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2023 R1T - Reduced Power and "Service Required" Message After Charging

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

Vehicle: 2023 Rivian R1T Adventure

Hey everyone,

I'm experiencing a concerning issue with my 2023 Rivian R1T Adventure. After unplugging from a Level 2 charger this morning, I immediately got a "Service Required" message on the dash, and the truck felt like it was in a reduced power mode. It's noticeably slower to accelerate, and I'm worried about driving it much.

Has anyone else encountered this problem? I haven't seen any specific OBD-II codes pop up on my basic scanner, but the warning is persistent. I tried restarting the vehicle a couple of times, but the message remains.

Could this be related to the charging system, or is it something more serious with the propulsion system? Any advice on what to check or if this is a known bug would be greatly appreciated before I schedule a service appointment.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

Experiencing a "Service Required" message with reduced power in your 2023 Rivian R1T after charging is a critical issue that warrants immediate attention. While your basic scanner might not show specific Rivian-proprietary codes, the vehicle's internal diagnostics have detected a fault.

Here's a breakdown of potential causes and recommended actions:

  1. High Voltage System Faults: This is the most common reason for reduced power and service messages in EVs. Issues can arise from:

    • Battery Management System (BMS): A sensor or module within the BMS might be reporting an anomaly, leading the system to limit power to protect the battery pack.
    • High Voltage Contactors: These are switches that connect and disconnect the high-voltage battery from the rest of the vehicle's propulsion system. A fault here can prevent full power delivery.
    • Inverter/Motor Controller: Problems with the power electronics that convert DC battery power to AC for the motors can trigger these warnings.
    • Charging System Interlock: Though less common, a fault in the charging port or its communication with the vehicle's systems could persist after unplugging, causing a system-wide alert.

  2. Diagnostic Codes: While your scanner might not show them, Rivian's diagnostic tools would likely reveal specific codes (e.g., P0Axx series for EV systems, or manufacturer-specific codes) pointing to the exact subsystem at fault.

  3. What to do:

    • Do Not Ignore: Continuing to drive with a "Service Required" message and reduced power can potentially exacerbate the issue or lead to further damage.
    • Check 12V Battery: Although less likely to cause reduced propulsion power directly, a weak 12V auxiliary battery can sometimes cause a cascade of electronic issues and false warnings. You can check its voltage if you have a multimeter.
    • Attempt a Full Power Cycle (Soft Reset): Sometimes, a complete shutdown and restart can clear transient electronic glitches. Consult your owner's manual for the correct procedure to fully power down and restart your Rivian.
    • Contact Rivian Service Immediately: This type of warning almost always requires professional diagnosis and repair. Rivian's mobile service or a service center will have the specialized tools and software to read the specific fault codes, pinpoint the problem, and perform necessary repairs. They can also advise you on whether it's safe to drive the vehicle to a service center or if it requires towing.

Given the nature of high-voltage systems, it's crucial not to attempt DIY repairs beyond basic checks. Always prioritize safety and rely on certified technicians for these types of issues.

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