About 3 times in the last week my trailblazer was slow to start when the key was turned. Tonight, my vehicle died and would not start for a few minutes. Eventually after sitting, it did turn over and I was able to start it. This vehicke has about 28,000 miles on it. What's wrong?
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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.
The way to reset the oil light on your Trailblazer is.You first turn the key on but do not start the vehicle.Press the gas pedal 3 times all the way to the floor within 5 seconds.The change oil light will flash several time then go out.The oil life has been reset.Remember don`t start the vehicle just key on engine off.Hope this helps.Good luck.
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.
Sounds like an antitheft problem I would start with the antitheft system. Usually when you only have one key all keys have to be programmed together even the original. When you have more than one it is easy to program additional keys.
I have had a similar problem with my 06 Trailblazer SS. Took it to the dealer and apparently this is a common occurrence. They replaced my key cylinder and explained that this was because the cylinder was intermittently not completing the start circuit. It seemed to work after that. Now in the dead of winter I am having more starting issues with the vehicle.