Chevrolet Silverado 1500 Problem Report

Chevrolet Silverado 1500 Check Engine Light With Code P1870

(5 reports)

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.

With the a/c on and the cruise control engaged on a hot day I get the hard 1,2 shifts with the p1870 code. -
Related Items:
One or both secondary air injection check valves may become restricted causing poor air flow re...
About 35000 miles, check engine light came on. Dealership repaired. Stated a sensor on top of g...
my truck is a 1997 not a 1999. The truck will idle just fine but when i put it in drive and giv...
Check engine light comes on intermittently...especailly when hauling a load.

Related Content