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The Buick Terraza, Chevrolet Uplander, and Pontiac Montana use a MacPherson-strut front suspension. When replacing front struts, always tighten fasteners with the vehicle weight on the suspension and wheels aligned afterward. Common front strut-to-knuckle pinch bolt torque is approximately 89 ft-lb, while the strut-to-body top nut is typically around 30 ft-lb. The lower strut-to-knuckle clamp bolt should be tightened to specification and replaced if corroded. Accurate wheel alignment is required after any strut replacement.If the suspension has failed or is causing electrical warning messages, OBD2 codes may be set by the chassis control system. GM minivans can log suspension-related codes such as C1200 through C1210, which often indicate electronic suspension control malfunctions, leveling system faults, or communication errors with the body control module. These codes should be diagnosed with a scan tool capable of reading chassis/ABS codes. Visually inspect the struts for oil leakage, damaged bushings, broken coil springs, and loose mounting hardware. A mechanical inspection is essential because no scan code can confirm a physically worn strut.Always consult the vehicle-specific factory service manual for exact torque values before performing suspension work. Fastener torque is critical because the strut is a structural suspension component. Over-torquing can damage the strut rod, while under-torquing can cause knocking noises and premature wear.