Intermittent loss of Check engine light

Ruddell

Member
I have a strange problem.

The Check engine light does not come on with the key up. It will come on for a split second at times, if I turn the key on and off really fast it will stay on but as soon as I stop it leaves. I redid the grounds for the ECM. Checked the plugs and chip on the ECM. At one time when I was turning the key back and fourth the engine light decided to stay on, and it started. I was stumped as to why, but everything worked consistently over and over until it didn't. While it was running I tapped on the ecm and played with all the plugs and wires and it didn't skip a beat. It will not start if the light dosnt come on and stay on with the key up like every truck supposed to do. I hope this makes sence, I'm lost. Does anyone happen to have any ideas about this from your experience?
 

QWERTYphoon

Motley Driver Award 2009
It's the bulb, or more specifically the membrane the bulb seats in, pull apart gauge cluster, replace bulb.
 
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