The transmission may develop a harsh 1-2 shift and/or illumination of the Check Engine Light with code P1870 stored. This can be caused by wear of the bore for the TCC isolator and regulator valves in the valve body. This condition does not commonly occur until the transmission reaches normal operating temperature. If the valve body is worn, replacement will be necessary to correct this concern.
Check Engine Light With Code P1870 on Chevrolet Camaro
Average mileage: 180,000 (180,000–180,000)
Drive Train affected: Automatic Transmission
7 people reported this problem
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Cleared the code: came back on a week later, still no code???
...on. After 2 tanks of 93 and no success with it turning light off, I went back to 87. I get no Knocking with any octane. Dealer says to just keep chasing down the codes until it’s finally fixed but t...