2018 Tesla Model 3 seats problems

Filed Nov 6, 2026 · Airbags, Seats · MI

The passenger occupant sensor failed and was repaired under a recall, performed by a Tesla technician at my home on July 28, 2020. On February 3rd 2021 the same dashboard warning returned, and Tesla replaced the entire passenger seat. The warning returned a third time on October 5, 2026. The first available service appointment was October 29, a 24-day wait, during which the passenger airbag system could not be relied on to detect an occupant. On October 29, Tesla also replaced the passenger airbag. Tesla has not given me a written diagnostic explanation for the airbag replacement, or confirmation of why the recall remedy consisting in a matched sensor/airbag combination has to be paid for by the customer. I am concerned that the recall remedy did not hold, failing three times, and that a safety-critical system was left in question for nearly four weeks. I have 20 years of experience in automotive seating and am willing to provide records. Records available: service invoices, estimate, and written communications with Tesla.

Filed Sep 30, 2026 · Airbags, Seats · CO

The passenger seat back Occupant Classification System (OCS) sensor (Part #1920673-01-A) failed 3 times in under 22 months (Dec 2024, Dec 2025, Sep 2026), disabling the front passenger safety restraint system and airbag deployment logic

Filed Sep 16, 2026 · Airbags, Seat belts · AZ

Vehicle Information: Year/Make/Model:Â 2018 Tesla Model 3 Mileage at Incident:Â 45,000 miles Description of Safety Defect: A sudden and persistent "Safety Restraint System Fault" / "Front Passenger Safety Restraint System Fault" warning illuminated on the vehicle's primary touchscreen interface, indicating a complete compromise of the supplemental restraint and airbag system. Upon inspection by Tesla Service, the root cause was identified as physically broken/severed internal copper wiring within the first-row passenger seat harness assemblies. This breakage occurred purely due to the mechanical wear-and-tear of normal fore-and-aft seat tracking (including the standard vehicle "Easy Entry" setting). Because the electrical line cleanly severed, communication to the Occupant Classification System (OCS) sensor was totally cut off, preventing the vehicle from accurately detecting passenger occupancy or correctly configuring front passenger airbag deployment logic in a collision. Tesla has addressed this known design vulnerability internally via Service Bulletin SB-23-20-002, replacing the weak early-production parts with ruggedized components. However, because the vehicle was past its calendar warranty period despite having only 45,000 miles, I was forced to pay $1,322.00 out of pocket to restore critical safety systems. Because a severed seat harness disables essential airbag safety constraints through normal everyday use, this represents a systemic manufacturing defect that should be escalated from a Technical Service Bulletin to a mandatory Safety Recall to protect all owners. Specific Component Part Numbers Replaced: First Row Seat Harness Assemblies: P/N 1489060-02-G & 1489060-03-G Passenger Airbag Assembly Module: P/N 1077323-00-G Seat Position / Occupancy Sensor Module: P/N 1099592-00-F

Filed Aug 20, 2026 · Airbags, Seats · CA

My Tesla Model 3 has a persistent RCM_a056 alert indicating a problem with the front passenger occupancy detection system. The unresolved fault affects the operation of the front passenger airbag system. I paid Tesla approximately $1,000 for a repair intended to resolve this problem. Tesla replaced multiple components associated with the passenger seat/occupancy detection system, including the sensor, wiring, and other safety-system components. The repair did not resolve the problem. The RCM_a056 alert remained unchanged after the repair. I returned the vehicle to Tesla for further diagnosis. Tesla tested the individual components and documented that they found “no issues present,” but the RCM_a056 alert remained. Tesla then recommended replacing the entire passenger seat assembly at a cost of approximately $3,000. When I asked what diagnostic evidence indicated that the seat assembly was defective, I was told that they had no specific evidence that replacing the seat would resolve the problem. They were unable to identify a failed component and indicated that replacing the entire seat was the only remaining repair they could suggest. I am concerned that this represents an unresolved safety-system defect. I have already paid approximately $1,000 for a repair that did not resolve the fault, and Tesla is now recommending another $3,000 repair without identifying the cause of the failure. The vehicle remains unavailable for normal use because of the unresolved passenger restraint/airbag-system fault. I am requesting that the federal safety agency document and investigate this potential safety defect, particularly if other Tesla Model 3 vehicles are experiencing the same persistent occupancy-detection failure.

Filed Jul 26, 2026 · Airbags, Electrical · CA

Component/system: The front passenger Occupant Classification System (OCS) in my 2018 Tesla Model 3. The vehicle is available for inspection on request. Description of the failure: The vehicle intermittently displays "Front passenger safety restraint system fault — service required]" on the center touchscreen. The alert first appeared on or about 4 years ago and has recurred approximately ~50 times since. The failure is strongly correlated with cabin temperature. It appears after the vehicle has been parked in direct sun in warm weather, and clears on its own once the cabin cools. It has not occurred in cooler ambient conditions. Safety risk: On this vehicle the front passenger seat uses a capacitive Occupant Classification System rather than a simple occupant-detection pad. The restraint control module uses OCS output to determine both whether the passenger airbag deploys and at what force. When the system faults, I have no way to know whether the passenger airbag is suppressed, will deploy at an inappropriate force for the occupant, or will deploy at all. This directly compromises frontal crash protection for anyone in that seat. I have been avoiding seating passengers there as a result. Inspection and confirmation: The vehicle is outside the basic warranty. Per Tesla's own service documentation, the passenger-side OCS sensor is not individually serviceable; the remedy requires replacing the seat cushion assembly and running a proprietary calibration routine that requires a cabin temperature near 68°F. The vehicle has not been inspected by police, insurance, or any independent shop. Prior warning symptoms: The touchscreen alert described above is the only symptom. There was no prior indication. There is no open recall for this condition on my VIN. Given the number of similar owner reports and the cost of the remedy, I believe many affected vehicles remain unrepaired and in service.

Filed Jun 2, 2026 · Airbags, Seat belts · AZ

The front passenger safety restraint system is triggering an on-screen warning error that says service is required. This puts my front passenger at risk of death in the event of an accident. I have sent the manufacturer (Tesla) a request for service and received a confirmation of the errors with a list of parts to be replaced for a sum of $1200.65. I understand there is a service bulletin for this issue (Bulletin SB-19-20-003), but Tesla still will not fix it for free even though it is a safety issue. In the estimate, Tesla listed the following components as failure points that need to be replaced: 1) FIRST ROW OCCUPANCY SENSOR(1099592-00-F) 2) FIRST ROW - SEAT BELT REMINDER SENSOR BOX CLIP(1130363-00-B) 3) FIRST ROW SEAT HARNESS ASSEMBLY - RIGHT HAND(1489060-03-G) 4) AIRBAG HARNESS RETAINING CLIP(1028053-00-A) 5) BOLT,EHS,M6X19,[88],ZN,SMAT,ADH. - KNEE AND PASSENGER AIRBAG BOLT(1116594-00-B) 6) BOLT RC M6-1.25x26(1036655-00-A) 7) PASSENGER AIRBAG(1077823-00-G) 8) BOLT,HF,M6X7,STL[88],ZN,SHLDR[8X18]. (1105061-00-E)

Filed Apr 10, 2026 · Electrical, Seats · 95,000 miles · CA

The contact owns a 2018 Tesla Model 3. The contact stated that while opening the doors of the vehicle, the driver's side seat back unintendedly reclined and pressed down on the rear seat, causing the cushion to become deformed. The contact manually used the seat controls to return the seat to an upright position. There was no warning light illuminated. The contact stated that the failure was intermittent and only occurred while the doors were opened. A Tesla service center was contacted; however, an appointment was not scheduled for diagnostic test. The contact was provided an estimate for the repair. The vehicle was not diagnosed or repaired. The failure mileage was approximately 95,000.

Filed Mar 16, 2026 · Airbags, Electrical · CA

Error code RCM_a021 front left safety restraint system fault. An issue that arises purely due to poor seat design. It is the fault of the seat pinching a wire from moving back and forth. This safety issue is an inevitability and not a one off chance. This issue is publicly noted on forms throughout all the years of this car’s production. This error results in airbags not being properly deployed in the event of an accident and the car not properly reading the passenger occupancy.

Filed Oct 3, 2025 · Airbags, Seat belts · IL

Driving a 2018 Tesla Model 3, driver seat shows message "Front left safety restraint system issue. Service is required". This occurs when the driver is in the seat with the seat belt fastened and the vehicle is in motion. This issue refers to the possible seat belt, seats and/or air bags failure. This is a threat for drivers as these are the front line of defence in case of any collisions or accidents. This issue has been reported by multiple Tesla car drivers and their posts are available on online forums. Message appears on the Tesla screen driven. Tesla does not cover this out of warranty. My appeal to NHSTA is this is hazardous to drivers and cars should be recalled and repairs should be covered.

Filed Aug 19, 2025 · Seat belts, Seats · CA

A sensor for the driver side safety restraint system was displayed from the vehicles screen. Potentially loose wires under the seat when manufactured.