Having problems with your 1999 GMC Sonoma ?

20 amp ECM B fuse

\015 In the black box under hood there is a 20 amp fuse labeled ECM B. I was told it is tied to the fuel pump and computer. Earlier this summer it kept blowing the fuse, I would replace it and be on my way. Afew days later it would blow again, so I ask one of your experts what it could be. I was told it was a short in the fuel pump itself. I put it off for awhile knowing it was a big job. Got tired of blowing fuses so Finally I changed the pump. All went well and I have driven the truck 4 or 500 miles since. The other day it blew again, only this time, it will not take a fuse, it blows right away. Any idea's?\015 Posted / edited by AnonymousUser on : 15-04-2019

Answers :


check the the injector connecter wires if they are brittle

Go through the wiring inch by inch and look for a spot that is shorting to ground.
Repair Help & Product Troubleshooting for 1999 GMC Sonoma

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