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2022 R1T Drivetrain Malfunction - Limited Power Mode After Warning

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Mike T. · rep 0 · May 25, 5:03 AM · 1 replies · solved · Question

Vehicle: 2022 Rivian R1T Launch Edition

My 2022 Rivian R1T Launch Edition just threw a "Drivetrain Malfunction" warning on the main screen. It immediately went into limited power mode, and I could barely accelerate past 20 mph. It felt like the vehicle was heavily restricted.

There were no strange noises or vibrations, just a sudden loss of power and the warning light. I pulled over safely, turned the vehicle off, waited a few minutes, and turned it back on, but the warning persists. I'm worried about driving it. Has anyone experienced this with their R1T? What could be causing this sudden issue?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:03 AM

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ClearTheCode admin answer:

  1. Understand the Warning: A "Drivetrain Malfunction" in an EV like your Rivian R1T typically indicates an issue with the electric motors, inverter, high-voltage battery system, or associated control units. The vehicle enters a 'limp mode' to protect components and allow you to safely pull over.

  2. Potential Causes:

    • Motor Inverter Fault: Issues with the power electronics that convert DC battery power to AC for the motors.
    • Motor Sensor Failure: Problems with speed or temperature sensors on the electric motors.
    • High-Voltage Battery System Issue: A fault within the battery pack, battery management system (BMS), or high-voltage contactors.
    • Communication Errors: A breakdown in communication between critical control modules.
    • Specific DTCs (Diagnostic Trouble Codes): A capable OBD-II scanner (though specialized for EVs) would likely show codes in the P0Axx, P0Bxx, or P1xxx range related to EV drivetrain components.

  3. Initial Steps (Limited):

    • Restart Cycle: While you've done this, sometimes a longer power cycle (leaving it off for 30+ minutes, or even disconnecting the 12V battery for a few minutes if comfortable) can reset minor glitches. However, with a persistent drivetrain fault, this is unlikely to resolve a hardware issue.
    • Check for Recalls/Updates: Ensure your vehicle's software is up to date, though this is less likely to cause a sudden critical fault.

  4. When to See a Shop:

    • Immediately: A drivetrain malfunction that puts the vehicle into limp mode is a serious issue that requires immediate professional attention. Do not attempt to drive the vehicle long distances or at high speeds.
    • Contact Rivian Service: Given the complexity of EV drivetrains, this is not a DIY fix. You should contact Rivian service directly. They have specialized diagnostic tools and training to pinpoint the exact cause of the malfunction and perform necessary repairs or replacements. They may be able to diagnose remotely or arrange for a tow.
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