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2023 R1T Reduced Power Mode and Check Engine Light - P0AFA Code

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Mark S. · rep 0 · May 22, 8:21 AM · 1 replies · solved · Question

Vehicle: 2023 Rivian R1T Launch Edition

Hey everyone,

I'm hoping someone here has experienced something similar with their Rivian. I have a 2023 R1T Launch Edition, and yesterday while driving on the highway, I suddenly got a "Reduced Power" warning on the dash. The truck immediately felt sluggish, and the check engine light came on.

I pulled over safely and used my OBD-II scanner. It's showing a P0AFA code, which I understand is related to the high-voltage battery system. I tried clearing it, but it came right back.

Has anyone dealt with this specific code or reduced power mode on their R1T? What was the fix? Is this something I can troubleshoot myself, or am I looking at a definite service center visit? Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer: The P0AFA code in your 2023 Rivian R1T indicates an issue with the high-voltage battery system, specifically a low voltage condition. This often triggers a 'reduced power' mode to protect the vehicle's components.

Here are the common causes and steps:

  1. Check the 12V Auxiliary Battery: While your Rivian is an EV, it still relies on a 12V battery for control modules, including the Battery Management System (BMS). A weak or failing 12V battery can cause a cascade of seemingly unrelated high-voltage system errors, including P0AFA. Ensure it's fully charged and healthy.
  2. High-Voltage Battery Cell/Module Fault: One or more cells or modules within the main high-voltage battery pack could be underperforming or failing, leading to an overall low voltage reading.
  3. Battery Management System (BMS) Malfunction: The BMS monitors the health, temperature, and voltage of individual battery cells. A fault in the BMS itself can lead to incorrect readings or improper management of the battery pack.
  4. High-Voltage Contactor Issues: The contactors are relays that connect and disconnect the high-voltage battery from the rest of the powertrain. If one fails to close properly or is stuck open, it can cause a low voltage condition.
  5. Wiring and Connections: Loose, corroded, or damaged wiring within the high-voltage system can interrupt power flow or provide inaccurate sensor readings.

When to see a shop:

  • Immediate Professional Diagnosis: Due to the complexity and high voltage involved, it is strongly recommended to have your Rivian inspected by a certified Rivian service center or an EV-specialized technician as soon as possible.
  • Safety First: Do NOT attempt to diagnose or repair high-voltage components yourself unless you are a trained and certified EV technician. High-voltage systems carry a significant risk of severe injury or death.
  • Specialized Tools: Diagnosing P0AFA often requires specialized diagnostic tools to read individual cell voltages and perform system tests that are not available to the average owner.
  • Warranty: Your 2023 Rivian R1T is likely still under warranty. Contacting Rivian service directly will ensure proper diagnosis and repair under warranty terms.
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