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Unusual Whining/Humming from Drive Unit on 2024 R1T

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Mike T. · rep 0 · May 25, 5:05 AM · 1 replies · solved · Question

Vehicle: 2024 Rivian R1T Quad-Motor

Hey community, I've noticed a new and concerning noise coming from my 2024 Rivian R1T Quad-Motor. It's a distinct whining or humming sound that seems to originate from the front drive unit, especially noticeable between 20-40 mph and under light acceleration or deceleration. It's not a constant noise, but it's definitely present and wasn't there when I first got the truck a few months ago.

My R1T only has about 7,000 miles on it. I'm wondering if this is normal 'EV whine' that I'm just now noticing, or if it indicates a potential issue with the gears or bearings in the drive unit. I've had other EVs, and this sound feels a bit different – more mechanical and less like the typical motor hum.

Has anyone else with a newer R1T experienced similar sounds? What was the diagnosis? I'm debating whether to schedule a service appointment right away or monitor it for a bit. Any advice on identifying the source or what it might mean would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:05 AM

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ClearTheCode admin answer:

An unusual whining or humming sound from the drive unit of your 2024 Rivian R1T, especially when it's a new development, warrants attention. While EVs do have a characteristic 'whine' from their electric motors, a new or distinct mechanical sound could indicate an emerging issue. Here's what to consider:

  1. Distinguishing Sounds: It's important to differentiate between normal EV motor harmonics and abnormal mechanical noises. Normal EV whine is typically a higher-pitched, consistent hum that changes with motor RPM. A new, lower-pitched whine, grinding, or groaning sound often suggests a mechanical problem.
  2. Common Causes for Drive Unit Noise:
    • Bearing Wear: The bearings within the electric motor or the reduction gearbox (which transfers power to the wheels) can wear out, leading to whining, humming, or grinding noises. This is a common cause of such sounds.
    • Gear Wear/Damage: The gears within the drive unit's reduction gearbox can develop wear patterns, pitting, or even chipping, which can manifest as distinct noises, especially under specific load conditions.
    • Lubrication Issues: Insufficient or degraded lubrication within the drive unit can lead to increased friction and noise. While less common in newer vehicles, it's a possibility.
    • Motor Rotor/Stator Issues: Less frequently, issues with the electric motor's internal components (e.g., rotor unbalance, stator coil issues) can create vibrations and noise.
    • Mounting Issues: A loose or failing motor mount could transmit vibrations or sounds more prominently into the cabin.
  3. Diagnostics: While there might not be a specific OBD code for 'drive unit whine' unless a sensor detects an anomaly (e.g., excessive vibration or temperature), a technician will perform a road test to replicate the sound and may use a chassis ear or stethoscope to pinpoint the source. They will also inspect for leaks, play in the axles, and potentially check the drive unit fluid (if applicable).
  4. When to See a Shop: Given that this is a new sound and you're concerned it's not normal EV whine, it's advisable to schedule a service appointment with Rivian. Early detection of bearing or gear wear can prevent more extensive and costly damage to the entire drive unit. Continue to monitor the sound for changes in intensity or character, and report all observations to the service technician.
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