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2000 Chevy Truck Codes

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

What does this mean? Can I fix it myself or do I need a professional?
Saturday, March 1st, 2008 AT 10:40 AM

2 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
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://www.2carpros.com/forum/automotive_pictures/62217_Test1_2.jpg



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



https://www.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...
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Saturday, March 1st, 2008 AT 10:55 AM
Tiny
BULLA73
  • MEMBER
  • 2 POSTS
I'll check it out and will post results here. Thanks
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Saturday, March 1st, 2008 AT 12:26 PM

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