GMC 2500 Pickup Problem Report

GMC 2500 Pickup 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.

Related Items:
The distributor may develop internal faults. This can cause a rough running engine or stalling...
CHECK ENGINE LIGHT ON ACTS LIKE ITS NOT GETTING ENOUGH GAS CHUGS GOING DOWN ROAD JUST SLIGHTLY...
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/...
The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engin...