1999 GMC 3500 Pickup Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1999 GMC 3500 Pickup

1999 GMC 3500 Pickup Problems

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.

Check Engine Light and Misfire Due to Stuck Fuel Injectors

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.

Alternator May Fail and Cause Noise and Dead Battery

The alternator may fail causing the battery to go dead, or an abnormal noise may develop. The dash warning light may or may not illuminate. A failed alternator will require replacement.

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1999 GMC 3500 Pickup Questions

my 1999 GMC truck turns over but won't start (2 answers)

There is good fuel pressure. is there a fuse that can cause it not to start?

Why is my motor hopping and skipping under a load or into the wind? (1 answer)

The comp is not throwing any codes, and I've replaced the plugs, wires, distributor, the electronic ignition switch, o2 sensor, crank sensor, cam sensor, fuel filter, air filter, and checked the fuel pump. I'm out of ideas, and can find nothing online and the shop couldn't figure it o...

454 vortec enginge swap to a 350 tbi what equipment should be transferred ? (1 answer)

blown 454 engine being removed. putting in a 350 tbi . what equipment should be transferred to make this work? engine & computer ? just have to figure out how to wire computer for the 350 tbi into the truck right?

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1999 GMC 3500 Pickup Recalls

Seat 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.

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1999 GMC 3500 Pickup Reviews

This year paint was not GMC's best. I have had problems with the paint peeling off in strips.Overall strong truck 7.4 454 big block. I tow a 30' toyhauler and this truck can pull.

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