The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

Grinding Noise During Regenerative Braking on 2022 Outlander PHEV

0

Mike T. · rep 0 · May 22, 5:32 AM · 1 replies · solved · Question

Vehicle: 2022 Mitsubishi Outlander PHEV SEL

Hello everyone,

I've noticed a concerning grinding noise coming from my 2022 Mitsubishi Outlander PHEV SEL. It specifically happens when the regenerative braking system engages, especially at lower speeds or when coming to a stop. It's not a constant noise, but it's definitely there when the regen kicks in.

I've had the car for about a year, and this is a new development. The regular friction brakes seem to work fine, and there's no grinding when I press the pedal hard. It's only during the regenerative braking phase. Could this be an issue with the electric motors, or perhaps something related to the blend between regen and friction braking?

Has anyone with an Outlander PHEV experienced anything similar? What could be causing this, and is it something I should be seriously worried about?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:32 AM

0

ClearTheCode admin answer:

A grinding noise specifically during regenerative braking on your 2022 Mitsubishi Outlander PHEV SEL is a concerning symptom that warrants immediate investigation. While regenerative braking uses the electric motors to slow the vehicle and recharge the battery, it also works in conjunction with the conventional friction brakes, especially as the vehicle comes to a complete stop or when more braking force is required.

Here are potential causes and considerations:

  1. Brake Pad/Rotor Issues: Even though you mentioned the friction brakes seem fine, the blending of regenerative and friction braking means the conventional pads and rotors are still actively used. If brake pads are severely worn, or if there's rust or debris on the rotors, a grinding noise can occur, especially when the friction brakes are lightly engaged during the regen blend.
  2. Brake Caliper Issues: A sticking or seized brake caliper can cause a pad to drag on the rotor, leading to grinding. This might be more noticeable during the transition phases of braking.
  3. Wheel Bearings: A failing wheel bearing can produce a grinding or humming noise that changes with vehicle speed and sometimes with load (like braking). While not directly related to regen, it's a possibility if the noise is speed-dependent.
  4. Electric Motor/Generator Issues: In rare cases, an internal issue with the electric motors or their associated components (e.g., bearings, gears) could manifest as a grinding noise during their operation, which is most prominent during regenerative braking. This would likely trigger specific powertrain or hybrid system diagnostic codes.
  5. Loose Components/Debris: Sometimes, a small stone or piece of debris can get lodged between the brake rotor and caliper, causing a grinding sound. This is usually intermittent.

When to See a Shop: It is crucial to have your Outlander PHEV inspected by a Mitsubishi-certified technician or a shop experienced with hybrid/PHEV systems as soon as possible. Do not ignore grinding noises related to braking. A professional will:

  • Perform a thorough inspection of the brake system (pads, rotors, calipers).
  • Check for any diagnostic trouble codes (DTCs) related to the hybrid system, electric motors, or braking system.
  • Evaluate the wheel bearings and other suspension components.
  • Test drive the vehicle to replicate the noise and determine its exact source.

Addressing this promptly will prevent potential further damage and ensure your vehicle's braking system operates safely and efficiently.

Menu

Help & account