check engine light could be a number of things. First and easiest is to check your gas cap. Make sure its on tight every time you fill up. If that's not the case then go to AutoZone or Checker or some autoparts chain around you and ask them to read the codes. Or even take it to the dealer if its still under warrinty. "check engine" is usually emisson system, something is not right in the system, the code that the computer generates will tell you what it is. You can also buy a code reader, but they get a little pricey.
If your Chevy trailblazer 2004 gauges are not working, check your fuel pump.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
check cat converter if it has 75000 miles or more
The check engine light sets a code for diagnostics and you need a code reader. Most auto parts stores sell code readers and most will check the codes for free.
First check the fuses.
Check the fuses first
It sounds like your fan clutch is bad.
Take it to a local PepBoys they can scan if you have a check engine light on and from there I can help you more with diagnosing a misfire incase you have multiple problems
If you don't have a code reader you can disconnect the battery cable for a couple of minutes and that will reset the light
Check the catlytic converter for blockage
Try to start it
If the check engine light is flashing as you are driving it means you are about to destroy the catalytic converter(s). Stop the engine and get it to a garage.
Check out gmtnation.com, There are lots of helpful people there, lots of How-To Tutorials for the Trailblazer.
If it is an automatic, the fluid should be at operating temperature. The transmission in park and the engine at idle. Remove the dipstick and wipe it dry and check the level. Do not overfill.
With a scan tool.
With a code reader. Have your local auto parts store read the code(s). They provide this service for free.
2002 Trailblazer take 7 qrts. Check your oil cap for the recommended weight
check the recalls alot of problems with the trans
How do you reset check engine light for the 2009 Chevy trail blazer?
It is a dipstick with a yellow end directly behind the oil dipstick. Pull it out, wipe it off stick it back in and check the level, be sure the engine/transmission is warm. The engine should be running to check the fluid level.
In US it says "SERVICE ENGINE SOON" in Canada it looks like an engine.
I had all sensors replaced in my 03 Trailblazer and the check engine light stiil comes on. Why?
When you change the battery you automatically reset the PCM. Any time you remove the negative battery cable for about 15-20 minutes you will reset the PCM. This will reset your Check engine light also. www.trailvoy.com Trailblazer enthusiasts forum with all the answers for your Trailblazer.