1999 Chevy Express ECM-1 20 Amp Fuse blows

1999 CHEVROLET EXPRESS
104,680 MILES • V8 • 2WD • AUTOMATIC
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RYAN1398
  • MEMBER
  • 1 POST
I was advised to replace ecm module and I did . it worked for about a month. I also have a misfire code #1 cyl since the new ecm module was replaced and the ECM-1 fuse blows.the ecm 1 fuse was blowing before I replaced the old ecm module. the mechanic believed that the ecm was bad. it appeared that he was right but I now have the same problem
Jan 12, 2010 at 2:09 PM
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DAVE H
  • ✓Experienced Mechanic
  • 13,383 POSTS
Hello .. thanks for the donation .. much appreciated Unplug the ECM wiring connector from the ECM .. replace the fuse .. if the fuse still blows, you have a bad wire somewhere .. if the fuse does not blow, the ECM is bad and needs replacing again ! Hope this helps


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Jan 13, 2010 at 10:40 AM
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