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Whining Noise from Rear of 2016 RDX SH-AWD

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Mike T. · rep 0 · May 26, 3:56 AM · 1 replies · solved · Question

Vehicle: 2016 Acura RDX SH-AWD

I've started hearing a distinct whining or humming noise coming from the rear of my 2016 Acura RDX SH-AWD. It's most noticeable at highway speeds, around 50-70 mph, and seems to get louder with acceleration.

It's not a tire noise, as it persists even after rotating tires. It sounds like a mechanical whine, almost like something is struggling or not properly lubricated. It's quite concerning.

Could this be related to the SH-AWD system, specifically the rear differential? The car has about 90,000 miles on it. I've read about differential fluid changes, but I'm not sure if that's the issue here. Any insights?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:56 AM

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ClearTheCode admin answer:

A whining or humming noise from the rear of an Acura RDX SH-AWD, especially at highway speeds and under acceleration, is a classic symptom of an issue with the rear differential. Given your vehicle's mileage, this is a very plausible concern.

  1. Rear Differential Fluid: The most common cause for this type of noise is low, old, or contaminated rear differential fluid. Acura's Super Handling All-Wheel Drive (SH-AWD) system is highly dependent on the specific DPSF-II fluid and its regular maintenance. Over time, this fluid breaks down and can lose its lubricating properties, leading to increased friction and noise.
  2. Fluid Change: If the fluid hasn't been changed recently (Acura typically recommends changes every 15,000 miles under severe conditions, or around 30,000 miles for normal driving for the rear differential), a fluid change using only genuine Acura DPSF-II fluid should be the first step. This often resolves minor whining noises by restoring proper lubrication and cooling.
  3. Worn Bearings: If a fluid change doesn't resolve the noise, or if the fluid was extremely dirty/metallic, it could indicate wear in the differential bearings. Bearings support the rotating components within the differential, and if they wear out, they can produce a distinct whine.
  4. SH-AWD Clutch Pack Issues: Less common, but issues with the SH-AWD clutch packs within the differential can also cause noise, though this often presents differently than a consistent whine.

Causes: Low or contaminated rear differential fluid, worn differential bearings, or, less commonly, issues with the SH-AWD clutch pack.

When to see a shop: A persistent whining noise from the differential is a strong indicator of internal wear or lubrication issues. Ignoring it can lead to catastrophic failure of the differential, which is a very expensive repair. Get it diagnosed by a qualified technician immediately, preferably one experienced with Acura's SH-AWD system. They can inspect the differential for excessive play, check for metal shavings in the fluid, and accurately determine the source of the noise to prevent further damage.

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