Check engine light doesnt work right

Asked by Jun 07, 2017 at 12:25 AM about the 2000 Chevrolet S-10 2 Dr LS Standard Cab Stepside SB

Question type: Maintenance & Repair

With the key on the light will come on and
stay on. With the truck running though it
wont come on even with the cat off I even
pulled a spark plug and still nothing. Now
the truck wont start but once in awhile and
runs fine when it does. and im thinking its
the pcm at this point but I would like to have
the light give me a code first. I dont know
when the light last worked right.

To be clear the light bulb is not burned out.
And every fuse and relay is good and the
right ones in the truck.

2000 Chevy s10 4cyl 2.2 flex fuel Manual
transmission

3 Answers

70,325

To set a trouble code for the catalytic converter the PCM must run the diagnostic test for the converter and have it fail 3 times. If your gas tank is below 1/4 or above 3/4 it won't run the diagnostic test so no trouble code will set and the check engine light won't come on. As for removing the spark plug you'll have to drive it a short distance. Then the check engine light will begin flashing. Eventually, usually after about 10 minutes or so of this, a "hard" misfire code will set and the light will remain on. You or a shop can check the operation of the light by plugging into the computer with a scan tool that's capable of commanding the light on. If the PCM doesn't recognize the command to turn on the check engine light, the PCM is bad. HTH. -Jim

Okay because Ive been rough on it and nothing triggered it. And my scanner doesnt do it either I thought it was the pcm but I thought I would get another opinion before I spent money on it. Thank you sir

70,325

You're welcome. Glad to help. -Jim

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