1994-2004 GMC Sonoma: Reliability
Updated: 11/23/08
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Our reliability study for this generation GMC Sonoma includes details on average repair costs, manufacturer recalls, and everything you need to know to gauge the long-term reliability of this generation GMC Sonoma .
Trouble Spots
Consumer Guide's® Auto Editors have scoured repair bulletins and questioned mechanics to search
for commonly occurring problems for a particular vehicle. In some cases we also give possible manufacturer-suggested
solutions. In many instances these trouble spots are Technical Service Bulletins posted by the manufacturer,
however, we have our own expert looking at additional vehicle problems.
Air conditioner:
The HVAC system mode switch gets stuck in the vent position as oil gets into the control head as a result of a leaking vacuum switch on the transfer case and a redesigned switch is available. (2001-03)
Doors:
The power door locks may not operate due to a rubber bumper falling off of the actuator arm. (1997)
Engine knock:
Engine knock in the 4.3-liter engine is usually eliminated by using an oil filter with a check valve. If this does not work, GM has revised PROMs for the computers and will even replace the main bearings. (1990-95)
Engine misfire:
The EGR valve may stick open due to carbon deposits causing rough idle. (1994)
Engine temperature:
Poor cooling or irregular gauge reading possible after water pump replacement. (1994-95)
Engine temperature:
Overheating and coolant loss may be due to rough surface on radiator filler neck. Neck should be sanded smooth and cap replaced. (1999-2000)
Fuel pump:
The fuel pump may run after the key is turned off. (1994-95)
Hard starting:
Engines with TBI may be hard to start after hot soak. (1994)
Consumer Guide® Estimated Repair Costs
This table lists costs of likely repairs for comparison with other vehicles. The
dollar amount includes the cost of the part(s) and labor (based on $50 per hour) for the
typical repair without extras or add-ons. Like the pricing information, replacement
costs can vary widely depending on region. Expect charges at a new-car dealership
to be slightly higher.
| Item Name | Repair Cost |
| A/C Compressor | $550 |
| Alternator | $255 |
| Automatic Transmission or Transaxle | $750 |
| Brakes | $210 |
| Clutch, Pressure Plate, Bearing | $545 |
| Exhaust System | $450 |
| Radiator | $410 |
| Shocks and/or Struts | $345 |
| Timing Chain or Belt | $420 |
| Universal Joints | $190 |
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