Owners report the 2006 Envoy's steering system fails in several ways. Power steering becomes stiff or completely unresponsive, making the wheel nearly impossible to turn at highway speeds or during low-speed maneuvers. Multiple owners describe needing two hands to steer at low speeds.
Fluid leaks plague the system. High-pressure hoses and lines crack and rupture, dumping fluid into wheel wells. One owner experienced identical failures at the same spot twice in three weeks despite two separate repairs, suggesting a design defect rather than isolated failure.
The StabiliTrac stability system engages when it shouldn't—during normal dry-pavement turns at 10–45 mph—causing vehicle deceleration, "growl" sounds, and loss of steering response. Worse, it fails to engage when needed, as evidenced by one collision when the system didn't activate on ice. A steering position sensor was identified as the culprit in one case.
Steering wheel lockup and binding occur unpredictably. One owner reports the wheel locks when turned right, causing uncontrolled swerves, and the vehicle steers opposite to wheel input during reversing.
Power steering pumps produce loud whirring, roaring, or grinding noise. One temporary repair lasted only months before the sound returned.
Engine stalling during turning maneuvers occurs repeatedly over months. One owner replaced the gear shift cable for $250 without fixing the problem. A dealer diagnosed a potential ignition switch issue in another case.
Failure modes owners describe
Steering System Stiffness and Difficulty
Steering wheel becomes stiff or nearly impossible to turn, especially at low speeds or during merging/cornering maneuvers. Multiple reports of power steering losing assist, making two-handed steering necessary.
When: Various mileages from 45,000 to 157,239 miles; can occur at highway speeds or low-speed turns
Symptoms owners cite: Steering wheel becomes stiff or very difficult to turn; Power steering assistance lost or severely reduced; Nearly impossible to steer at highway speeds; Requires two hands to turn wheel at low speeds
Repairs/costs cited: One owner replaced power steering hose/line for $200; another report of hose replacement at independent mechanic
Recalls/TSBs owners mention: Owner #5 references NHTSA Campaign 05V455000 (Steering); manufacturer informed but no apparent recall action taken
Power Steering Fluid Leaks
Cracks and ruptures develop in power steering high-pressure hoses, lines, and pneumatic pipes, causing fluid loss and system failure. One owner experienced identical leak failure twice at the same location within 3 weeks.
When: 100,000 miles reported in complaint #5; other mileages not specified
Symptoms owners cite: Power steering fluid leaking underneath vehicle; Visible cracks in steering lines going to rack and pinion; Rust-through at hose clamps on high-pressure pipes; Fluid pools in wheel wells; Steering becomes difficult as fluid depletes
Repairs/costs cited: Line replacement at independent mechanic for $200; recurrence of same failure at identical location within 3 weeks suggests design or manufacturing defect
Recalls/TSBs owners mention: Soft copper high-pressure hoses replaced twice at independent mechanics without resolving issue
StabiliTrac System Malfunction
StabiliTrac stability control system engages inappropriately during normal turns and acceleration on smooth asphalt, causing vehicle deceleration, steering effect changes, and wheel lockup. System fails to engage when needed (during ice/loss of traction situations).
When: Multiple complaints at various mileages and speeds (10–45 mph turns reported); one incident at 100,097 miles
Symptoms owners cite: StabiliTrac light illuminates during normal turns on dry asphalt; Vehicle momentarily slows during turns with 'growl' sound; Wheels lock up preventing steering response in parking situations; Steering wheel becomes unresponsive when StabiliTrac engages; System activates on gravel acceleration at normal speeds; System fails to engage during actual loss-of-traction events (ice)
Codes mentioned: ABS sensor codes (diagnostic check performed; sensors tested without fault found)
Repairs/costs cited: One owner required steering positioning sensor replacement after accident caused by system failure
Recalls/TSBs owners mention: Defective steering positioning sensor identified as known failure in 360 models; replacement resolved issue
Steering Wheel Lockup and Binding
Steering wheel locks or becomes unresponsive, preventing controlled direction changes. Vehicle uncontrollably swerves right or turns opposite of steering input, especially during reversal or after hitting bumps.
When: Shortly after purchase (complaint #6); various mileages
Symptoms owners cite: Steering wheel locks and cannot be turned right without causing full-vehicle swerve; Vehicle turns opposite direction from steering wheel input (reversal); Vehicle swerves right uncontrollably after hitting bumps; Constant swerving while in motion into adjacent traffic lanes; No predictability in steering response
Repairs/costs cited: Owner reported needing to manually pull steering wheel as if power steering completely absent
Power Steering Pump Noise and Whirring
Power steering system produces abnormal whirring, roaring, or grinding noise during steering wheel operation or engine start, indicating internal pump wear or cavitation.
When: Intermittent at first, becoming persistent over several months to years; one complaint at 100,000 miles
Symptoms owners cite: Whirring sound when turning steering wheel; Roaring noise during vehicle startup (intermittent); Super loud grinding noise from pump (one complaint); Sound recurs after temporary repair
Repairs/costs cited: One temporary repair at Beaman GMC Service in Nashville (Nashville area); sound returned within months
Engine Stall During Steering/Turning Maneuvers
Engine shuts off completely while steering into turns or during low-speed maneuvers, causing loss of power steering and brake assist. Restarting resolves issue temporarily. Occurs repeatedly over months.
When: Ongoing for 6 months in one complaint; another complaint after 6 months of issues leading to accident
Symptoms owners cite: Complete engine shutdown while turning or braking; Loss of power steering when engine dies; Loss of power brakes when engine dies; Occurs during low-speed city driving, not highway; Multiple occurrences per trip possible; Temporary fix via restart
Repairs/costs cited: One owner replaced gear shift cable for $250 (parts and labor) without resolving issue; misdiagnosed as transmission solenoid/sensor defect
Synthesized from 19 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.