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2021 Model Y Regenerative Braking Feels Weak & Front Clunking Noise

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Mike T. · rep 0 · May 25, 4:01 AM · 1 replies · solved · Question

Vehicle: 2021 Tesla Model Y Long Range

Hi everyone,

I've got a 2021 Tesla Model Y Long Range, and recently I've noticed a change in its regenerative braking. It feels significantly weaker than it used to, almost like it's not slowing the car down as much as before. This is particularly noticeable when I lift off the accelerator.

On top of that, I've started hearing an occasional clunking noise, seemingly from the front of the car, especially when going over small bumps or sometimes even during light braking. I'm wondering if these two issues could be related, or if I'm dealing with separate problems.

Has anyone else experienced a similar combination of symptoms with their Model Y? Any thoughts on what might be causing this?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:01 AM

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ClearTheCode admin answer:

Weakened regenerative braking combined with a clunking noise from the front of your 2021 Tesla Model Y can indicate a few different issues, some of which might be related.

Common Causes:

  1. Temperature/Battery State of Charge (SoC): Regenerative braking is naturally limited when the battery is cold (especially in colder weather) or when it's near 100% charge. In these scenarios, the car has less capacity to accept regenerated energy. Check your battery icon on the display for a dashed line indicating limited regen.
  2. Brake System Intervention: If the friction brakes are engaging more than usual due to a perceived issue or calibration, it can feel like regen is weaker. However, the clunking suggests a mechanical issue.
  3. Suspension Components (Clunking): The clunking noise is more likely related to front suspension components. Common culprits include:
    • Control Arm Bushings: Worn or failing bushings in the front upper or lower control arms are a very common source of clunking noises over bumps and during braking/acceleration in Teslas.
    • Sway Bar Links/Bushings: Loose or worn sway bar end links or bushings can also produce clunking sounds.
    • Ball Joints: Worn ball joints can cause similar noises and affect handling.
    • Damaged Strut Mounts: The mounting points for the front struts can wear out, leading to noise.
  4. Brake Caliper Issues (Less Likely for Clunking, More for Feel): A sticking brake caliper could cause a clunk and might subtly affect the feel of braking, but it's less likely to directly cause weakened regen unless it's a severe system fault.

What You Can Do:

  1. Check Battery Status: Confirm your battery temperature and state of charge. If the battery is cold or full, the reduced regen is normal.
  2. Inspect Suspension Visually: If safe, visually inspect the front suspension components for any obvious signs of wear, cracks in rubber bushings, or loose parts. Listen carefully for the clunking to try and pinpoint its origin.
  3. Check for Diagnostic Trouble Codes (DTCs): While a clunking noise might not trigger a DTC directly, if there's an underlying issue affecting the braking system or a sensor, it might. A Tesla service center can pull any relevant codes.

When to See a Shop:

  • Immediately: If the clunking noise is severe, constant, or accompanied by any changes in steering or stability. Worn suspension components can compromise handling and safety.
  • If the weakened regenerative braking persists even when the battery is warm and not fully charged.
  • If you notice any warning lights on your dashboard related to the braking or suspension system.
  • Any time you hear persistent mechanical noises from the suspension. Addressing worn suspension components early can prevent more extensive and costly repairs down the line.

A Tesla Service Center will be able to diagnose both the regenerative braking performance (checking software, battery health, and sensor readings) and the source of the clunking noise by inspecting the suspension components thoroughly.

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