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2023 R1T: Propulsion System Malfunction and Reduced Power Mode

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Jennifer H. · rep 0 · May 22, 8:21 AM · 1 replies · solved · Question

Vehicle: 2023 Rivian R1T Launch Edition

Hey everyone, I'm having a serious issue with my 2023 Rivian R1T Launch Edition. Yesterday, while driving home, I suddenly got a 'Propulsion System Malfunction' warning on the dash, and the truck immediately went into a reduced power mode. It felt like it lost a lot of its acceleration capability.

I managed to get it home, but now I'm worried about driving it. I haven't tried charging it since, but it was at about 60% charge when this happened. No strange noises or smells, just the warning and the power reduction.

Has anyone else experienced this with their R1T? What could be causing this, and is there anything I can check before calling service? I'm hoping it's not something major.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 8:21 AM

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ClearTheCode admin answer: A 'Propulsion System Malfunction' warning on your 2023 Rivian R1T indicates a critical issue within the vehicle's high-voltage or drivetrain systems. This often triggers a 'limp mode' to protect components and ensure safety. Here's what you should consider:

  1. Check the 12V Auxiliary Battery: While often overlooked in EVs, a weak or failing 12V battery can cause a cascade of seemingly unrelated electrical errors, including propulsion warnings, as it powers many control modules. You can test its voltage, but a professional diagnostic is usually needed to confirm if it's the root cause.

  2. Scan for Diagnostic Trouble Codes (DTCs): Using an OBD-II scanner capable of reading EV-specific codes is crucial. While generic P-codes (e.g., P0AXX series related to drive motor or battery management) might appear, Rivian will also have manufacturer-specific codes (e.g., U-codes for communication issues, B-codes for body systems, or specific P-codes) that pinpoint the exact subsystem or component at fault. Common codes associated with propulsion issues include those related to:

    • High-voltage battery contactors
    • Inverter or motor control unit faults
    • Drive unit sensor failures
    • Battery Management System (BMS) errors

  3. Common Causes for Propulsion System Malfunction in EVs:

    • High Voltage Battery System Issues: Problems with the battery pack itself, individual cell modules, contactors, or the BMS.
    • Inverter/Motor Control Unit (MCU) Faults: The inverter converts DC battery power to AC for the electric motors. Any fault here directly impacts propulsion.
    • Electric Motor Issues: While less common, issues with the electric motors themselves or their associated sensors can trigger this warning.
    • High Voltage Wiring or Connector Problems: Loose, corroded, or damaged high-voltage cables and connectors.
    • Thermal Management System: Overheating of the battery or motors can lead to power reduction and warnings.

  4. When to See a Shop: A 'Propulsion System Malfunction' is a serious warning that should not be ignored. Due to the complexity and high voltage components involved, it is strongly recommended to have your Rivian R1T inspected by a certified Rivian service center or a qualified EV technician immediately. Attempting DIY repairs on high-voltage systems without proper training, tools, and safety equipment is extremely dangerous and can lead to severe injury or further damage to the vehicle. Provide the service center with any OBD-II codes you've pulled, as this will significantly aid in their diagnosis.

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