Rivian R1S (Gen 2) Diagnostics
Classification: Electric Vehicles Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the Rivian R1S (Gen 2).
Indexed Fault Codes for R1S (Gen 2)
Step-by-step resolution manuals and root cause matrices
HV Battery Isolation Fault Turtle Mode
The Battery Management System detected high-voltage leakage to vehicle chassis ground below the 500 ohms/volt threshold (typically under 200 kOhms absolute), triggering a safe isolation state and limiting drive power via Turtle Mode to prevent electrocution or pyrotechnic disconnect activation.
HV Isolation Degraded BMS_a035
The Battery Management System (BMS) detected that electrical isolation resistance between the 400V/800V high-voltage DC bus and the low-voltage 12V chassis ground dropped below the standard threshold (typically <500 ohms/volt or <100 kΩ total). This safety interlock prevents potential electric shock or thermal events by inhibiting DC fast charging and vehicle drive readiness.