GMC Safari Problem Report
GMC Safari Check Engine Light With Code P1870
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.
replaced valve body - Visitor
Check engine light wont go off tune up changed oil - Visitor
code just came on it does it only going over an overpass or normal operating temp. - Visitor
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
I have an intermittent code 452. the service engine light will come on, check the code get 452...
The EGR valve may stick open causing a rough idle and the Check Engine Light light to illuminat...
Problem occurred on Sunday 1/2/2011 the van was trying to stall at a light. Managed to get it...
Error Code P0102
Problem occurs only at highway speeds.
Previously got Check Engine Light on...