p-1870 is a power train code my engine light came on recently the code said trans comp. slippage I'm thinking it is a transmission problem however I'm not having a transmission problem I removed the code erased it 3 months later the service lightcame on again I had the auto store check it with there obdll decoder it stated transmission transfer case 4x4 short circuit sitch possibly I bought the switch today have not put it on roghly $15 dollars I'm more than certain that is and has been my prolem all along a possible short in the switch plus today I noticed the 4wd indicator switch was not working properlyIt would not engage in either 4 low or 4 high .A dealeronce told me that the p-1870 code was hard to diagnois if i cannot figure the code correctly I will go to the horses mouth G.M. so far so good everyone that has an interest in their vehicle should buy a reasonable decoder I have the Actron about $80 dollars it has helped me save some money I hope some of this will be a benefit to some... Good Luck... Bill Overby Richmond Va.
P1870 is a transmission slipping code I think P0133 is the left front sensor (drivers side) but i will check on that. For the transmission code the first thing to do is service the transmission and check for debris in the pan....more than a "tablespoon" rebuild the transmission.... according to GM bulletin. Try the service and keep your fingers crossed
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