Steering lock-up is the dominant complaint. Five owners describe the steering wheel seizing solid while driving, typically at highway speeds, requiring violent force to unlock—often producing a loud pop from the steering column. One owner with 20,000 miles reports it happened six times; another experienced it twice in 30 days despite dealer refusal to repair. A shop owner who is an ASE Master Tech confirmed the issue as "crazy dangerous." Dealers consistently cannot reproduce the failure when the vehicle is in their possession.
One complaint specifically identifies power steering assist motor failure on a hybrid model—the truck lacks a traditional power steering pump, and the owner notes other GM models have recalls for this defect while Sierras and Silverados were omitted from coverage.
A steering position sensor connector failure was documented during freeway driving, accompanied by rough engine operation and eventual stalling.
One incident involved an exhaust manifold heat shield that rusted, detached, and fell onto the steering column while the truck was in motion, mechanically locking the wheel.
Most concerning: none of these failures produce warning lights or prior indication before they occur, leaving drivers with no advance notice in situations where they may be unable to safely pull over.
Failure modes owners describe
Steering wheel lock-up / seized steering
Steering wheel locks in place or becomes immovable while driving, typically requiring significant force to unlock. A loud pop or crack noise from the steering column area often accompanies the unlock event. Occurs at highway speeds and during normal driving maneuvers.
When: Early ownership; reported at mileages of 1,500, 20,000, 35 mph, 54,000 miles, and on multiple occasions within 30-day periods
Symptoms owners cite: Steering wheel seized and immovable; Wheel locked in turned position; Loud pop or cracking noise from steering column when forced; Requires excessive force to unlock (two hands)
Repairs/costs cited: Dealers unable to reproduce the failure; one dealer refused repairs. No confirmed repair procedures documented in complaints.
Power steering assist failure (hybrid EPS motor)
Complete loss of power steering assist on hybrid GMT900 platform with electric power steering motor instead of traditional pump. No warnings precede failure. Dealer unable to diagnose; other GM models have recalls for this defect, but Sierras and Silverados omitted.
When: During normal operation; specific mileage not stated
Symptoms owners cite: Power steering assist lost; Manual steering required; No prior warning
Repairs/costs cited: Dealership unable to diagnose; electric power steering assist motor identified as failed component, not control module
Recalls/TSBs owners mention: Other GM models have recalls for similar failures; Sierras and Silverados reportedly excluded from recall coverage
Steering position sensor connector failure
Steering position sensor connector breaks, causing electrical disconnection and steering system malfunction. Associated with rough engine operation and eventual engine shutdown.
When: Reported on highway during extended freeway driving
Symptoms owners cite: Engine running rough; Engine stalling; Loss of steering control signal
Repairs/costs cited: Broken throttle body sensor and broken steering position sensor connector; vehicle towed to dealer
Exhaust manifold heat shield corrosion and mechanical interference
Heat shield on exhaust manifold rusts and detaches, falling onto steering column and mechanically locking the steering. Occurs while vehicle is in motion.
When: Not specified; single report documented
Symptoms owners cite: Heat shield falls onto steering column; Steering momentarily locked by physical obstruction; Occurs while vehicle in motion
Repairs/costs cited: Owner forced steering to work after shield dislodged
Synthesized from 11 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.