GMC Suburban 1500 Problem Report

GMC Suburban 1500 Check Engine Light With Code P1870

(4 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:
Won't start if left off for more than two days. Once started, starts again first time every tim...
We've got a 97 suburban 1500; the engine light comes off and on, have tried different grades of...
A Loose or worn gas cap may cause Check Engine Light to illuminate.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "
The distributor may develop internal faults. This can cause a rough running engine or stalling...