Hardware Model Specification
Rivian Gen 2 R1T / R1S Diagnostics
Classification: Electric Vehicles Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the Rivian Gen 2 R1T / R1S.
1 Documented Faults
•
Full Multimeter & Safety Isolation Procedures
Indexed Fault Codes for Gen 2 R1T / R1S
Step-by-step resolution manuals and root cause matrices
CODE BMS_a171
Severity: High
Difficulty: Advanced
HV Battery Isolation Resistance Degraded
The Battery Management System (BMS) detected that isolation resistance between the High Voltage (HV) bus (positive or negative) and the vehicle chassis ground has fallen below the safety threshold (typically <500 ohms/volt or <100 kOhm total), entering a degraded drive or turtle mode to prevent shock hazard.
⏱ 60-120 Mins
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