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2024 R1T Drivetrain Malfunction - Limp Mode Engaged!

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Chris P. · rep 0 · May 25, 5:03 AM · 1 replies · solved · Question

Vehicle: 2024 Rivian R1T Quad-Motor

My 2024 Rivian R1T just threw a 'Drivetrain Malfunction' error and immediately went into limp mode. I was driving on the highway, and suddenly power dropped significantly. The maximum speed was limited, and acceleration was almost non-existent. I managed to limp it to the nearest exit and pull over.

I tried restarting the vehicle, but the error persists, and it's still in limp mode. There were no strange noises or prior warnings. The truck has only about 8,000 miles on it. This is really frustrating for such a new vehicle.

Has anyone experienced a similar 'Drivetrain Malfunction' with their R1T or R1S? What was the underlying cause? I'm worried this is a major issue.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

A 'Drivetrain Malfunction' causing your 2024 Rivian R1T to enter limp mode is a serious issue indicating a critical problem with the electric propulsion system. Limp mode is a protective measure to prevent further damage.

Possible Causes:

  1. Motor Inverter/Controller Failure: Each motor has an inverter that converts DC battery power to AC power for the motors. A fault in an inverter or its control unit can cause a drivetrain malfunction. This is a common point of failure in EVs.
  2. Electric Motor Fault: While less common in newer vehicles, an internal fault within one of the electric motors (e.g., winding issue, sensor failure) can trigger this error. With a quad-motor setup, a fault in one motor could still trigger a system-wide limp mode.
  3. High Voltage Battery System Issue: Problems with the main high-voltage battery pack, such as a contactor failure, an internal short, or a significant voltage imbalance, can disrupt power delivery to the motors and trigger drivetrain warnings. OBD-II codes like P0A0F (Engine Not Starting) or P0A0B (High Voltage System Interlock Circuit Performance) are indicative of HV system issues.
  4. High Voltage Cabling/Connector Problem: Damage or a loose connection in the high-voltage cabling between the battery, inverters, and motors could interrupt power flow.
  5. Temperature Sensor Malfunction: Overheating of a motor, inverter, or battery pack, or a faulty sensor reporting incorrect temperatures, can cause the system to enter limp mode to prevent damage.

Recommended Steps:

  1. Do Not Drive: Continuing to drive in limp mode could worsen the problem or potentially lead to a complete breakdown. It's best to have the vehicle towed.
  2. Contact Rivian Service Immediately: This type of error requires specialized diagnostic equipment and expertise. Rivian service technicians can read the specific fault codes and perform detailed diagnostics to pinpoint the exact component causing the issue.

When to See a Shop:

Immediately. A 'Drivetrain Malfunction' and limp mode are clear indicators that your Rivian needs professional attention. Do not attempt to reset or clear the codes yourself, as this could mask the underlying problem. Schedule a service appointment or arrange for a tow to a Rivian Service Center as soon as possible.

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