2018 Volvo XC90

This submission supplements NHTSA Complaint #11759206, filed on August 24, 2026, regarding a 2018 Volvo XC90, in order to provide additional relevant information that came to light after the original filing. At the time of the first safety-critical malfunction (in-vehicle warnings including "Transmission Acceleration Performance Reduced" "Gear Lever Locked" and related electrical system symptoms), the service manager at Volvo Cars Brooklyn was able to remotely diagnose the likely cause by telephone, before the vehicle was even towed to the shop, specifically instructing the owner to check for dampness under the driver's floor mat, which was confirmed to be present. This indicates the symptom pattern described (sunroof leak leading to corrosion affecting the transmission, brakes, and electrical system) was already recognized and familiar to Volvo Cars Brooklyn's service staff, not a novel or difficult-to-diagnose issue. Additionally, the owner was informed that multiple other Volvo vehicles were present at Volvo Cars Brooklyn on the same day for repair of the same reported issue. Once arriving at the dealership, the service manager tole us that he had, "Just totaled a vehicle for the same issue." This suggests the underlying defect is not an isolated occurrence, but a broader, recurring pattern affecting multiple vehicles of this platform. This supplemental information is provided to support NHTSA's assessment of whether a safety-related defect trend exists affecting this vehicle platform, consistent with the pattern described in the original complaint and in other publicly available consumer complaints regarding sunroof-related water intrusion on the Volvo XC90.

The vehicle first experienced a safety-critical malfunction while driving on the highway on August 11, 2026, producing in-vehicle warnings reading "Transmission Acceleration Performance Reduced" and "Gear Lever Locked," along with broader electrical system symptoms, requiring the 2018 Volvo XC90 to be towed to Volvo Cars Brooklyn on August 11, 2026. At that time, dampness was discovered under the driver’s floor mat, leading to the discovery of a sunroof leak and resulting water intrusion. The dealership represented the vehicle as fully repaired and safe to drive. The same safety-critical malfunction occurred later that night, while driving about 90 miles away from the dealership, with the same warnings appearing, confirming that the original repair failed to address the underlying issue. Loss of normal transmission and braking function while the vehicle was in motion directly affected the driver's ability to control the vehicle. The vehicle was towed for a second time on the morning of August 12, 2026, to Volvo Cars Brooklyn, where it was confirmed that module corrosion caused by the original sunroof leak had not been properly diagnosed or corrected during the first service visit, and that this corrosion had disrupted signals to the vehicle’s electrical, braking, and transmission systems. The dealership completed a corrective repair on August 12, 2026, replacing the OFM module and removing water, following the second incident. The vehicle has not been separately inspected by Volvo’s manufacturer-level engineering team. This failure is consistent with a broader, documented pattern affecting this vehicle platform. Volvo has previously issued a Technical Service Bulletin addressing a sunroof-related water leak on an earlier model year of this platform. While that bulletin does not specifically cover the 2018 model year, numerous 2018 model year owners have independently reported the same failure pattern, a failed sunroof seal, often linked to clogged sunroof drains.

VIN: [XXX] •Make/Model/Year: 2018 Volvo XC90 •Mileage at time of each incident (58,385 / 58,480 / 68,261) •Approximate dates of each incident Vehicle has experienced recurring brake system failures. First, a seized rear brake caliper (Sept 2025) requiring caliper/rotor/pad replacement. Four days later, brake pedal became stiff and hard to depress; brake booster diagnosed as internally failed and replaced. Approximately 9 months and 9,800 miles later, vehicle experienced complete loss of braking ability while driving — brake pedal would not stop the vehicle, driver had to use the parking brake to stop, vehicle was towed to dealer. All repairs performed at authorized Volvo dealer. This is a repeat failure of the same brake system after a documented repair. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am reporting a serious safety concern involving a 2018 Volvo XC90 T8 PHEV. On [XXX], at approximately [XXX] CT, the vehicle experienced a sudden multi-system safety and actual brake failure while in a parking-lot/low-speed setting near [XXX} in Austin, Texas. The vehicle displayed multiple urgent warning messages and indicators, including power steering failure / stop safely, brake/ABS warning, SRS airbag service urgent warning, stability/traction warning, battery/electrical warning, check-engine warning, and tire-pressure warning. The vehicle ended in an irregular/distressed parking position after trying to locate a concrete block to force stop the car due to ABSOLUTE BRAKE FAILURE, E BRAKE SEEMED TO NOT WORK EITHER. The concern is not simply that a warning light appeared. The event involved steering, braking, airbag/SRS, stability, and electrical warnings at the same time, making the vehicle unsafe to operate AND SOMEHOW THE BRAKES WEREN’T OPERATING DUE TO THE LACK OF FUNCITONING. Photos were taken of the warning messages and vehicle position. Prior related history:
This vehicle has prior safety-system history involving SRS Airbag Service Urgent warnings and braking/vehicle malfunction and movement concerns. Earlier review and discussion involved Volvo engineering, VDDM replacement, CAN/network concerns, calibration requirements, voltage/12V battery considerations, software/module updates, and post-repair validation. The VDDM is understood to participate in vehicle dynamics, stability control, brake coordination, and PHEV regenerative/hydraulic brake interaction. Prior documentation also raised concern that intermittent brake, SRS, VDDM, CAN, and calibration issues may not reproduce during a short dealer test drive. Safety risk:
The safety risk is that the vehicle may experience sudden or intermittent loss, degradation, or warning of systems involved in steering, braking, stability control, and airbag readiness. A simultaneous power steeri INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA

My Volvo's XC90 brakes have failed twice. At around 95,000 miles, my brakes stopped working, and then I had them repair it. They charged me close to $3,500, which they said they were able to cover under warranty, and I only had to pay the deductible, which I don't remember. In less than nine months, at about 104,000 miles, the same problem persists. Both times I was driving the car, by God's grace and luckily, I was under 10 mph. I literally parked and started driving after that, and I realized the brakes weren't working again. I'm just thankful to the Almighty that I was not at 55 or 60 mph on a freeway when the brake stopped working.

The first incidence occurred around [XXX]. I was traveling [XXX] on [XXX] in North Carolina about an hour north of Charlotte. I pulled into a rest area and, upon pressing the brake pedal, heard a bit of a hissing noise and suddenly the brake pedal was extremely hard and the car was very difficult to bring to a stop. I did an online search for what might be wrong and discovered it was likely a brake booster failure. I drove the car onto Charlotte, carefully and with extreme difficulty, and took it to the Swedish Connection, a local Volvo specialist. They confirm the diagnosis and replaced the brake booster. Last night, [XXX], I drove the car down to Pickens South Carolina for work. When I got in to return to Charlotte late at night, I turned the ignition, put the car in reverse, and, with my foot on the brake and waiting to back out of the parking space, I heard that hissing noise again. Sure enough, the brake booster had evidently failed again. I drove the car back to Charlotte, mostly on [XXX], and the electronic braking seemed to work OK under cruise control maintaining speed and distance between other cars in traffic. Of course, driving the vehicle on local roads, through stoplights, and turns was extremely difficult and dangerous. I have returned the car to the same mechanic that repaired the last brake booster. I will be reporting this to Volvo as well, as this is a serious safety issue and defect with my vehicle. The mechanic has confirmed that this has happened in other Volvo XC 90s. The vehicle has NOT been inspected by the manufacturer. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

EXCESSIVE PREMATURE WEARING OF BRAKE PADS AND ROTORS. FROM PERSONAL EXPERIENCE AND DISCUSSING WITH OTHER OWNERS, VOLVO IS AWARE THAT THE BRAKES ON THE XC90 PREMATURELY WEAR (AS IN AFTER 1K-20K NEW BRAKES NEEDED ON ALL TIRES). THE LOCAL DEALERS ALL STATE THIS IS A KNOWN PROBLEM AND THEN DEMAND $1,000 TO REPAIR THE BRAKES. VOLVO'S BRAKES AND/OR BRAKING SYSTEM IS DEFECTIVE AND DANGEROUS AS THE BRAKES PREMATURELY WEAR OUT COSTING CONSUMERS UNNECESSARY MONEY FOR ADDITIONAL REPAIRS WHEN VOLVO COULD RESOLVE THE ISSUE.

WHEN DRIVING THE VEHICLE AT A SPEED OF 15-40 MPH, THE SUV IS ACTIVATING THE CRASH IMMINENT BRAKING "CITY CRASH AVOIDANCE" WITHOUT ANYTHING IN THE PATH OF THE VEHICLE. THIS ACTION IS LOCKING UP THE VEHICLE AND SEAT BELTS LOCK UP SQUEEZE MY WIFE UNEXPECTEDLY. DEALOR CANNOT FIND ANYTHING WRONG WHEN RUNNING DIAGNOSTICS AND WILL NOT REPLACE THE MODULES THAT CONTROL THIS FEATURE WITHOUT THEM SHOWING BAD. THIS HAS HAPPENDED ON THE SAME ROAD ON MULTIPLE OCCASIONS.

WE HAVE OWNED OUR XC90 SINCE NOVEMBER 11, 2017. THE BRAKES WERE SQUEALING WHEN BRAKING IN NORMAL CONDITION(S), NO RAIN ON ROAD OR WATER ON BRAKES WHETHER WE WERE DRIVING ON CITY STREETS, HIGHWAYS OR FREEWAYS. VOLVO SERVICE TECHNICIANS HAD TO REPLACE ALL 4 ROTORS AND BRAKE PADS ON 30 MARCH 2018, JUST A LITTLE OVER 4 MONTHS OF OWNING THE VEHICLE. FOUR MONTHS LATER 8 AUGUST 2018, VOLVO SERVICE TECHNICIANS HAD TO REPLACE ALL 4 ROTORS AGAIN, BUT NOT THE BRAKE PADS. THERE IS NEARLY 25,000 MILES ON THIS CAR, WHICH NORMALLY ROTORS AREN'T TYPICALLY REPLACED UP TO 70,000 MILES. I UNDERSTAND THIS VARIES BASED ON DRIVING BUT TWICE IN 8 MONTHS FOR ALL 4 ROTORS IS INSANE. THEY ALSO FOUND ALL FOUR ROTORS EACH TIME WERE WARPED. WE OWNED A 2012 VOLVO XC60 FOR 5 YEARS AND NEVER HAD THE BRAKES OR ROTORS REPLACED DURING THAT ENTIRE TIME. SECONDLY A GRINDING SOUND IS COMING FROM THE SUNSHADE WHEN IT IS BEING OPENED OR CLOSED. OUR VEHICLE HAS BEEN IN THE SHOP SINCE 14 AUGUST 2018 WHERE THEY REPLACED THE SUNSHADE, ONLY TO HAVE TO REPLACE IT AGAIN 21 AUGUST 2018. WE WENT TO PICK UP THE VEHICLE AND THE GRINDING SOUND IS BACK AGAIN, WHICH NOW VOLVO WILL HAVE TO REPLACE THE SUNSHADE FOR A THIRD TIME. I AM A VOLVO CUSTOMER FOR LIFE, BUT THESE ISSUES NEED TO BE ADDRESSED AND FIXED FOR FUTURE MODELS. I AM THANKFUL FOR THE COURTESY VEHICLE DURING THIS TIME, BUT I REALLY WANT MY VEHICLE BACK. I ASSUME MY NEXT COURSE OF ACTION IF WE GET THE VEHICLE BACK A THIRD TIME WITH A DEFECTIVE SUNSHADE OR BRAKES IS LEMON LAW.