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2023 R1T "Reduced Power" Warning - Anyone else?

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Brian F. · rep 0 · May 22, 7:11 AM · 1 replies · solved · Question

Vehicle: 2023 Rivian R1T Adventure

Hey everyone,

I'm a new owner of a 2023 Rivian R1T Adventure, and I just hit a snag. While driving normally yesterday, I suddenly got a 'Reduced Power' warning message on the display, and I could definitely feel a noticeable drop in acceleration and overall performance.

It wasn't after heavy off-roading or anything strenuous, just regular city driving. I tried pulling over, turning it off and on again, but the warning persisted for a bit before disappearing, only to reappear later.

Has anyone experienced this with their R1T? What could be causing this? Is it a software glitch, a battery issue, or something more serious with the motors? Any advice on what to check or if this warrants an immediate service appointment would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 7:11 AM

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ClearTheCode admin answer:

A 'Reduced Power' warning in your 2023 Rivian R1T can be concerning, but it's often a protective measure by the vehicle's systems. Here's a breakdown of potential causes and what to do:

  1. Software Glitch: Modern EVs are heavily software-dependent. A temporary software anomaly can sometimes trigger false warnings or put the vehicle into a limp mode.

    • Action: Try a full vehicle restart (refer to your owner's manual for the proper procedure, which usually involves holding down specific steering wheel buttons). Ensure your Rivian's software is up to date.

  2. Battery Management System (BMS) Anomaly: The BMS monitors battery health, temperature, and cell balance. If it detects an issue (e.g., an unusual voltage drop in a cell, or thermal management issues), it might limit power to protect the battery pack.

    • Action: Monitor your charging behavior and range. If you notice unusual charging times or significant range degradation, it could point to a BMS issue.

  3. Motor Controller or Drivetrain Component Issue: While less common, problems with an electric motor, inverter, or other high-voltage drivetrain components can lead to power reduction. This could be due to overheating, sensor malfunction, or an internal fault.

    • Action: Pay attention to any unusual noises, vibrations, or smells accompanying the power reduction.

  4. Thermal Management: If the battery or motors are operating outside optimal temperature ranges (too hot or too cold), the system will reduce power to prevent damage.

    • Action: Note the ambient temperature and how long you've been driving when the warning appears.

When to See a Shop:

  • If the 'Reduced Power' warning is persistent, reappears frequently, or is accompanied by other warning lights (e.g., a 'Service Vehicle Soon' light) or noticeable performance degradation.
  • If you hear unusual noises from the drivetrain or experience any strange smells.
  • If a full vehicle restart does not clear the warning.

Rivian vehicles use proprietary diagnostic systems, so generic OBD-II scanners may not provide detailed fault codes for these specific EV issues. It's best to contact Rivian Service directly through your app or their support line. They can remotely diagnose many issues or schedule a service appointment if needed. Provide them with as much detail as possible about when and how the warning appeared.

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