P0562 on Volkswagen: How to Diagnose & Fix
System Voltage Low
1 Volkswagen model · 2 documented issues · 2 critical
P0562 on Volkswagen by model: symptoms, diagnosis and fix
The ID.4 suffers from 12V auxiliary battery drain, leaving the vehicle unable to start despite having a fully charged high-voltage battery. The 12V battery powers the vehicle's computers, door locks, and startup systems. Parasitic drain from always-on modules (telematics, battery management) depletes the small 12V battery, especially if the vehicle sits for more than a few days. VW issued a software update to improve 12V battery charging management, but the issue persists for many owners.
Common Symptoms
- Vehicle will not start despite charged main battery
- Key fob does not unlock doors
- Dashboard shows 12V battery warning
- Infotainment does not boot
- Vehicle stuck in Park
- Multiple warning lights on startup
How to Fix
Update to the latest vehicle software (ID. Software 3.x or later) which improves 12V charging management. If the 12V battery is already dead, jump-start using the under-hood 12V terminal. Replace the 12V battery with the correct replacement for the vehicle (factory fit is an approximately 49Ah EFB+ battery; an AGM upgrade must be coded to the vehicle). Check by VIN for open recalls such as 25V125 (VW 93CJ), where a failed on-board charger stops charging the 12V battery. If the vehicle sits for extended periods, use a trickle charger on the 12V battery or drive the vehicle at least once a week.
Sources for this issue (3)
Condensation can form inside the Onboard Charger with integrated DC/DC converter (OCDC, a Bosch-supplied unit) because the printed circuit board lacks sufficient protective conformal coating. Moisture causes electromigration on the PCB and the OCDC fails, so it can no longer charge the 12-volt battery from the high-voltage pack. The result is non-start conditions, and if driven until the 12V battery depletes, a loss of motive power and electronically assisted functions. This is a hardware charger failure, separate from ordinary 12V auxiliary battery drain. NHTSA recall 25V125 covers MY2024 ID.4 (and related Audi Q4 e-tron).
Common Symptoms
- 12V battery low / electrical system fault warnings
- Vehicle will not start
- Reduced driving functions message
- Loss of motive power if driven until 12V depletes
- DC/DC converter / charger fault
How to Fix
Covered by recall NHTSA 25V125. Dealers replace the OCDC unit free of charge. Drivers who see repeated 12V/electrical warnings and audible alerts should not keep driving until the battery depletes; have the OCDC replaced.
Sources for this issue (3)
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 Volkswagen?
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 Volkswagen it is documented across 1 model: ID.4.
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 Volkswagen?
Repair costs vary widely with the root cause and Volkswagen model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.