2018 Tesla Model 3 seat problems

SEATS

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 NHTSA document and investigate this potential safety defect, particularly if other Tesla Model 3 vehicles are experiencing the same persistent occupancy-detection failure.

NHTSA complaint #11758370 — an unverified report by a vehicle owner.

SEATS

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.

NHTSA complaint #11752890 — an unverified report by a vehicle owner.

SEATS

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)

NHTSA complaint #11741704 — an unverified report by a vehicle owner.

SEATS

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.

NHTSA complaint #11730362 — an unverified report by a vehicle owner.

SEATS

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.

NHTSA complaint #11724519 — an unverified report by a vehicle owner.

SEATS

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.

NHTSA complaint #11691197 — an unverified report by a vehicle owner.

SEATS

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

NHTSA complaint #11681745 — an unverified report by a vehicle owner.

SEATS

This message has been intermittent and looking online has happened a lot for this model. The front passenger restraint system is critical for passenger safety, this should be a recall. Concern: Customer states:Alerts - Seats - Front passenger safety restraint system issue/Service is required Detected August 16, 2025

NHTSA complaint #11681103 — an unverified report by a vehicle owner.

SEATS

An error code (RCM_a056) will intermittently come up and say there is a fault with the front passenger safety restraint system. It will turn on for a car ride and stay off for a few days and come back randomly. When I researched this code, I found that this is a known issue with 2018 Tesla Model 3's. Apparently there was a flaw in the airbag system which causes this safety concern. I contacted a Tesla service center and they said it would cost $300 just to check it out and another one said +$1000 to "fix". I called their customer service line explained that this should be covered for free since it is not due to "normal wear" but rather should be a safety recall. I also explained this to the service techs but they just said they can't do anything. If I would have been involved in an accident, my wife could have died because of this safety flaw. The vehicle is still under warranty until 120,000 miles. Thank you for your consideration on this matter.

NHTSA complaint #11669771 — an unverified report by a vehicle owner.

SEATS

RCM_a021 Front left safety restraint system fault error

NHTSA complaint #11668790 — an unverified report by a vehicle owner.

SEATS

Vehicle is displaying an error message "Front passenger safety restraint system fault" and "front passenger safety restraint system fault. Service is required." This has the result of "The restraint system may not function as designed." According to an Internet search, this is a very common fault, caused by "interference" and necessitates an occupancy sensor, wiring harness and airbag module exchange.

NHTSA complaint #11663977 — an unverified report by a vehicle owner.

SEATS

Tesla is aware of a common regarding an occupancy sensor in the passenger seat of their vehicles that impacts functionality of airbags and the restraint system. The error code is RCM_a056. A simple search of the code will show a myriad of ongoing issues with their vehicles

NHTSA complaint #11653174 — an unverified report by a vehicle owner.

SEATS

Got warning about front drivers safety restraint failure on screen. Airbag warning began to display on the side showing if an accident occurred, they would not deploy. Talked with Tesla representatives and was told this is a known issue but would not be covered. Seems to be faulty wiring from chair moving over time based on what I was able to read. Error code was rcm_a021.

NHTSA complaint #11620367 — an unverified report by a vehicle owner.

SEATS

Concern: I See the error message on my screen like restraint system fault require service. when I contacted Tesla for Sevice Repair I got an estimate which includes following fixes for a charge of 1,804.02. They are not covering for this saying the car is out of warranty. Seems like Tesla is aware of this issue and impacting many other Tesla's for 1) FIRST ROW SEAT HARNESS ASSEMBLY - RIGHT HAND(1489060- 03-G) 2) FIRST ROW - SEAT BELT REMINDER SENSOR BOX CLIP(1130363-00-B) 3)Correction: Replace Front Passenger Airbag And Update Vehicle Configuration - Remove and Replace

NHTSA complaint #11618804 — an unverified report by a vehicle owner.

SEATS

My vehicle has a faulty seat sensor in the drivers seat. In some instances my car remains on without my knowledge when exiting. I return to the car with the headlights on and the main info screen on as if there were someone seated inside. Since this is a keyless electrical vehicle, we have been trained to just exit the vehicle without pressing a off button or turning a key to the off position and removal. Also when entering the car and first sitting down in the seat, the car then turns off completely after closing the door. The car will turn back on after buckling the seat belt or pressing the brakes. After researching to see if there was a fix or if it was a known issue I stumbled upon a large number of people and threads that are having the exact same problem. Even after I have turned on the pin functionality to drive the car, of what use is this if the car remains on after exiting and anyone can access the car while the pin was already entered. Anyone could have accessed my vehicle during these times and the security function was not active (Sentry Mode) because the car thought that the primary driver was inside. The first instance of this happening was back in 2020. But it could have potentially started much sooner. The incident in 2020 was bothersome enough to remain in my recollection. It happened during a road trip from Corona CA to Mammoth CA at a charging station located in Lone Pine CA.

NHTSA complaint #11616315 — an unverified report by a vehicle owner.

SEATS

Occupant classification System (OCS) for front passenger seat kept alerting while driving both with and without any person or object in the seat. I contacted Tesla service center and they stated that the occupant classification system (OCS) AND the front passenger airbag require replacement, otherwise the front passenger airbags will not function properly in a collision. I asked if this was a recall or covered by warranty, and they said no.

NHTSA complaint #11612101 — an unverified report by a vehicle owner.

SEATS

RCM_a021 Front left safety restraint system fault RCM_a056 Front passenger safety restraint system fault I have been noticing this error on my Tesla Model 3. Also, I researched on it and found out numerous people are having same problem. So, since it’s safety related issue there should be recall to fix it.

NHTSA complaint #11611122 — an unverified report by a vehicle owner.

SEATS

I started getting this alert on my screen a few weeks ago: RCM_a056 "Front passenger safety restraint system fault" Service Required. Tesla says the warranty only covered this issue up to 60,000 miles and I'm at 61,000. They are quoting like $2,000 to fix. They say they have to change something in the seat (sensor) and change the air bag since new sensor is not compatible with old airbag. Looked up issue and it seems to be common happening at before and after warranty for a lot of people. I see different quotes from $500 to $2000 (mine was the highest). This should be a safety recall. I do not suspect too many people getting this fixed on their own their due to the expense.

NHTSA complaint #11610888 — an unverified report by a vehicle owner.

SEATS

I randomly received an alert indicating “Front passenger safety restraint system fault” on my Tesla’s display. When I look this up, it indicates that the airbag may not deploy correctly in the event of an accident due to a seat sensor malfunction. When I contacted the service center, they quoted me at $1500 to repair this critical safety issue (involves replacing the seat sensor and reconfiguring airbags so that they will properly deploy). I believe this should be a recall and not something customers have to pay out of pocket to drive their car safely.

NHTSA complaint #11608623 — an unverified report by a vehicle owner.

SEATS

getting a "front left safety restraint fault" warning when moving the driver seat...is a known issue in tesla forums where the seat wiring harness is not secured properly and either a wire is crimped by the seat mechanicals or a wiring harness is pulled loose...

NHTSA complaint #11600206 — an unverified report by a vehicle owner.

SEATS

Started receiving Error RCM_a056 Front Passenger Safety Restraint System Fault. The vehicle shows that the passenger airbags are DISABLED after the alert is issued. I am working under the assumption that all passenger airbags (front, side, overhead) are currently disabled at all times. This puts my family at risk if there were to be a collision. Tesla seems to know exactly what the problem is because the estimate came back shortly with a list of fixes required at a cost of $1,768.35 to 1) Correction: install an Occupant Classification System (OCS) filter Module, 2) Correction: Retrofit SBR in OCS Equipped Front Passenger Seat - Remove and Replace, and 3) Correction: Replace Front Passenger Airbag and Update Vehicle Configuration - Remove and Replace. Quick internet search shows this is a SYSTEMIC problem with a bad part (Tesla forums and search your own databases for the past year or so... these are the people who know to report this to you, there are probably a lot of others). I'm 6 months out of warranty for a sensor that should not have wear and tear. Furthermore a retrofit demonstrates that they are replacing a KNOWN problem part. Additionally, there is no rational reason to replace a perfectly good airbag. Replacing the airbag because it is incompatible with a retrofit sensor should be free. Retrofitting a sensor that has a known problem should not be a cost to the consumer for a part that is not subject to wear and tear. Adding a filter to a sensor line shows that the sensor is not an appropriate part or the filter should have been added to start with in original manufacturing. Note Tesla has a procedure already out to address the problem SB-23-20-002 which shows they already know it is a problem that needs to be addressed when the sensor failure shows up. Recommend and request an investigation into whether there is a lower cost fix for what seems like a known problem or require a recall to repair to a safe state.

NHTSA complaint #11597112 — an unverified report by a vehicle owner.

SEATS

Received an alert about front seat safety restraint system fault. Decided to see what was needed for the fix and address my other trunk harness recall. Received invoice stating the airbag needed to be replaced along with $1900 quote. Knowing this info, if this doesn’t get fix the safety of my passengers are at risk so now I definitely can’t have any passengers. Not sure how I should be responsible for a safety seat airbag sensor defect.

NHTSA complaint #11595919 — an unverified report by a vehicle owner.

SEATS

My 2018 Model 3 started giving me the error "RCM_a056_passengerFrontOCS" today. This is caused by a faulty passenger occupancy weight sensor. This has been an ongoing issue in these models evidenced by SB-23-20-002 being revised 6 times. Tesla has resisted fixing this safety issue because the air bag also needs to be replaced to maintain compatibility with the redesigned Occupant Classification System (OCS) weight sensor evidenced in Tesla SB-23-20-001. Tesla has redesigned the known bad sensor part no. part 1121234-70-B with an updated part no. 099592-00-F which is only compatible with an updated airbag. The OCS weight sensor was defective from the point of manufacture. The RCM_a056 error only appeared after applying the latest firmware update that addresses NHTSA recall 24V-376. The firmware update made the firmware more sensitive to analog sensor readings which revealed the originally defective OCS weight sensor triggering the error message. Nearly half of the recent NHTSA complaints for this model involve this exact issue. This OCS hardware sensor was always defective and poses an ongoing safety concern. The defective system never should have been approved as it did not function as intended originally. The NHTSA must issue a new recall that covers the defective hardware instead of just the software as in NHTSA recall 24V-376. Without corrected hardware the OCS system will not work as intended which is allowing the airbags to prevent injury and death in the event of collision. [XXX] TeslaSB-23-20-002Replace Occupant Classification System (OCS) of Front Passenger Seat while Servicing Subcomponents TeslaSB-23-20-002 R1 TeslaSB-23-20-002 R2 TeslaSB-23-20-002 R4 TeslaSB-23-20-002 R5 TeslaSB-23-20-002 R6 TeslaSB-23-20-001Update Front Passenger Airbag to Maintain Compatibility While Servicing Front SB Passenger Seat [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11594071 — an unverified report by a vehicle owner.

SEATS

The car issued me a "front left safety restraint system fault" saying service is required. The code it flashed was RCM_a021. I am able to get the code to go away by adjusting the seat, however, if i shift my weight or i hit a bump in the road, the warning will appear once again. This leads me to believe that there is a component in the seat that is defective. I took vehicle to the Tesla service center where they found a "broken wire in the pretensioner connector" and they replaced the wiring harness. Upon doing investigation it appears that there are multiple components that are used to determine the firing intensity of the airbags should they go off. If either are damaged the airbags will not fire correctly. Some of these components can be easily damaged due to the seats constant back/forth motion if the easy entry mode is enabled on the car. As the car was outside the warranty period, Tesla refused to cover the costs for repair even though there was a TSB (technical service bulletin) already out on this same issue (reference SB-21-17-005). Total cost for repair including parts, labor and tax was $631.10.

NHTSA complaint #11593668 — an unverified report by a vehicle owner.

SEATS

Front Passenger Safety Restraint System Fault. From Invoice: Tesla to Replace Front Passenger Airbag And Update Vehicle Configuration Passenger Airbag error malfunction!!! Passenger Airbag Harness Malfunction!!! Correction: Retrofit SBR in OCS Equipped Front Passenger Seat - Remove and Replace Seatbelt issue!!! FIRST ROW SEAT HARNESS ASSEMBLY - RIGHT HAND FIRST ROW - SEAT BELT REMINDER SENSOR BOX CLIP FIRST ROW OCCUPANCY SENSOR Giving an error and now they are charging me to fix this defect in my Tesla Model 3

NHTSA complaint #11592837 — an unverified report by a vehicle owner.

SEATS

Keep getting a safety restraint system fault error displayed and the estimate is more than $2000.This error just came out of the blue and I am not sure if the vehicle is safe to operate.

NHTSA complaint #11589775 — an unverified report by a vehicle owner.

SEATS

The buttons in the interior seem to be degrading much quicker than it should be. The window levers become lose and can break off. This is a safety hazard as in not able to raise the window if it allows to lower it. One has to park in order to raise windows in the mobile application. The plastics are breaking too quickly. There is also an issue with levers for the seat adjusting. Also, when canceling service requests in their application, Tesla deletes or hides them without an ability to see what was written to show proof later of their faults.

NHTSA complaint #11588726 — an unverified report by a vehicle owner.

SEATS

While driving normally, an error warning was received that stated "Front Left Safety Restraint System Error" and the icon for an airbag fault would come in simultaneously. This error would disappear and reappear, sometimes up to 10 times per minute, creating a driver distraction due to the loud error chime. The error code identified for the fault when checked on the Tesla service screen corresponded to pretensioner wire harness. The pretensioner harness connects the seat sensors for driver weight and positioning to the car's airbag control system, which then classifies passengers and ensures that the airbags fire correctly in the event of a collision. For example, if a smaller female driver was operating the car but was incorrectly classified as male, the airbag could fire with excessive force and cause injury. The set of symptoms occurs commonly in Tesla Model 3s and are caused by the wear over time of a poorly designed wiring harness, which chafes as the seat is moved forward and backward until it breaks. This is a known problem by Tesla and they have a specific service bulletin designed to address it, which I have attached below. When taken in to address the issue, Tesla performed the procedure in the attached bulletin and identified a damaged harness, which was subsequently replaced. I retained the damaged harness for inspection. The invoice for this service is attached. No other defects were identified that could have caused the issue. This is a safety related issue occurring due to a manufacturing related defect and should be a mandatory recall with complimentary repair.

NHTSA complaint #11587940 — an unverified report by a vehicle owner.

SEATS

Passenger Airbag and seat are faulty. Received error message on my car “front passenger safety restraint system faulty”. Tesla is wanting to replace the airbag and passenger seat and seat belt and it will cost few thousands dollars.

NHTSA complaint #11586476 — an unverified report by a vehicle owner.

SEATS

A defect in manufacturing causes the seat sensor (in this case: passenger) connection to fail. The connection has no retaining clip and falls out. This disables the airbag deployment calculations. Error code: RCM_a056 Telsa wants to replace seat and calibrate airbag at consumer's cost, Quoted ~$1500 I've pushed the connector back in several times over the past few years, one day it's going to hurt someone.

NHTSA complaint #11585180 — an unverified report by a vehicle owner.