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This 2015 GMC Sierra incurred complaints about the following:   4×4 feels like its jumping, 4×4 failed and made loud noises, 4×4 service message on, vehicle stuck in 4×4.   Parts that required diagnosis, adjustment, repair or replacement are:  Replaced front differential. Fault code C398, range actuator position – range position correlation.  Removed range position sensor.  Performed motor […]