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2023 R1T - Sudden Reduced Power Warning and Drivetrain Malfunction

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David L. · rep 0 · May 22, 7:07 AM · 1 replies · solved · Question

Vehicle: 2023 Rivian R1T Launch Edition

Hey everyone,

I'm an owner of a 2023 Rivian R1T Launch Edition, and I recently ran into a pretty concerning issue. While driving on the highway, I suddenly got a 'Reduced Power' warning on the dash, followed by a 'Drivetrain Malfunction' message. The truck immediately lost significant power, and I had to pull over.

After restarting, the warnings were still there, and the power was severely limited, almost like a limp mode. I managed to get it home, but I'm hesitant to drive it again. Has anyone else experienced this with their R1T, especially a 2023 model? What was the cause, and how was it resolved?

I'm planning to contact Rivian service, but I wanted to see if this is a known issue or if there are any immediate troubleshooting steps I could try. Any insights would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 7:07 AM

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ClearTheCode admin answer:

Experiencing a 'Reduced Power' and 'Drivetrain Malfunction' warning in your 2023 Rivian R1T is a serious issue that indicates a problem within the high-voltage powertrain system. Given the nature of electric vehicles, these warnings often point to critical components. Here's a breakdown of potential causes and what to do:

  1. Potential Causes:

    • Drive Unit Fault: Each Rivian R1T has multiple electric drive units. A fault in one of these motors or its associated inverter (which converts DC battery power to AC for the motor) can trigger these warnings. This could be due to a sensor failure, overheating, or an internal component malfunction.
    • High-Voltage Battery System Issue: Problems with the high-voltage battery pack, its contactors, or the Battery Management System (BMS) can restrict power delivery. While less common for a sudden event, a BMS error could incorrectly report an issue or genuinely detect a problem.
    • Power Electronics Module (PEM) or Inverter Failure: The PEM manages power flow and conversion. A fault here can directly impact the vehicle's ability to deliver power to the motors.
    • Wiring or Connector Issues: Loose or corroded high-voltage wiring or connectors within the drivetrain can interrupt power or signal flow, leading to these warnings.
    • Software Glitch: In some rare cases, a software anomaly could trigger false warnings, though this is usually accompanied by other erratic behavior.
    • Diagnostic Trouble Codes (DTCs): When these warnings appear, the vehicle's onboard diagnostics system will store specific codes. Common EV powertrain codes might include P0AXX (related to hybrid/EV battery), P0BXX (high voltage system), or manufacturer-specific codes indicating a drive unit or inverter fault. Without reading these codes, pinpointing the exact issue is difficult.

  2. When to See a Shop (Rivian Service):

    • Immediately. A 'Reduced Power' and 'Drivetrain Malfunction' warning is not something to ignore or attempt to fix yourself. This is a critical safety and performance issue.
    • Do not continue driving the vehicle if the warnings persist or if you experience further power loss. The 'limp mode' is designed to protect the vehicle from further damage, but it's not a solution for continued use.
    • Contact Rivian Service: Your Rivian R1T is under warranty, and this type of issue requires specialized diagnostic tools and expertise. Contact Rivian's roadside assistance or schedule a service appointment immediately. They can remotely access some vehicle data and will need to physically inspect the vehicle and read the specific diagnostic trouble codes to determine the root cause.
    • Avoid DIY Repairs: Due to the high-voltage nature of EV powertrains, attempting repairs without proper training and equipment is extremely dangerous and can lead to severe injury or further damage to the vehicle.
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