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Unusual Whining Noise During Regen Braking on 2022 R1T

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Chris P. · rep 0 · May 25, 5:07 AM · 1 replies · solved · Question

Vehicle: 2022 Rivian R1T Adventure

Hey everyone,

I've noticed a new, somewhat high-pitched whining noise coming from my 2022 Rivian R1T Adventure whenever I'm using strong regenerative braking, especially as I slow down below 20-25 MPH. It's not a grinding sound, more like an electric motor whine, but it seems louder than it used to be.

Is this normal for Rivians, or could it be an early sign of something needing attention? I've had the truck for about a year and a half, and I don't recall it being this prominent before. The truck drives fine otherwise, and there are no warning lights on the dash.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:07 AM

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ClearTheCode admin answer:

It's not uncommon for EVs, including Rivians, to produce various sounds during regenerative braking due to the electric motors acting as generators. However, a new or louder whine warrants investigation.

Here's what to consider:

  1. Normal Operation: Electric motors can produce a high-pitched whine, especially under load (like strong regen). The sound can vary with speed and regeneration intensity. If it's a consistent, smooth whine without any other symptoms, it might just be normal motor acoustics you're noticing more now.
  2. Brake Blending: Rivian's system seamlessly blends regenerative braking with friction brakes. A slight change in the friction brake pad engagement or rotor condition could contribute to a different sound profile during the regen phase where friction brakes might also be lightly engaged.
  3. Potential Issues:
    • Motor/Gearbox Wear: While less common on newer vehicles, internal wear in an electric motor or its associated gearbox could manifest as a new or louder whine. This would typically be accompanied by other symptoms like reduced performance or error codes.
    • Wheel Bearing: A failing wheel bearing can produce a humming or whining noise that changes with speed and load. However, this is usually constant and not solely tied to regen.
    • Loose Components: Sometimes, a loose shield or component near the drivetrain could vibrate and create noise under specific conditions.

When to see a shop:

  • If the noise is accompanied by any warning lights (e.g., related to the powertrain or brakes).
  • If you feel any unusual vibrations through the steering wheel or floorboard.
  • If the vehicle's performance or braking feel has changed.
  • If the whine becomes significantly louder, changes pitch erratically, or develops into a grinding sound.
  • If you have diagnostic tools, check for any pending or stored powertrain (P-codes) or braking system (C-codes) fault codes, though a subtle whine might not trigger one immediately.

It's always best to have a qualified Rivian service technician inspect the vehicle if you're concerned, especially since the sound is new. They can perform a diagnostic check and physically inspect the motor, braking system, and suspension components.

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