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2023 R1S Battery Cooling System Warning & Power Limit

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David L. · rep 0 · May 25, 5:05 AM · 1 replies · solved · Question

Vehicle: 2023 Rivian R1S Quad-Motor

Hi everyone, I'm reaching out about a problem I'm having with my 2023 Rivian R1S Quad-Motor. I was driving yesterday, and after about an hour on the highway, I got a 'Battery Cooling System Malfunction' warning on the display. Almost immediately, the truck limited my power, and I noticed the charging speed at the next fast charger was significantly reduced.

It was a warm day, around 90°F, but I wasn't doing anything strenuous like towing or off-roading. The vehicle has about 12,000 miles. I'm worried about potential battery damage or long-term issues if the cooling system isn't working correctly. I tried restarting the vehicle, but the warning eventually came back.

Has anyone else experienced this specific warning with their R1S? What was the cause? Is this something that can be fixed with a software update, or does it point to a hardware failure with the cooling pumps or radiator? Any insights would be helpful.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:05 AM

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ClearTheCode admin answer:

A 'Battery Cooling System Malfunction' warning on your 2023 Rivian R1S, especially when accompanied by power limitations and reduced charging speed, indicates a critical issue with the vehicle's thermal management system. This system is vital for maintaining optimal operating temperatures for the battery pack and electric motors, preventing overheating and ensuring longevity.

  1. Initial Actions: If the warning persists, avoid demanding driving conditions (e.g., high speeds, heavy acceleration, towing) and refrain from using DC Fast Chargers, as these generate significant heat. Continued operation with a compromised cooling system can lead to battery degradation or damage.
  2. Common Causes for Cooling System Malfunction:
    • Coolant Pump Failure: The electric coolant pumps circulate fluid through the battery pack and motors. A failing pump is a common cause for insufficient cooling.
    • Coolant Leak/Low Fluid Level: A leak in the cooling lines, radiator, or other components can lead to a low coolant level, reducing the system's ability to dissipate heat.
    • Radiator/Heat Exchanger Blockage: Debris or internal blockages in the radiators or heat exchangers can impede airflow or fluid flow, leading to overheating.
    • Temperature Sensor Malfunction: A faulty temperature sensor might incorrectly report high temperatures, triggering the warning and power limit even if the actual temperature is fine. However, the power reduction suggests a real thermal event.
    • Control Module Issue: The thermal management control unit might have a fault, preventing it from properly managing the cooling system components.
    • Air in the System: Air pockets in the coolant lines can reduce cooling efficiency.
  3. Diagnostics: Your Rivian will log specific Diagnostic Trouble Codes (DTCs) related to the thermal management system. These codes will identify which sensor, pump, or other component is reporting an issue. A Rivian service technician will use specialized diagnostic tools to read these codes and perform system tests.
  4. When to See a Shop: A 'Battery Cooling System Malfunction' is a serious warning that requires immediate professional attention. Do not ignore it, as prolonged overheating can severely impact battery health and safety. Contact Rivian Service to schedule an appointment. They will diagnose the exact cause and perform the necessary repairs, which could involve replacing pumps, sensors, lines, or refilling/bleeding the coolant system.
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