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Regenerative Braking System Warning Light on 2023 Polestar 2

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Mark S. · rep 0 · May 25, 5:22 AM · 1 replies · solved · Question

Vehicle: 2023 Polestar 2 Dual Motor

Hey everyone,

I've got a problem with my 2023 Polestar 2 Dual Motor. A few days ago, a warning light came on, indicating an issue with the regenerative braking system. I've also noticed that the car isn't regenerating as much power as it used to, and the braking feels a bit different, though still functional.

I ran my OBD scanner, and it pulled a couple of codes: P0571 and C0040. Has anyone else experienced this with their Polestar 2? What did it turn out to be, and how was it fixed? I'm concerned about driving it with this warning.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:22 AM

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ClearTheCode admin answer:

A warning light for the regenerative braking system on your 2023 Polestar 2, especially with associated OBD codes, is a critical issue that needs prompt attention. Reduced regenerative braking also indicates a system malfunction. Let's break down those codes and what they might mean:

  1. Understanding the OBD Codes:

    • P0571 - Cruise Control/Brake Switch 'A' Circuit Malfunction: This code typically indicates an issue with the brake pedal switch. This switch tells the car's computer when the brake pedal is pressed. If the car doesn't know you're pressing the brake, it can affect both regenerative braking (which needs to disengage when friction brakes are applied) and other systems like cruise control and even the stability control.
    • C0040 - Brake Fluid Pressure Sensor 'A' Circuit Malfunction: This code points to a problem with the brake fluid pressure sensor. This sensor is crucial for the ABS (Anti-lock Braking System) and ESC (Electronic Stability Control) systems, as it monitors the hydraulic pressure in the brake lines. A fault here can directly impact how the braking system, including regenerative braking, operates and integrates.

  2. Impact on Regenerative Braking:

    • Both a faulty brake switch and a pressure sensor can confuse the car's control modules regarding your braking intentions or the actual state of the hydraulic brake system. This can cause the car to limit or disable regenerative braking as a safety measure, ensuring that the friction brakes are always available and predictable.

  3. Potential Causes:

    • Faulty Brake Pedal Switch: The switch itself could be failing.
    • Wiring Issues: Damaged or corroded wiring/connectors to either the brake switch or the pressure sensor.
    • Sensor Failure: The brake fluid pressure sensor itself might be defective.
    • Software Glitch: Less common but possible, a software bug could be misinterpreting sensor readings.

  4. When to See a Shop:

    • Immediately. Given that these codes directly relate to critical braking system components, it is not safe to postpone diagnosis and repair. While your friction brakes may still be working, the integration of these systems is vital for safe and predictable vehicle operation.
    • Contact your Polestar service center right away. Do not attempt to clear the codes and continue driving extensively, as this could mask the problem or lead to more severe issues. A certified Polestar technician will have the specialized diagnostic tools to accurately pinpoint the root cause and perform the necessary repairs, which might involve replacing the faulty switch or sensor, or addressing wiring issues.
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