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QX60 AWD Warning Light & Rough Shifting – Transfer Case Fluid?

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Mike T. · rep 0 · May 25, 3:50 AM · 1 replies · solved · Question

Vehicle: 2020 Infiniti QX60 Luxe

Hi everyone,

My 2020 Infiniti QX60 Luxe, with about 55,000 miles, recently threw an 'AWD Malfunction' warning light on the dash. I also feel like the car is shifting a bit rougher than usual, especially when accelerating from a stop, and sometimes there's a slight clunk when engaging drive or reverse.

I've heard that the transfer case fluid can be overlooked. Could this be related to the AWD warning or the shifting issues? What's the recommended service interval for the transfer case fluid on these QX60s? Is this something I can check or replace myself?

Any insights would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:50 AM

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Hi Sarah P.,

An 'AWD Malfunction' warning light on your 2020 Infiniti QX60 Luxe, coupled with rough shifting, definitely warrants attention. While the transmission fluid is often the first suspect for shifting issues, the transfer case fluid is indeed a critical component of your AWD system and can sometimes be overlooked during routine maintenance.

Here's a breakdown:

  1. Transfer Case Function: The transfer case distributes power from the transmission to both the front and rear axles in an AWD vehicle. Its fluid lubricates the gears and bearings within the unit. Over time, this fluid can break down, leading to increased friction, wear, and potential issues.
  2. Symptoms of Bad Fluid: Old or low transfer case fluid can cause:
    • Whining or grinding noises from the drivetrain.
    • Difficulty engaging AWD or erratic AWD performance.
    • The 'AWD Malfunction' warning light, as sensors might detect abnormal operation or slippage.
    • Though less common, it can indirectly affect the perceived smoothness of power delivery, which might feel like rough shifting.
  3. Service Interval: For your QX60, Infiniti typically recommends inspecting the transfer case fluid every 30,000 miles or 24 months, and replacing it every 60,000 miles or 48 months, especially under severe driving conditions (towing, dusty roads, frequent short trips, or aggressive driving). At 55,000 miles, it's definitely due for inspection and likely replacement.
  4. Fluid Type: It's crucial to use the correct Nissan Genuine Transfer Case Fluid (Matic D or equivalent) as specified in your owner's manual. Using the wrong type can cause damage.
  5. DIY vs. Shop: Checking and replacing transfer case fluid is generally a straightforward DIY task for someone with basic mechanical skills and tools. It involves locating the drain and fill plugs, draining the old fluid, and refilling with new fluid until it overflows from the fill hole. However, given the 'AWD Malfunction' light, it's highly recommended to have a professional shop diagnose the issue. They can read specific diagnostic trouble codes (DTCs) related to the AWD system (e.g., C1101, C1102 for sensor issues, or P17XX codes for transfer case control) and rule out other potential problems like sensor failures or electrical issues before just changing the fluid.

When to See a Shop:

  • Immediately, due to the 'AWD Malfunction' warning light. This indicates a system fault that needs proper diagnosis.
  • If you're not comfortable working under the car or aren't sure about the correct fluid level procedure.
  • If the issue persists after a fluid change, indicating a deeper problem with the transfer case or AWD control module.
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