2019 Subaru Outback - Parasitic Battery Drain - Dead every morning

Question

If I don't drive my Outback for a day, I have to jumpstart it. The battery is only 6 months old. I performed an ammeter draw test and found a 350mA draw after the car went to sleep, which is way too high.

I started pulling fuses and the draw drops to 20mA when I pull the DCM (Data Communication Module) fuse. But if I leave that fuse out, my microphone for hands-free calling doesn't work. Is there a way to fix this without leaving the fuse out?

MountainMechMo · Accepted Answer

✅ Confirmed fix: The Starlink DCM was stuck trying to connect to a 3G tower that no longer exists, preventing the module from entering sleep mode. The fix was a firmware update at the dealer followed by a 'power cycle' procedure. If the module is non-responsive to the update, the DCM must be replaced or bypassed with a jumper harness.

DefDeleteDan_NO · Answer

Check the rear hatch latch. There is a common issue where the 'gate open' sensor stays active and keeps the CAN-BUS awake. Even if the light isn't on, the signal can keep the computers from timing out.

2019 Subaru Outback - Parasitic Battery Drain - Dead every morning

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