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.

Blower motor: Blower may not operate or may run on with key off requiring revised blower motor control module. (2003-05)

Engine knock: The engine (4.8L, 5.3L, or 6.0L) may knock for up to 30 seconds after a cold start. GM says this may be due to carbon buildup and is reportedly not harmful to the engine. (2002)

Engine noise: Due to corrosion of the knock sensor on the rear bank, the 5.7-litre engine may suffer from spark knock (ping) that gets worse on hard acceleration, illuminating the "check engineÓ light. (2002)

Engine noise: Some of the rocker-arm bearings may fail. The first indication may be needle bearings found in the oil when it is drained. All 16 rocker arms should be replaced. (2002)

Transmission slippage: The transmission may slip or there may be no 3rd or 4th gear (possibly accompanied by illumination of the "check engineÓ light) due to plugging of one of the shift solenoid valves. (2002)

Water leak: A water leak at the rear corner of the cargo box requires resealing of the catch cup. (2002)

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.

2000-04: The tailgate support cables may corrode, resulting in the sudden loss of the tailgate. Dealers will inspect and replace affected parts.

2002: In environmentally corrosive areas of specified "salt belt" states, unwanted antilock braking activation may occur, causing increased stopping distance during low-speed brake application.

2003: Certain vehicles may have been produced with an out-of-specification brake relief valve, making steering difficult when braking. Dealers will inspect and replace affected parts.

2003: In certain extreme impacts frame cross member could tear fuel tank resulting in fuel leakage. Dealers will install a fuel-tank shield on affected vehicles.

2003-05: Seatbelt routing for second-row center occupant may make it difficult to position the lap portion of the belt low around the occupant's hips.

2004-05: w/Bosch Hydro-Boost brake assembly: Hydraulic brake booster pressure accumulator may crack and separate during normal operating conditions, possibly issuing fragments and allowing fluid leakage.

2005: Under certain vehicle-starting conditions, shift-lever position indicator in instrument panel may not illuminate.