GMC Suburban 2500 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your GMC Suburban 2500
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GMC Suburban 2500 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.
The pitman arm and/or lower ball joints may wear causing loose steering and alignment issues. Replacement of worn components will be necessary before the alignment can be properly set to specification.
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.
GMC Suburban 2500 Questionsstart but will not run long (1 answer)
truck had been starting &running ;set for two weeks.will start and then shut off.
checked;fuel pump/prusser ;all electric to injects all OK; spray starter fluid [will run as long as you spray]
start up run 15 or 20 sec. then shut off. does carb. have pump in it
Starter died trying to start with dead fuelpump, both are replaced starter switch is good, new starter+pump work. But it still won't get fuel, maybe the fuel sending unit? I keep hearing people suggest the distributor, but it just had a tune-up and ran buetifuly
All the time.