the key. When you attempt to start the vehicle and you turn the key to the start position, the PCM sends a signal to the starter relay to start the engine. Youtube video showed a mechanic warming the PCM with a hair dryer, and it would start. Tried it on mine and it started fine. If it is the PCM, the remedy is PCM replacement. Got mine from pcmforless.com about $100.00. They had to program the new PCM with the vehicle vin number. Once installed no more problems.
SOURCE: 2004 Chevy Trailblazer radio and CD player works, but no sound
if you have installed a new cd player in there then the propblem could be that your speaker wires and either touching each other or grounding them selfs out.. pull of the cd player and check to make sure all the speaker wires are covered properly and no bare wires are exposed.. if you still have a factory cd player in it then you will probably need to take it to a dealership to have it checked out..
SOURCE: I have a 2004 chevy trailblazer when I turn the
I had the same problem and was told the air intake valve was not opening and needed to be cleaned, to allow the air flow.
SOURCE: 2007 Chevy Trailblazer won't start
the ignition switch is a very common problem with these vehicles. when the problem is occuring check the pink wire coming off the ignition switch and see if there is power. the computer controls the starter on this vehicle and if there is insuficient voltage going to the ecu it will not power up.
SOURCE: 2004 chevy trailblazer-Reduce engine power
You need to get the fault codes read to determine where the problem is that set the SES light. Autozone will scan your car at no charge. At some point you will need to get a mechanic involved to further diagnose the codes.
SOURCE: starter on 2004 chevy trailblazer
When my battery goes dead and the key is in the acc postion then i cant get the key out
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