Check Engine Light With Code P1870 on Chevrolet Express 1500

Vehicles equipped whit a 4 speed automatic 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.

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Average mileage: 110,000 (51,000–165,000)
6 model years affected: 1996, 1997, 1998, 1999, more2000, 2001
10 people reported this problem
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2001 Chevrolet Express 1500 99,000 mi,
Hard shifting between 1 and 2