P0562 on Subaru: How to Diagnose & Fix
System Voltage Low
3 Subaru models · 3 documented issues · $250-$1,200 repair
P0562 on Subaru by model: symptoms, diagnosis and fix
Despite being an EV with a large high-voltage battery, the Solterra relies on a small 12V auxiliary battery to power control modules and enable the vehicle to 'start.' This 12V battery drains quickly when the vehicle sits for more than 5-7 days, or when various modules fail to enter sleep mode properly. A dead 12V battery means the vehicle cannot be powered on, doors may not unlock, and the charging port won't open - even with a fully charged main battery. Multiple software updates have attempted to address module sleep behavior.
Common Symptoms
- Vehicle won't power on after sitting 5-7 days
- Doors won't unlock with key fob
- Dashboard completely dead - no lights or displays
- Charging port lid won't open
- 12V battery warning message before shutdown
- Clock and settings resetting
How to Fix
Update to latest vehicle software - multiple updates address 12V battery management. If the 12V battery is dead, it can be jump-started from the 12V battery located under the hood (not the main HV battery). Install a trickle charger (CTEK MXS 5.0 or Battery Tender Plus) for extended storage. Subaru recommends driving or plugging in the vehicle at least once weekly. If 12V battery fails repeatedly, have dealer test and replace with updated AGM battery.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- CTEK MXS 5.0 12V Battery Charger and Maintainer
optional storage maintainer after compatibility confirmation, not a cure for parasitic drain Fitment/availability: 12-volt WET, MF, Ca/Ca, AGM, EFB or GEL lead-acid batteries from 1.2-110Ah for charging and up to 160Ah for maintenance; v…
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A well-documented issue on late-model Subaru vehicles including the Legacy involves parasitic battery drain tied to the Data Communication Module (DCM), telematics hardware, or related control modules not going to sleep properly. Owners report dead batteries after the vehicle sits overnight or for a few days, repeated jump-starts, and battery replacements that do not permanently solve the problem. This issue is reflected in Subaru service communications, owner forum threads, and NHTSA complaints.
Common Symptoms
- dead battery after sitting
- slow cranking
- no-start condition
- repeated need for jump-starts
- battery replacement does not fix issue
- intermittent warning lights after low voltage
How to Fix
Diagnosis requires a proper parasitic draw test after all modules should be asleep, with attention to the DCM/telematics circuit and battery condition. Repairs may include DCM replacement, software updates, battery replacement if damaged by repeated deep discharge, and verification that quiescent current drops to specification. Some vehicles also need charging-system and ground checks to rule out secondary causes.
Owner tips & cautions
- TipAsk the dealer to document parasitic draw in milliamps after sleep mode rather than only load-testing the battery.
- TipIf the battery has been deeply discharged multiple times, replacement is often needed even after the root-cause module is repaired.
Sources for this issue (1)
A recurring owner complaint on late-model Subarus including the VB WRX is premature battery discharge, leading to slow cranking or a no-start condition after the car sits for a short period. Owners often report the vehicle tests fine after a jump but repeatedly goes dead, especially in cold weather or with short-trip use. The issue appears tied to battery reserve capacity, charging profile, and occasional parasitic draw concerns rather than a single universal failed component.
Common Symptoms
- dead battery after sitting
- slow crank
- click no-start
- needs jump start repeatedly
- battery warning or low voltage behavior
How to Fix
Perform a battery load test and parasitic draw test after the vehicle has gone to sleep, and verify charging voltage under different loads. Many cases are resolved with battery replacement to a stronger AGM-compatible unit, software updates where applicable, or correcting an abnormal draw from accessories or modules. If the car is driven infrequently, a maintainer can prevent repeat failures.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- CTEK MXS 5.0 12V Battery Charger and Maintainer
optional maintainer for storage/infrequent use after abnormal draw is excluded Fitment/availability: 12-volt WET, MF, Ca/Ca, AGM, EFB or GEL lead-acid batteries from 1.2-110Ah for charging and up to 160Ah for maintenance; verify the inst…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipIf the car sits often, use a smart battery maintainer through the engine bay jump posts.
- TipAsk for a full parasitic draw printout instead of only a quick battery test if the problem is intermittent.
Sources for this issue (1)
P0562 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0562 mean on a Subaru?
P0562 stands for "System Voltage Low." P0562 means the engine computer detected that the vehicle's system (battery/charging) voltage is too low for normal operation. The computer constantly monitors charging-system voltage because nearly every sensor, injector, and module depends on a stable supply; sustained low voltage can cause erratic behavior and other false codes. This is most often a charging or battery problem — the alternator isn't keeping up, the battery is weak, or there's resistance in the cables/grounds. You may notice dim lights, slow cranking, or multiple unrelated warning lights. On Subaru it is documented across 3 models: Solterra, Legacy, WRX.
What are the most common causes of P0562?
The most common causes of P0562 are: Failing alternator or worn alternator brushes/regulator, Weak, old, or discharged battery, Corroded, loose, or damaged battery cables and terminals, Bad engine or chassis ground connections, Slipping, glazed, or broken serpentine/drive belt, High resistance in charging system wiring or fusible link, Faulty PCM voltage reference or charging-system control. The specific cause varies by vehicle.
How much does it cost to fix P0562 on a Subaru?
Published repair estimates on Subaru range from $250 to $1,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0562 on a different make?
View P0562 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.