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.

At first I was having issues with stop and start, replaced the battery then was told I wasted coffee in my center Console and it cause electrical issues and was told the repairs would be 3,400 in which collision issuance paid for. After the repairs my driver side seat belt would latch then the passenger side wouldn’t latch either so I currently don’t have working A/C or working seatbelts which is known problem for these vehicles.

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 2018 Volvo XC90 T8 Plug-In Hybrid experienced a catastrophic, premature component failure of the Electric Rear Axle Drive (ERAD) propulsion system while driving. The ERAD unit suffered a total failure of internal bearings and sensors, completely disabling the electric rear wheel propulsion system and suddenly forcing the vehicle into a reduced-power "limp mode" on the road. This sudden loss of hybrid propulsion creates an immediate highway safety hazard, removing expected acceleration and vehicle control in traffic. Volvo has documented this exact engineering flaw internally under Technical Journal TJ 36665, recognizing a manufacturing vulnerability in these specific hybrid components. However, the manufacturer is refusing to provide remedy or financial cost-sharing to repair this vital propulsion and safety defect, leaving a hazardous, compromised vehicle on the road.

2018 Volvo XC90, VIN [XXX] , 54,618 miles. Original owner. All service performed exclusively at Volvo Cars West Houston (same dealer, all three failures). Volvo Technical Journal TJ 34648.1.2, titled "Prior Approval - Lack of airflow causing poor cabin cooling," is classified as a Product Fix and explicitly lists the 2018 XC90 as an affected vehicle. This TJ required the dealer to submit a Prior Approval report to Volvo Corporate when installing the resistor fix. At 12,017 miles (August 2020), the dealer installed the evaporator resistor per TJ 34648.1.2, Part No. 32241228, under VST Operation 98734-2 — meaning Volvo Corporate has documentation of this vehicle's evaporator vulnerability on file since 2020. At 15,930 miles (March 2021), the AC compressor failed and was replaced under warranty, consistent with refrigerant starvation from the same underlying evaporator leak. The evaporator has now failed completely at 54,618 miles despite Volvo's own corrective measure being applied at 12,017 miles. The current failure (April 2026) includes a confirmed front evaporator refrigerant leak and AC discharge hose leak, documented by dealer borescope inspection showing corrosion on the evaporator fins and visual evidence of refrigerant oil residue at the discharge hose fitting. Dealer repair estimate is $4,406. This is a documented pattern failure across 2016-2018 Volvo XC90 models. Volvo Cars USA was contacted for goodwill assistance and denied the request within 24 hours without meaningful review. Case number [XXX]. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

3 weeks ago we had the transmission module fail on our vehicle while it was being driven. According to Volvo forums, this is a multi-model year, multi vehicle issue for those with sunroofs. Accrding to the dealer in our case, the seal failed, and water runs into the compartment where the transmission module is located, causing it to fail. We had it happen twice, and both times on the highway, with the engine running ragged causing it ot accelerate and then quickly decelerate. There were 3 warnings that popped up-"Gear lever locked," "transmission acceleration performance reduced," and "Parking Brake unaavialble." It happened twice and and was towed to the dealer both times, as it was not drivable-once the vehicle was parked it would no longer move out of park. The first time the diagnosis and module reset was comped by the dealer (Borton Volvo, Golden Valley, MN) and the second time, the transmission module was "dried out," and the sunroof seal was replaced, which was just under $700. It is available to be inspected if necessary. The vehicle was a hazard to others on the road while it was "acting up." Dealer was familia with the issue. No inspection was done other than by the dealer Warning lamps as outlined above

While actively driving into an intersection, driving on the street and or stopped at a light or at a stop the vehicle will shut off, the lights on the dashboard will sometimes be on, other times go completely black, a notification pops up on the dashboard saying "engine not in P". There is no way I'm aware of to re create this action. My children's safety as well as mine has been put at significant risk and in harms way as well as others due to the severity and nature of this unexpected risk while driving on the freeway, through intersections and in general driving through traffic and busy streets. I've had multiple close calls of almost being hit when the car stopped while I'm driving with my children. The problem has yet to be reproduced by the dealer at this time however we have photos and video of it's ongoing safety concern. It has not been inspected by the manufacturer nor police but is currently at the dealer undergoing inspection. There has not been any notifications or warnings prior to any one of these serious events, the message only comes up when the car is off and won't go.

This morning and a few days ago, ice cold water was dripping onto my control display pad and on me. The leakage came from the ourside down the plastic compartment behind my rearview mirror. This was distracting while I was driving since there was now water on me, and it was shorting out and affecting my control display. It would continue to be buggy while driving. I believe this issue is a result from a cracked seal between the windshield and the car body. I have seen other documented cases on volvo forums.

The contact owns a 2018 Volvo XC90. The contact stated that after coming to a stop at a stop signal, the vehicle lost motive power. The contact stated that the vehicle was able to restart; however, the failure recurred. The vehicle failed to restart, and no warning lights were illuminated. The vehicle was taken to a local dealer, where it was diagnosed that the starter motor fuse needed to be replaced. The vehicle remained at the dealer awaiting the parts for the repair. The manufacturer was made aware of the failure. The approximate failure mileage was 101,000.