2023 R1T "Drivetrain Malfunction" and Reduced Power

ClearTheCode guidance (Rivian · Engine & drivetrain)

Summary: For 2023 R1T "Drivetrain Malfunction" and Reduced Power, work through these steps on your 2015+ vehicle:

1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
5. Test the common fix — follow model-specific service procedures; one change at a time.
6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: My 2023 Rivian R1T Quad-Motor, with about 15k miles, recently started showing a "Drivetrain Malfunction" warning on the dash.

It feels like the power is significantly reduced, especially when accelerating quickly. I've tried restarting the vehicle, but the warning comes back.

No strange noises, just less oomph. Is this a common issue? What should I check?

This is educational guidance, not a substitute for hands-on diagnosis.