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Unusual Noise During Regenerative Braking on Polestar 2

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David L. · rep 0 · May 22, 7:43 AM · 1 replies · solved · Question

Vehicle: 2022 Polestar 2 Long Range Dual Motor

Hey everyone, I've had my 2022 Polestar 2 Long Range Dual Motor for about a year now, and lately, I've noticed a new sound when the regenerative braking kicks in, especially at lower speeds. It's almost like a light grinding or sometimes a faint squeal.

It's not constant, but definitely noticeable when I lift off the accelerator and the car starts to slow down using regen. I usually drive with the 'Standard' regen setting.

Is this normal for Polestars, or should I be concerned? I haven't noticed any change in braking performance, but the sound is new. Any similar experiences or advice would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 7:43 AM

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ClearTheCode admin answer:

  1. Understanding Regenerative Braking Noise: The Polestar 2's regenerative braking system seamlessly blends electric motor deceleration with traditional friction brakes. It's common to hear some subtle noises, especially at lower speeds (typically under 10-15 mph) as the friction brakes engage to bring the car to a complete stop or supplement regen. A light grinding can sometimes be the brake pads lightly contacting the rotors, which is often normal.

  2. Potential Causes for Increased Noise:

    • Normal Wear: Brake pads and rotors naturally wear over time, and this can sometimes change the sound profile. Slight surface imperfections can cause minor noises.
    • Surface Rust: If the car sits for a while, a thin layer of rust can form on the rotors. This often causes a grinding sound that usually disappears after a few braking applications.
    • Pad Glazing: If the pads get too hot or are used very gently for extended periods (common with strong regen), they can glaze, leading to squealing.
    • Sticking Calipers: Less common, but a caliper not fully releasing can cause continuous friction and noise. This would typically be more consistent.
    • Debris: Small stones or road debris caught between the pad and rotor can cause significant grinding or scraping sounds.

  3. When to See a Shop:

    • If the grinding/squealing is loud, persistent, or accompanied by a vibration in the pedal or steering wheel.
    • If you notice a significant change in braking performance or feel, such as reduced stopping power or a spongy pedal.
    • If the noise occurs consistently at higher speeds, not just during low-speed regen engagement.
    • If any warning lights appear on your dashboard (e.g., brake system warning, ABS light).

  4. Diagnostics: While there isn't a specific OBD code for "regen braking noise" itself, a professional technician can inspect the brake system for:

    • Pad thickness and wear patterns.
    • Rotor condition (runout, scoring, rust).
    • Caliper function and piston movement.
    • Brake fluid level and condition.
    • Check for any fault codes related to the braking system (e.g., C0000 series codes for ABS/Traction Control if there's a system malfunction affecting the blend of braking).

It's always best to have a qualified Polestar service center inspect your vehicle if you're concerned about unusual noises, as brake system integrity is crucial for safety.

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