Why is my Acura MDX Type S transfer case making noise or failing?

Short answer: MDX Type S owners are reporting transfer-case failures with noise or loss of rear drive. Get fluid inspected and push for warranty coverage if you are still in the window.

Symptom: Rumble or growl from the transfer case, AWD feel gone, drivetrain warning, or a shop recommending transfer-case (and sometimes transmission) replacement.

What to check first

1. Note noises on accel, coast, or turns.
2. Ask the dealer to inspect transfer-case fluid for metal.
3. Confirm whether warranty or certified pre-owned coverage still applies.
4. Do not ignore a sudden loss of AWD feel.

Likely causes

1. Transfer case wear or failure. Type S owners report transfer-case noise, rumble, or loss of rear drive that ends in a transfer-case replacement.
2. Related transmission / driveline stress. Some owners replace both the transmission and transfer case when the shop finds both damaged.
3. Fluid neglect. Transfer-case fluid service matters on AWD Type S trucks. Ask what fluid spec and interval Acura lists for your VIN.

What it usually costs

Transfer-case replacement is a major repair. Warranty or CPO coverage is the difference between a free fix and a four-figure bill.

Is it safe to keep driving?

If the unit is failing, limited driving to the dealer is wiser than a long highway trip.

DIY or shop?

Shop only.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists 4 recall(s) for the Acura in these years, and none match this problem closely. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 109 keyword-matched complaints for Acura MDX 2022–2025 (of 364 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-06; keywords: transfer, case, awd, rumble, drivetrain, noise). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 99% Sure My MDX Type S Transfer Case is KAPUT on Reddit r/Acura, an owner was convinced the Type S transfer case had failed.
• In 2023 MDX Type S: Transmission and transfer case replacement at 110K KM on Reddit r/Acura, a 2023 Type S needed both units replaced around 69,000 miles.

Quick tip

Type S power through the transfer case is hard on that unit—noise plus metal in the fluid is not a 'drive it another year' problem.

Vehicle focus: Acura MDX Type S roughly 2022-2025.

Safety / mechanic note

Sudden loss of drive or a locked driveline is dangerous in traffic. Verify with a mechanic.