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Originally Posted by birdboyd
Hello all,
Does anyone have any idea what causes a P1875 code on a 2000 Blazer LT? I understand it is dealing with the electrical side of 4 lo, but why would it cause me sluggish acceleration and loss of RPM's? Also, what does a 4wd module do when it goes out? My 4wd switch currently will either have no lights on or sometimes it will randomly flash all 5 lights at once, but overall the switch is dead. It does not respond to any buttons being pushed. I tried a new switch but it didn't work either.
I have looked at the previous threads, but I can't troubleshoot something that won't even try to go into 4wd. It is completely dead. Anyone with any suggestions?
Thanks in advance
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The P1875 code is for 4W low switch circuit.
Do you have a good engine/transmission capable scanner and volt/ohm meter?
If so a good factory repair manual and or A all data sub will led you threw the repair.
http://www.alldata.com/products/diy/index.html