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Problems for specific GMC 3500 Pickup years:

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Most reported 1999 GMC 3500 Pickup problems

 

Verified for the GMC 3500 Pickup

The inside and outside door handles are prone to breaking.

17 Reports
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Verified for the GMC 3500 Pickup

Power brake systems using "hydro-boost" may leak power steering fluid from the hydro-boost unit located behind the brake master cylinder. Replacement of the hydro-boost unit is the common repair to correct this concern.

17 Reports
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Verified for the GMC 3500 Pickup

The power door lock actuators may become slow to operate or stop working completely and require replacement.

15 Reports
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Verified for the GMC 3500 Pickup

The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.

14 Reports
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Verified for the GMC 3500 Pickup

The windshield wipers may not work intermittently due to a faulty wiper motor control board. Our technicians tell us that lightly taping on the wiper motor when the fault occurs should temporarily get the wipers working again. Some vehicles were recalled for this problem and some were not. You will need to check with your local dealer to find out if a specific vehicle was included.

12 Reports
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Verified for the GMC 3500 Pickup

A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.

11 Reports
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Verified for the GMC 3500 Pickup

The anti-lock brake system (ABS) front wheel speed sensors are prone to failure. When a sensor fails, the ABS warning light may illuminate and/or the ABS system may activate erratically.

11 Reports
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Verified for the GMC 3500 Pickup

The air conditioning compressor may develop an abnormal noise and require replacement. We recommend that whenever an AC compressor is being replaced for a noise condition, a filter kit should be installed to prevent any metal particles in the system from damaging the new compressor.

11 Reports
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Verified for the GMC 3500 Pickup

The quick-connect fittings for the heater hoses tend to leak engine coolant. This problem commonly occurs because the metal housing has become brittle, which can break and cause leaks.

11 Reports
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Verified for the GMC 3500 Pickup

The fuel pump may fail causing the engine to stall and not restart. Our technicians recommend replacing the fuel filter every 30,000 miles to help prevent undue strain on the fuel pump.

11 Reports
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Verified for the GMC 3500 Pickup

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.

6 Reports
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Verified for the GMC 3500 Pickup

One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.

5 Reports
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Verified for the GMC 3500 Pickup

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.

5 Reports
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Verified for the GMC 3500 Pickup

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.

5 Reports
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Verified for the GMC 3500 Pickup

An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.

5 Reports
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