Question about 2002 Chevrolet Blazer
How do I reset the check engine light once the problem has been fixed?
The check engine light will reset it self after the third start up, as long as there is no other issues that is causing your check engine light to come on.
You can how ever reset your PCM to default by turning the ignition key to the run position "engine not running" and pulling the fuse ECM1 for 1 min and then placing it back in. Turn the key off and then back to the run position for 30 seconds, then start the engine. This will erase any DTC codes in the PCM history and if the check engine light comes back on there is still an issues that needs to be addressed.
Note: the engine my Stall when your first start the engine, but let it and don't touch anything. Just restart it the second time, let it idle for 1 min and then go for a test drive. The transmission my have a firmer shift but it should be back to normal after your test drive. The PCM is just relearning the engine and transmission's input like the day it came off the assembly line.
Thank you for using fixya and good luck.
Posted on May 11, 2010
Unplugged tha bettery few minutes;if the check light turn on again, you have any fault code there and needed scannign for know what code is. With this number code we can tell you other details.
Posted on May 11, 2010
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Posted on Jan 02, 2017
If you are a DIY'er you can get a OBDII scan tool that connects to your laptop that can tell you the error code and allow you to reset your check engine light. This will save you $80 each time over going to a mechanic for a diagnostic. They are easy to use and will help you know what the issues are if you do have to go to a mechanic.
Check out http://www.fitityourself.netau.net/OBDII.html
Or you can try disconnecting your vehicles negative battery lead for 5 minutes. That should clear the code. if you check engine light comes back on after several days, you still have a problem
Posted on Apr 14, 2010
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