We recently just purchased a 2012 QX56 with 100k on it. 4 weeks after purchase the vehicle threw a P062B code. The engine started sputtering and loss of power going uphill. This does not happen constantly, it comes and goes. Took it to dealership and they tell us that 2 wire harnesses for ECM & 1 relay need replacing. Grand total of $9000.00 to replace them. Has anyone experienced this issue before? I find it difficult to believe that 2 wire harnesses cost 9k to replace.