Within 48 hours of picking up my new 2026 Rivian R1S Dual Standard, I experienced a power steering fault while on a public roadway to where the vehicle entered a crawl mode and the power steering stopped working. The car was not steerable. I spent an hour on the phone with Rivian emergency roadside support and they had me perform a reset of the vehicle which restored the steering. However, it was still recommended by roadside service that the vehicle be looked at by the service team so it was towed to Gaithersburg service center. The problem was later identified in the system logs as a known firmware condition that is currently under investigation with no permanent fix at this time. There were no warnings or indication of this issue prior to it occurring. The issue has not happened again since it was at the service center.

Driver was making a left hand turn and as the turn was initiated the driver had no control of the vehicle. The vehicle system took over driving, causing substantial damage to the vehicle. Weeks leading up to the incident, the display and certain systems were not responding or provided errors. Following a reset each time, the vehicle would be operational.

SUPPLEMENTAL COMPLAINT — This filing supplements VOQ No. XXX filed XXX for the same vehicle and incident. The original complaint contained factual inaccuracies that this filing corrects. PROPULSION FAILURE AT HIGHWAY SPEED — KNOWN DEFECT — NHTSA MFR COMMS 11026123 & 11026124 VEHICLE: 2026 Rivian R1S Dual Standard, VIN [XXX], LFP battery. Delivered XXX. ~700 miles at incident. INCIDENT XXX: Navigation showed 8% SOC buffer on arrival at destination 5 miles away — active system assurance of sufficient range. Simultaneous audible alarm and dashboard warning then fired with approximately 15-20 seconds to act at ~60 mph on busy [XXX]. Emergency pull-over executed under extreme time pressure. Complete propulsion loss on highway shoulder. ~80°F. Rivian Roadside quoted 3-hour response; independently hired private tow. Approximately 45 minutes after stall, 12V battery died and hazard lights failed — disabled vehicle on live busy interstate shoulder with no hazard lights in 80° heat. Zero residual power. Towed to West Gardiner Service Plaza. 4 hours on highway shoulder, 3 hours at rest area. $225 out-of-pocket (tow + Lyft). DEFECT: Rivian Hudson NH service (WO-XXX, INV_XXX) confirmed 13% HV battery cell capacity imbalance — dashboard SOC does not reflect actual cell capacity. Factory calibration defect. Firmware update only; HV hardware NOT replaced. Defect unresolved. PRIOR NHTSA FILINGS: Before my May 2026 delivery Rivian filed mandatory EWR communications: - Mfr Comm XXX: warned owners of fast range drop below 20% SOC, instructed to stay above 20%. - Mfr Comm XXX (Nov 24 2025): described progressive inaccuracy below 20% SOC. Component: FUEL/PROPULSION SYSTEM. Both on NHTSA 2026 R1S vehicle page. NON-DISCLOSURE: Neither filing disclosed at sale/delivery May 22 2026. Calibration-complete confirmation never sent to this VIN. BBB Auto Line Case XXX active. VOQ XXX filed. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

PROPULSION FAILURE AT HIGHWAY SPEED — KNOWN DEFECT — NHTSA MFR COMMS XXX & XXX VEHICLE: 2026 Rivian R1S Dual Standard, VIN [XXX], LFP battery. Delivered XXX. 702 miles at incident. INCIDENT XXX: Complete unwarned propulsion failure on [XXX] at highway speed. Dashboard showed 8% SOC immediately before failure — no warning, no alert. Vehicle lost all propulsion 5 miles from nearest charger. Stranded 7 hours. $225 out-of-pocket towing/transport costs. DEFECT: Rivian Hudson NH service (WO-000002294461, INV_20260608-150458) confirmed 13% HV battery cell capacity imbalance via diagnostics — dashboard SOC reading does not reflect actual cell capacity. Factory pre-delivery calibration defect. Firmware update performed; HV battery hardware NOT replaced. Defect unresolved. RIVIAN'S PRIOR NHTSA FILINGS: Before my May 2026 delivery, Rivian filed mandatory EWR communications acknowledging this exact defect: - Mfr Comm 11026123: SMS warning owners range "will drop fast below 20% SOC" and to "stay above 20% SOC until issue resolved." - Mfr Comm XXX (112425_SOCImbalance_Email, Nov 24 2025): Email describing progressive range inaccuracy below 20% SOC. Component: FUEL/PROPULSION SYSTEM. Both appear on NHTSA 2026 R1S vehicle page. NON-DISCLOSURE: Neither communication was disclosed at sale (May 18) or delivery (May 22, 2026). Rivian sold this vehicle with a known active propulsion defect without informing me. Calibration-complete confirmation was never sent to this VIN. REQUEST: I ask ODI to assess whether this constitutes a safety defect requiring recall under 49 USC 30118, and whether Rivian's continued sale of LFP vehicles after these filings without disclosing the 20% SOC limitation warrants investigation. BBB Auto Line Case XXX active. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

When backing into a parking spot on two separate occasions the drivers door popped open while the vehicle was in motion and the doors were locked after my knee brushed against the button to open the door while the car was in motion.