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 A/C may quit or may occasionally blow warm air due to a bad low-pressure switch. (2003)

Electrical problem: If the OnStar system quits or won't come on (no power), but comes back to life if the fuse is removed for five minutes, the vehicle communications interface module must be replaced or else the problem will recur. (2005-06)

Fuel gauge: The engine may not start or may stall because the tank is empty yet the gauge shows fuel remaining, or the fuel gauge will not show full after refilling due to sulfur corrosion of the fuel level sender and if after treating with Fuel System Cleaner PLUS the problem remains, the sender may need to be replaced. (2003-06)

Fuel pump: The nozzle may keep shutting off during refueling due to the vent opening being collapsed inside the tank. (2003)

Keyless entry: The remote keyless system quits working and there was a campaign to reprogram the electronic module inside the passenger door and this fix will be made at no charge regardless of time or mileage. (2003)

Sunroof/moonroof: Water leaks at the sun roof requiring replacement of the kinked drain hoses with updated parts. Wind deflector rattles at cruise are due to deflector screws coming loose. (2003)

Transaxle leak: Shifting problems, loss of power, or inability to move at all may be due to a transfer case leak at the output shaft and, after repair, a longer driveshaft yoke must be installed. (2003)

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.

2003 Hummer H2: Ignition key in some vehicles could be removed with shift lever in position other than "park."

2003 Hummer H2: Windshield wiper motor could fail, due to improper manufacture.

2003-04 Hummer H2: Brake hydro-boost housing may be out of spec and O-ring seal may fracture, slightly affecting steering effort when braking or parking.

2003-06 Hummer H2 w/certain Fabrech aftermarket replacement Pitman arms: Pin could shear off, resulting in loss of steering control.

2004-05 Hummer H2: Second-row center occupant seat routing may make it difficult to position lap portion of belt around hips of occupants, especially smaller occupants.

2004-05 Hummer H2 w/Bosch hydro-boost brake assembly: Hydraulic brake booster pressure accumulator may crack and separate, which could result in leakage and increased steering/braking effort.

2006 Hummer H2: Power steering hose may not meet specification and could fracture during extreme steering maneuvers.

2006 Hummer H2: Tire and loading information label may show inaccurate vehicle capacity weight.