Acura EPS Needs an Update to Shift
This bulletin applies to 2014 and 2015 Acura MDX vehicles. After driving in reverse and steering, a buzz or grunt may be heard after shifting from reverse to drive and turning the steering wheel.
The software that manages the electric power steering (EPS) is designed to provide good steering feedback in all operating conditions. To acquire the correct feel, different settings are required in reverse and forward directions. The improved software is designed to prevent the buzz or grunt during the transition of rapidly changing from reverse to drive while turning the steering wheel.
The corrective action involves updating the EP control unit software, using application version 3.01.40 or later and HDS software version 3.015.020 or later. Before beginning the repair, make sure that both the HDS and MVCI are updated. If the MVCI displays “This vehicle does not need an update at this time” during the update, the software has already been installed.
YEAR/MODEL PROGRAM ID PROGRAM P/N
2014-2015 MDX 2WD Tech................. Z5A01......................... 39990-TZ5-A01
2014-2015 MDX 2WD Advance............Z5A61......................... 39990-TZ5-A61
2014-2015 MDX SH-AWD Tech............ Z6A01..........................39990-TZ6-A01
2014-2015 MDX SH-AWD Advance.......Z6A61..........................39990-TZ6-A61
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.