2016 Subaru Outback: battery drain or dead battery

Filed Apr 13, 2026 · Electrical · PA

Parasitic battery drain due to a faulty DCM module. I've purchase 3 batteries in the past 16 months. I now have to keep a trickle charger on my car at night to ensure my battery is not dead in the morning. Unable to park overnight without charger due to fear of another dead battery.

Filed Apr 7, 2026 · Electrical · VA

The DCM (Data Communication Module), also referred to as the Starlink telematics module, has failed. This failure is causing a continuous parasitic battery drain, which rapidly depletes the vehicle’s battery even after charging or replacement. The component remains installed in the vehicle and is available for inspection upon request. The failure has resulted in repeated battery drain and loss of vehicle operability. I have experienced a dead battery approximately 4–6 times between September 2025 and present, and the condition has worsened to the point where the vehicle cannot remain running or operable without the battery dying within approximately 5 minutes. This creates a safety risk because the vehicle can become inoperable without warning, increasing the likelihood of being stranded in unsafe conditions or unable to use the vehicle in an emergency. Yes, the issue has been diagnosed and confirmed by a Subaru dealership, which identified the DCM module as failed and requiring replacement. The failure is consistent with a parasitic battery drain caused by the DCM. The vehicle has been inspected by an authorized Subaru dealership.I have also contacted Subaru of America and opened a case requesting assistance with the repair. The primary symptom was repeated battery drain and failure to start beginning around September 2025. The issue progressed over time, with multiple instances of a dead battery, and has now worsened to the point where the battery drains within minutes, preventing normal vehicle operation. There were no consistent warning lights directly identifying the DCM as the cause prior to diagnosis.

Filed Dec 31, 2025 · Electrical · MI

I purchased a replacement battery in 2023. In August of 2025, the battery died, requiring a jump start. A local auto parts store checked the battery and it tested within acceptable limits, showing around 513 amps. A private shop confirmed this, and cleaned the battery terminals and cables. The battery functioned well until around November 2025, when it again died requiring a jump start. The battery again died in December 2025, about one month later, requiring a jump start.

Filed Jul 18, 2025 · Electrical · TN

Eye sight goes out shortly after reconfiguration (has happened several times), brand new battery has been drained causing complete shut down, has been in shop for six weeks and dealership cannot find reason for this happening and has replaced battery and driven the car waiting for a replica to happen. My research leans toward dcm/ECM/parasitic battery drain issues but there does not seem to be a recall for these electronic issues.

Filed May 24, 2025 · Electrical · IA

Known battery drain likely from DCM and also they designed the alternator not to completely charge battery causing frequent dead battery without warning and for no operator error and causing frequent need to replace car batteries over the years.There was a class action lawsuit but no recall for these issues so has not been addressed properly.

Filed Feb 26, 2025 · VA

The 8 month old battery on my 2016 Subaru Outback just died. I understand that the warranty on the DCM was extended by a year, but the dealership said that if it turned out the DCM was not defective, I would have to pay for the test ($185) . The warranty only covers having the battery recharged or replaced. If the DCM is the cause of the battery drain, than the warranty should pay for replacing the DCM, in addition to replacing the battery. Otherwise the problem will continue to reoccur. There should be a recall on the DCM!

Filed Jul 10, 2024 · Driver assistance, Electrical · VA

My 2016 Subaru Outback has gone through 5 batteries since purchase in 4/2016. The reason for my contact with you is that the Navigation function “eyesight” has been problematic for at least two years and began with the third of five batteries. The function stops working randomly at any hour of the day and in all conditions. This year it went off and on in excess of 300-400 times. Each time it stops, cruise control, lane warnings, etc. are off. This can be harrowing with highway driving. On the three occasions I took it to the dealer the past two years they could not find a cause. After I replaced the battery again recently, they reset a DCM whose warranty had been extended by Subaru and that I brought in myself. There have been a number of parasitic drain tests, some finding a drain, others not on the batteries When the car was returned to me, the navigation system went off only once that same day but I presume it will go off in the future. I do not find the car or system reliable. The problem appears to be exceedingly hard to diagnose. Since these are the types of systems used with automatic and self driving car functions, I thought it important that you be made aware of the hazards these systems present.

Filed May 6, 2024 · Electrical · MA

The battery is dying very quickly The DCM Data Communication Module is draining the battery causing the vehicle to become stranded This is the fifth battery in this vehicle Subaru is aware of this issue but refuses to find a solution to fix it

Filed Jan 25, 2024 · Electrical · NJ

Since owning this new Subaru vehicle, I have replaced the battery once. Today I had the car towed to the dealer with them diagnosing the car telling me it needs a certain module that has been draining the battery. Due to this problem, I have had to take an Uber to work. When the vehicle would not start, I had AAA come out and was told that the battery had 13% power on the one call out and 20% on the second call. In speaking with the tow truck driver for AAA he told me that this battery problem has been going on for a while with the 2015 to 2020 Subaru's. Now the dealer wants to charge me nine hundred and fifty-eight dollars to replace the module. If there was a problem with the module, why was I not told sooner about it? It seems to me that the factory battery is not strong enough to hold a charge and they are blaming it on the module. There were no warnings or messages telling me there was a problem with the battery.

Filed Dec 14, 2023 · Electrical · IN

Dead battery issues and DCM battery issue

Filed Oct 14, 2023 · Electrical · MI

We have had multiple incidents on this MY16 Subaru Outback draining the battery over the past several years. Sometimes the battery is dead after a couple or few days of driving. There seems to be a battery / electrical management (current draw when vehicle if off) issue as noted in multiple incidents and there was even a class action lawsuit. The SW update associated didn't resolve the issue. One can find many others with similar problems with Subaru Outbacks. (note: our MY17 Crosstrek also is experiencing the same issues). We have changed multiple batteries, needed multiple battery charges, required to buy a battery charger, buy a multimeter, and still have continued issues. Subaru corporate and the local dealership have done little/nothing to resolve the continued issue which causes disruptions in personal schedules, and just hope we don't have a dead battery/vehicle in a dangerous situation.

Filed Jul 4, 2023 · Electrical · GA

Something is draining the battery when the car is not in use. This left me stranded and that is a safety issue. On 12/01/21 I had a new battery installed at the Subaru dealership. The battery wasn't dead at the time but I had the car long enough that I thought it was time for a replacement. Late last year my husband took the car for an emission inspection and when they turned the car off, it wouldn't start and they had to boost it off and the same thing happened a few times when the car was parked in the garage I took it to the dealership and they said they were unable to make the battery fail so they could not replace it at no charge. I had them check more items and they said everything was fine. We bought a new battery 3/17/23 and exactly 3 months later it was dead again. From reports online people seem to think it's the starlink system. At the time they had to have an upgrade, I took the car to the dealership twice to upgrade 3G in starlink and Starlink never worked again. There are no warning lights, the battery just dies.