2018 Subaru Forester electrical system problems

“On July 31, 2026, I was driving with my daughter when the a/c compressor clutch seized up and experienced a catastrophic compressor failure that also blew out the expansion valve o-rings. The failure led to a total loss of engine power and control of the vehicle. The car would not start back up because the clutch was seized and the pulleys wouldn’t turn. Luckily, I was in a residential neighborhood and cars were able to safely go around me. If this had happened on a highway or faster speed limit zone there could have been fatalities. There were tons of lights all over the dash as I attempted to restart the engine. The engine wouldn’t turn over until I gave it plenty of pedal pressure. This extra power to the engine during ignition freed the seized clutch and I was able to drive home without air conditioning. I parked outside in the driveway due to a strong odor of burning metal (probably clutch) when we arrived home. Several years earlier I had completed a Subaru recall WRB-21 for the condenser, and I believe this is directly related to the failure. Subaru of America denied my request for goodwill repair claim under claim 260810-210789 and won’t recognize this…”

“Airbag light came on - dealership confirmed it is an occupant detection system failure - wiring harness has gone bad. No history of moisture exposure, which would leave faulty part as the problem. Similar to Subaru recall from 2020 on heated passenger seats - this vehicle was not included in that recall, but is in the same year range and has heated seats. Entire bottom piece of front seat must be replaced, including wiring harness and seat mounting bracket; otherwise air bags may not deploy in case of accident. Quick online search reveals this problem has been prevalent in other 2018 Foresters not included in the original recall.”

“I brought my vehicle to an authorized Subaru dealership (Byers Imports, LLC in Columbus, Ohio) to diagnose the reason for the airbag warning lamp illuminating. The dealer had the manufacturer's WUM-98 Safety Recall (NHTSA Campaign Number 19V701000) performed to remedy a defective Occupant Detection System (ODS) sensor harness.Despite the recall remedy being completed, the Supplemental Restraint System (SRS) airbag warning light re-illuminated on the dashboard, completely disabling the front passenger-side airbag.The dealership confirmed that the passenger-side airbag remains completely disabled and inoperable due to a hardware failure of the internal occupant detection sensor mat. Because the initial WUM-98 recall was previously marked as "closed" in Subaru's automated system, the manufacturer refused to cover the repair under the recall. I was forced to pay $1,258.34 out of pocket up front to order a replacement front passenger seat cushion assembly (Part #64139SG061LL) to restore basic airbag safety to the vehicle.The initial federal safety recall remedy failed to permanently correct the underlying safety hazard. The vehicle continues to exhibit the exact…”

“June 2025: I proactively replaced the battery October 2025: Left the car parked for 17 days. Dead battery. Got a jump, drove for 2 hours. May 2026: Left the car parked for 10 days. Dead battery. Got a jump, drove to mechanic who replaced it under warranty. Saw article about Subaru class action lawsuit about this issue, so I'm reporting it. I will visit the Subaru dealer where I purchased to car and ask them about it and Subaru's plans for permanent repair.”

“Airbag light comes on due to some failure in the passenger seat. This vehicle year has had a recall on the same issue but this VIN number was not included for some reason. Another consumer posted his assessment which I have attached. My vehicle falls under his category. He has sold his since his was never resolved.”

“The defect presents itself when the equipped data communications module (DCM) attempts to communicate with 3G cellular networks. As 3G networks within the U.S. are no longer functioning, the call will continuously fail even after the vehicle has been turned off, draining the battery and resulting in a no-start safety risk for drivers but in order to replace the DCM to the 4G it will cost upwards of $2000.”