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2022 Model Y Performance - Intermittent Power Limiting & Warning Message

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Mike T. · rep 0 · May 25, 4:00 AM · 1 replies · solved · Question

Vehicle: 2022 Tesla Model Y Performance

I've got a 2022 Tesla Model Y Performance, and recently I've been getting an intermittent warning message on the screen that says 'Power Limited' or 'Reduced Performance'. It usually happens when I'm accelerating hard or sometimes just randomly during a drive. The car definitely feels like it loses some power when this message pops up.

It doesn't stay on for long, maybe a minute or two, and then the car returns to normal. There are no other warning lights, and it's not tied to extreme weather conditions or low battery charge. I've tried rebooting the screen, but it still happens.

Could this be an issue with the motor, inverter, or maybe the high-voltage battery system? It's pretty frustrating on a performance model. Any ideas on what might be causing this?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:00 AM

0

ClearTheCode admin answer:

  1. Initial Assessment: Intermittent 'Power Limited' or 'Reduced Performance' warnings, especially during hard acceleration, on a 2022 Tesla Model Y Performance strongly suggest an issue within the high-voltage power delivery system or one of the drive units. This is not normal operation and requires prompt attention.

  2. Common Causes:

    • Inverter/Contactor Issues: The inverter (or power electronics controller) converts DC battery power to AC for the motors. A fault here, or with the high-voltage contactors that connect the battery to the system, can cause power limitations. Overheating or component degradation can trigger these warnings.
    • Battery Pack Thermal Management: While you mentioned it's not tied to extreme weather, an internal issue with the battery's thermal management system (e.g., a faulty sensor or coolant pump) could cause the battery to limit power to prevent overheating or overcooling.
    • Motor Sensor Malfunction: A faulty motor sensor could send incorrect data to the vehicle's computer, leading it to believe there's an issue and limit power as a protective measure.
    • High-Voltage Cable/Connection Issues: Loose or corroded high-voltage connections, though less common on newer vehicles, could cause intermittent resistance and power delivery problems.
    • Software Bug: While less likely to cause intermittent hardware-like symptoms, a software anomaly could potentially trigger erroneous warnings. However, given the actual power reduction, it points more towards a hardware-related issue.

  3. DIY Checks (Limited):

    • Note Conditions: Pay attention to when exactly it happens (e.g., specific speeds, acceleration force, battery state of charge). This information will be valuable for the service technicians.
    • Firmware Update: Ensure your vehicle's software is fully up to date. Sometimes, known issues are resolved with new firmware.
    • Visual Inspection: Briefly check for any obvious signs of damage or loose connections around the drive units (though high-voltage components are usually sealed).

  4. When to See a Shop:

    • Immediately: Any persistent 'Power Limited' or 'Reduced Performance' warnings, especially if they affect vehicle safety or driving confidence, should prompt an immediate service appointment. Driving with a potentially compromised high-voltage system could lead to further damage or even leave you stranded.

  5. Diagnostics at a Service Center: Tesla technicians will:

    • Connect to the vehicle's diagnostic system to retrieve specific Tesla error codes. Common codes for this type of issue might include DRV_a004 (drive unit power limited), BMS_f001 (high voltage system fault), or PFC_w031 (power electronics controller warning).
    • Perform live data monitoring to observe battery, motor, and inverter performance during simulated driving conditions.
    • Inspect high-voltage components, including the inverter, contactors, and battery connections, for any signs of fault or degradation. They may also check coolant levels and pump operation for the battery thermal management system.
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