2012 Infiniti Qx56

For the 2012 Infiniti QX56, engine complaints make up the largest share of owner reports, with timing chain failure being the most consistently described problem. Owners report symptoms including violent shaking under acceleration, check engine lights, and loss of power, often diagnosed as a timing chain that needs replacement. Several owners also describe a high-pressure fuel pump leaking, which some link to accelerating engine wear. The fuel and propulsion system draws the next-highest complaint volume, with owners reporting hesitation, stalling, and catalytic converter failures triggering check engine warnings. Airbag complaints round out the top three reported systems, though at lower volume. The timing chain issue appears across multiple reports and tends to surface with specific trouble codes, rough running at lower speeds, and the vehicle becoming undrivable if left unaddressed.