2000 Chevy Truck Codes

2000 CHEVROLET TRUCK
125,000 MILES • V8 • 2WD • AUTOMATIC
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BULLA73
  • MEMBER
  • 2 POSTS
P1820 Internal Mode Switch Circuit A Low.

What does this mean? Can i fix it myself or do i need a professional?
Mar 1, 2008 at 10:40 AM
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MERLIN2021
  • ✓ASE Certified Mechanic
  • 17,250 POSTS
  • ASE Certified Mechanic
This P1820= transmission range switch A voltage low...this is what used to be called the neutral saftey switch in the old days, test the switch, and the connector...


https://images.2carpros.com/forum/automotive_pictures/62217_Test1_2.jpg


https://images.2carpros.com/forum/automotive_pictures/62217_Test2_3.jpg


https://images.2carpros.com/forum/automotive_pictures/62217_Test3_copy_1.gif

If a new switch is needed, it must be set up with a gm scantool...
Mar 1, 2008 at 10:55 AM
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BULLA73
  • MEMBER
  • 2 POSTS
I'll check it out and will post results here. Thanks
Mar 1, 2008 at 12:26 PM
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