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.

Check-engine light: The check engine light may come on due to failure of the EGR valve. The Delphi valve is to be replaced with a Seimens valve kit and have the PCM flashed. (2005-06)

Electrical problem: The PCM was being replaced for a defective chip under a voluntary emissions recall because it affected the fuel pump and EGR system. (2005)

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)

Engine noise: A whistling noise from the 3.5L engine during acceleration is corrected by replacing the PCV tube. (2005)

Engine stalling: The engine may not start, may start then quit, and/or assorted warning lights may glow because the wiring connector under the driver seat may get wet and the contacts corrode. (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. (2005-06)

Headlights: The headlights and interior lights may flicker requiring replacement of the alternator. (2005)

Horn: The horn may require extra pressure on some spots of the steering wheel pad. Softer springs are available to retrofit. (2005-06)

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.

2005 Terraza: The emergency brake may not fully disengage when released, causing unintended braking while accelerating, decelerating, or coasting. Dealer will inspect the parking brake lever and replace the rear brake calipers as necessary.

2005 Terraza: When parking brake is released, driver may notice unintended braking while accelerating, decelerating or coasting, accompanied by noise from rear of car.

2006 Terraza: Some vehicles may have a misprinted tire and loading label that lists inaccurate capacity weights. Dealer will replace the label.