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Strange grinding noise during regenerative braking on 2020 Pacifica Hybrid

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Mike T. · rep 0 · May 25, 4:23 AM · 1 replies · solved · Question

Vehicle: 2020 Chrysler Pacifica Hybrid Limited

Hi everyone,

I own a 2020 Chrysler Pacifica Hybrid Limited, and I've started noticing a strange grinding or scraping noise specifically when the regenerative braking kicks in. It's not the normal brake pad noise, and it doesn't happen when I use the friction brakes aggressively. It's most noticeable when I'm slowly coming to a stop and the regen braking is actively slowing the vehicle down.

It's a bit unsettling, and I'm worried about the hybrid system or the brakes themselves. Has anyone with a Pacifica Hybrid experienced this? Is this a known issue, or could it be something serious? No warning lights are on the dash, thankfully.

Any thoughts or similar experiences would be helpful!

Thanks, David

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:23 AM

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ClearTheCode admin answer:

A grinding or scraping noise during regenerative braking on your 2020 Chrysler Pacifica Hybrid is a concern that warrants investigation, even without warning lights. Regenerative braking uses the electric motor to slow the vehicle and recharge the battery, so the friction brakes are often used less, which can lead to unique issues.

Here are potential causes and what to consider:

  1. Brake Pad Glazing/Rust: Because friction brakes are used less frequently in hybrids, the pads can sometimes glaze over or develop a thin layer of rust, especially if the vehicle sits for periods. When the friction brakes do engage (even lightly, as regen braking blends with friction braking), this can cause noise. This is often more of a squeal or groan, but can manifest as a light grind.
  2. Worn or Seized Caliper Pins: If the caliper pins are not properly lubricated or are seized, the brake pads may not move freely, leading to uneven wear and noise when the friction brakes are called upon, even subtly.
  3. Wheel Bearing Issues: A failing wheel bearing can produce a grinding or humming noise that changes with vehicle speed or when load shifts (like during braking), and it might be more noticeable during the deceleration phase of regenerative braking.
  4. Brake Shield Contact: A bent or rusted brake dust shield can sometimes rub against the rotor, creating a scraping noise. This is usually more consistent but can be exacerbated by the subtle changes in load during braking.
  5. Hybrid System Component Noise (Less Common): While rare, a fault within the electric motor or transmission components involved in regenerative braking could theoretically produce an unusual noise. However, this would typically trigger a check engine or hybrid system warning light.

When to see a shop:

  • Safety First: Any unusual brake noise should be inspected by a professional. While regenerative braking is distinct, the ultimate stopping power relies on the friction brakes, and any issue there is a safety concern.
  • Professional Inspection: A technician specializing in hybrids can properly diagnose this. They will inspect the brake pads, rotors, calipers, and wheel bearings. They can also check for any specific diagnostic codes related to the hybrid braking system, even if no dashboard lights are illuminated (e.g., C0034 - Left Rear Wheel Speed Sensor, if it's affecting sensor readings during braking).
  • Brake Service: Often, a simple brake service (cleaning, lubricating caliper pins, and inspecting pads/rotors) can resolve noises related to underutilization of friction brakes in hybrids.
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