Rivian is recalling nearly 4,000 more R1S SUVs and R1T pickups for the exact same turn signal defect it already recalled once — because the supplier tasked with keeping bad parts off the assembly line didn’t. According to NHTSA campaign 26V508000, one or both front turn signals on the affected trucks may fail to illuminate and flash at all, a straightforward violation of Federal Motor Vehicle Safety Standard 108.

What’s Affected

• 3,829 vehicles total — 3,204 R1S SUVs and 625 R1T pickups.
• 2025 and 2026 model-year trucks, specifically R1S units built between June 12, 2024 and May 26, 2026, and R1T units built between October 1, 2024 and March 19, 2026.
• This expands an original recall — NHTSA campaign 25V387000 — that covered 27,882 R1S and R1T vehicles for the identical defect starting in September 2025.

A non-functioning turn signal sounds minor next to a battery fire or a brake failure, but it’s still a legally mandated safety signal other drivers rely on to know what you’re about to do. NHTSA classifies a failed turn signal as increasing crash risk, full stop, and that’s the standard the agency is holding Rivian to here.

Why the First Fix Didn’t Stick

This isn’t a new failure mode, and that’s what should frustrate owners most. Rivian already ran a recall for this exact problem in September 2025, covering 27,882 vehicles. The expansion exists because the supplier building the front turn signal lamps, Myotek, didn’t properly quarantine the parts that failed to meet Rivian’s specifications the first time around. Instead of getting pulled from the supply chain, some of those already-known-bad components kept shipping and landed in another 3,829 trucks.

Rivian says it identified 17 additional field failures between June 2025 and July 2026, which is what triggered the investigation that uncovered the quarantine breakdown. In other words, the company caught its own supplier’s mistake only after enough owners started reporting the same problem a second time.

What Owners Should Do

The fix itself is minor: Rivian will inspect both front turn signal lamps at authorized service centers and replace them at no charge if they’re affected, a job the company says takes under an hour. Both interim and formal remedy notification letters are scheduled to go out to owners no later than September 29, 2026. Owners who don’t want to wait for a letter can check their VIN directly against the campaign at NHTSA.gov.

The bigger question is what a repeat failure like this signals about supplier quality control at a company still ramping production. A part defect is one thing. A defect that gets caught, recalled, and then quietly re-enters the supply chain anyway is a different kind of problem — one that has less to do with engineering and more to do with whether Rivian’s quality checks actually catch what they’re supposed to catch.