1999 GMC 2500 Pickup Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1999 GMC 2500 Pickup
Verified by mechanics, reported by drivers like you
1999 GMC 2500 Pickup ProblemsCheck 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.
One or more fuel injectors may become stuck closed causing an engine misfire and the Check Engine Light to illuminate. Our technicians tell us that this problem can be caused by some fuel additives. There are special procedures which may be able to restore the affected injector. If this fails the affected injector must be replaced.
The engine idle may be lower than normal due to deposits built up on the throttle body, which can restrict air flow at idle. To low of an engine idle can result in a stalling condition. Performing a throttle body service will generally correct this concern.
1999 GMC 2500 Pickup Questionsfuel pressure (2 answers)
what is fuel pressure koeo and koer?
I cannot get the rear braske drum loose from the axle so i can check the shoes - any suggestions?
1999 GMC 2500 Pickup RecallsSeat Belts Not Proper For Vehicle
The seat belts installed on the vehicle may not meet proper federal requirements. Dealers will replace both front seat belts free of charge to resolve the concern.