2016 Subaru Outback Electrical System Problems

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.

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.

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.

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.

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.

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

Front Passenger Side window will not roll down. The electrical button on the driver's side is not functioning to allow it to roll down. This was a similar problem with the back passenger side window which was taken care within the first year of purchase.

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.

Dead battery issues and DCM battery issue

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.

Ignition key cannot be removed quite frequently. It requires restarting engine, jiggling shift lever to finally release. I see a Subaru TSB 16-112-18R has been released for this issue.

My key keeps getting stuck in the ignition, and forced me to have to leave the key in the car while I went in to a store, when i got back someone was in my car. I realize that this is a different type of safety issue, but it truly is a safety issue. I am having to leave my key in my car everywhere i do because it doesn't come out,, eventually it will come out randomly but not everytime I shut the car off. this should be a recall issue for Subaru's that have this problem. I have read many complaints about Subaru owners with this issue happpening to them. I am not the only one. Thank You!

Car has has 4 new batteries since I bought it new. Had to have this car jumped at least 12 times and some times at night late in downtown Portland where I have not been in a safe location. Once in the snow after hiking to come back at dusk with only one person around at trailhead. Got lucky the jumpstart worked. Apparently today after having it towed to a shop before we take a 9 hour road trip, the mechanic found that it is the voltage regulator in the alternator. Apparently a known issue with Subaru. Ridiculous that I have spent probably over $1000 or more on this issue, and been stranded multiple times and inconvenienced family and friends on this issue countless times.

The software is designed not to allow the alternator to charge the battery fully. Subaru was made aware of this issue and came out with a software update which they are charging $200 for. This is a defect that causes the car to die every time the car is turned off, they should be updating the software for free.

The contact owns a 2016 Subaru Outback. The contact stated that while attempting to turn off the vehicle, the key failed to release from the ignition switch. There were no warning lights illuminated. After approximately twenty minutes, the contact was able to remove the key. The contact called the local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 23,000.

Key remains stuck in ignition upon putting vehicle in park and shutting vehicle off. Failure comes from faulty switch in the selector lever assembly. Unable to remove key from vehicle for several minutes at a time. Failure acknowledged in TSB 16-112-18R

2016 Subaru Outback has a flawed electrical system that drains the battery. We are on our 3rd battery. Prior to a road trip in Nov. 2022 we had our car fully serviced. Day two of the road trip we had a dead battery. Got a jump and had a new battery installed at Reno Subaru dealership. We went on another 7 day trip in Jan. 2023, left our car at the airport only to return to another dead battery that is less than 2 months old. After doing a little research and making several calls to the Reno dealership and our hometown dealership, we now understand there is a serious problem with Subaru's electrical system. Even newer models will experience the same issue if left sitting for several days. This has been a known issue for years and presents serious personal safety issues for Subaru owners. Especially if you find yourself stranded in a dark parking garage late at night! Shame on Subaru!

Per my subaru code for checking a depleting battery after not using vehicle for 3 days and then not being able to start car without a jump they said i would owe $29 to check battery as it was not a subaru battery. The code i received is sb37469152. After checking battery which checked out ok their solution to my problem is to buy a battery tender and plug it in after i go someplace. I am 93 years and don't go out everyday so this is a real problem. Never heard of such a issue. UNBELIEVABLE

THE BATTERY is completely unreliable - I have had 3 batteries since I purchased the car in 2015 - REPEATED RECURRENT DISCHARGE WITHOUT APPARENT CAUSE - SUCH AS LIGHTS LEFT ON - PARASITIC DRAIN IT SEEMS In recent research have discovered this is not a new issue and there is a class action lawsuit settlement - I did not exclude myself and somewhat now wish that I had, in order to attempt to get some buy back incentive from Subaru. Beginning in 2019 - and maybe prior though I had not recognized it as a chronic issue then - I have encountered recurrent issues of complete battery discharge after time periods ranging from 5 to 24 hours. Estimate at least 1 to 2 discharges per month requiring cable jump, and many more times when the car was very difficult to start (almost fully discharged) To minimize risk as consumer I have bought a HALO Bolt - but Subaru should be held accountable to fixing primary cause of this chronic issue for so many of us.

There is a great possibility of being stranded with this car. And in winter weather, it could be deadly. The car is draining the battery abnormally quick. I have a less than 1 yr old battery and if my car sits a day or two the battery goes dead. The battery will take a charge and then work, but then is drained in a day or two. I have also read there is something going on with the CAN system in these cars. Please help if you can. Thank you.