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Reduced Power and 'Vehicle May Not Restart' error on 2019 Model 3 Long Range

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

Vehicle: 2019 Tesla Model 3 Long Range

Hi all,

I'm having a really concerning issue with my 2019 Tesla Model 3 Long Range. While driving yesterday, I suddenly got a 'Reduced Power' warning on the screen, and the car felt like it went into limp mode. Acceleration was severely limited, and I also saw a message saying 'Vehicle May Not Restart' after I pulled over.

I managed to drive it home very slowly. It's got about 60,000 miles on it. I tried restarting the car, but the warnings persist, and the power is still limited. I'm worried it might be a major drivetrain component.

Has anyone experienced this specific combination of errors? What was the fix? Any insights would be helpful.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

The 'Reduced Power' and 'Vehicle May Not Restart' warnings on your 2019 Tesla Model 3 Long Range are serious alerts that indicate a critical issue with the vehicle's powertrain or high-voltage system. This is not something to ignore, as it can lead to complete immobilization of the vehicle.

Here's a breakdown of potential causes and the necessary steps:

  1. Understand the Severity: These warnings imply a fault that affects the car's ability to safely operate or even power on. The 'Vehicle May Not Restart' message is a direct instruction not to turn off the car unless absolutely necessary, as it might not come back on.

  2. Potential Causes:

    • Battery Management System (BMS) Fault: The BMS monitors the health, temperature, and voltage of the battery cells. A fault here can trigger power limitations to protect the battery, or due to an inability to accurately report battery status.
    • Drive Unit Inverter/Motor Controller Issue: The inverter converts DC power from the battery to AC power for the motor. A malfunction in this component or the motor controller can directly lead to reduced power.
    • High Voltage Contactor Fault: These contactors connect and disconnect the high-voltage battery from the rest of the vehicle's systems. If one fails to close or open correctly, power delivery is compromised.
    • Thermal Management System Failure: Overheating of the battery or drive unit due to a cooling system fault can force the car into limp mode to prevent damage.
    • Internal Diagnostic Codes: Your vehicle has likely logged critical codes such as BMS_f001 (BMS Fault), P_INV_002 (Inverter Fault), or HV_CON_003 (High Voltage Contactor Issue).

  3. When to See a Shop:

    • Immediately – Do Not Drive: Given the 'Vehicle May Not Restart' warning, do not attempt to drive the car further. Continuing to operate the vehicle could cause more extensive damage or leave you stranded in an unsafe location.
    • Contact Tesla Roadside Assistance: Your first step should be to contact Tesla Roadside Assistance to have the vehicle towed to the nearest Tesla Service Center. They are equipped to handle these high-voltage issues safely and effectively.

This type of issue requires specialized diagnostic equipment and trained technicians to identify and repair. Attempting DIY fixes or ignoring these warnings is strongly discouraged due to the high-voltage components involved.

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