Rivian Diagnostics & Fault Manuals
Manufacturer of R1T / R1S Gen 2 adventure electric trucks with quad-motor drive units and air suspension.
Equipment Models
Hardware families produced by Rivian
Gen 2 R1S
3 guidesClass: Electric Vehicles Equipment
Gen 2 R1T / R1S
1 guidesClass: Electric Vehicles Equipment
R1S
1 guidesClass: Electric Vehicles Equipment
R1S (Gen 2)
2 guidesClass: Electric Vehicles Equipment
R1T (Gen 2)
2 guidesClass: Electric Vehicles Equipment
Rivian R1T (Gen 2)
0 guidesClass: Quad-Motor Electric Adventure Truck
Rivian R1T (Gen 2)
0 guidesClass: Quad-Motor Electric Adventure Truck
Rivian R1T (Gen 2)
0 guidesClass: Quad-Motor Electric Adventure Truck
Rivian R1T (Gen 2)
0 guidesClass: Quad-Motor Electric Adventure Truck
Rivian R1T (Gen 2)
0 guidesClass: Quad-Motor Electric Adventure Truck
Rivian R1T (Gen 2)
0 guidesClass: Quad-Motor Electric Adventure Truck
Indexed Error Codes for Rivian
Machine-verified error code diagnostic walkthroughs
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 Contactor Open Isolation Fault
BMS_b018 indicates that the Battery Management System detected an isolation breakdown (chassis leakage < 500 ohms/volt) across the high-voltage bus while main contactors were commanded open or during the pre-charge sequence, triggering an immediate vehicle immobilize safety lockout.
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.
High Voltage Isolation Fault
BMS_a171 is triggered when the Battery Management System detects that insulation resistance between the 400V/800V High Voltage DC bus and the 12V chassis ground drops below the safety threshold (typically <500 ohms/volt or <100 kOhms total), resulting in drive system shutdown to prevent electric shock.
HV Isolation Degradation Warning
BMS_b017 indicates that the Battery Management System has detected a loss of electrical isolation resistance between the 400V/800V high-voltage bus and chassis ground, falling below the critical threshold (typically <500 Ohms/Volt or <100 kΩ total resistance).
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.
HV Isolation Resistance Degraded
The Battery Management System detected chassis-to-HV bus isolation resistance dropping below the safety threshold (typically <500 kΩ or <100 Ω/V). This indicates partial leakage between high-voltage positive or negative rails and vehicle chassis ground.
Contactor Opening Isolation Degradation
The Battery Management System (BMS) detected chassis isolation resistance dropping below the safety threshold (<500 ohms/volt or <100 kOhm total) during high-voltage operation, triggering an emergency opening of the main contactors to prevent electric shock and thermal hazards.
HV Isolation Contactor Lockout
Error BMS_b047 triggers when the Battery Management System detects high-voltage isolation resistance falling below safe operating thresholds (<500 ohms/volt or roughly <200 kOhms to chassis ground). To protect the chassis from electrification, the BMS commands pyrofuse integrity checks and main contactor separation, downgrading the drive unit into Turtle Mode or an outright vehicle shutdown.