Check Acura Fluid Pressure Sensors Before Replacement

This bulletin applies to 2014-2017 Acura MDX and 2015-2017 TLX with SH-AWD. If you suspect a leak at the rear differential axle seal or pinion seal, the actual culprit may be something loose or damaged above it. A loose or damaged fluid pressure sensor will drip rear differential fluid onto the axle seal. Also, a loose fluid pressure check port will drip fluid onto the pinion seal. 

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Jan. 30, 2023
Photo Credit: Mitchell 1
The left photo shows the pressure check port, which could drip onto the pinion seal. In the right photo, note that the fluid pressure sensor can drip onto the axle seal.

The left photo shows the pressure check port, which could drip onto the pinion seal. In the right photo, note that the fluid pressure sensor can drip onto the axle seal. 

This bulletin applies to 2014-2017 Acura MDX and 2015-2017 TLX with SH-AWD. If you suspect a leak at the rear differential axle seal or pinion seal, the actual culprit may be something loose or damaged above it. A loose or damaged fluid pressure sensor will drip rear differential fluid onto the axle seal. Also, a loose fluid pressure check port will drip fluid onto the pinion seal.

Before considering rear differential replacement/service, be sure to check these areas first. The repair could be as easy as tightening or replacing the fluid pressure sensor or tightening the fluid pressure check port.

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
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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.

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