P0562 on Audi: How to Diagnose & Fix
System Voltage Low
4 Audi models · 5 documented issues · 1 critical · $150-$1,200 repair
P0562 on Audi by model: symptoms, diagnosis and fix
The Q8 e-tron can experience excessive 12V auxiliary battery drain when parked for extended periods. Despite having a large HV battery, the 12V system powers control modules, security systems, and connectivity features that remain active. A software bug can prevent modules from entering sleep mode, draining the 12V battery in 3-5 days of sitting. This leaves the vehicle unable to be unlocked or started.
Common Symptoms
- Vehicle will not unlock with key fob after sitting 3-5 days
- Dashboard shows 12V battery warning on startup
- Multiple module fault codes after jump-starting
- Connected services (myAudi app) show vehicle offline
- Clock resets to incorrect time
How to Fix
Update the vehicle software to the latest version which includes revised module sleep timing. If the 12V battery has been deeply discharged multiple times, it may need replacement as lead-acid batteries are damaged by deep discharge cycles. Connect a 12V trickle charger if the vehicle will sit for more than a week.
Sources for this issue (1)
The 12V auxiliary battery drains if the vehicle sits for more than a few days. Multiple electronic modules fail to enter proper sleep mode, causing parasitic drain exceeding 50mA. Software-related in most cases.
Common Symptoms
- Dead battery after sitting 3-5 days
- Vehicle won't unlock with key fob
- Infotainment slow to boot
- Multiple warning messages on startup
How to Fix
Update vehicle software to latest version via dealer. If drain persists, have dealer perform parasitic draw test to identify module staying awake. 12V battery replacement with AGM type may be needed if battery was deeply discharged.
Sources for this issue (1)
The e-tron's 12V AGM auxiliary battery powers everything the driver touches before the high-voltage system wakes: door locks, the MMI, the gateway and the HV contactor circuit. The DC-DC converter only tops the 12V up while the vehicle is awake, and the high-voltage pack stops supporting it once state of charge drops low, so a car parked for two to three weeks - or one with any added parasitic load such as a hardwired dashcam in parking mode - can drain the 12V flat. The result is a car that will not wake at all: key fob does nothing, dash stays black, and the HV system cannot be closed regardless of how much charge is in the traction pack. Owners who catch it early report a '12V battery: charge low', 'Start system fault' or 'Electrical system currently limited, drive with greater care' message in the days beforehand. A weak 12V is also a common root cause of unexplained MMI glitches that vanish once the battery is replaced, so it should be ruled out before chasing infotainment faults.
Common Symptoms
- '12V battery: charge low' warning message
- 'Start system fault' message
- 'Electrical system currently limited, drive with greater care'
- Vehicle completely dead - no dash, no lock response, key fob inoperative
- Random MMI and infotainment glitches that resolve after 12V replacement
- Car will not enter Drive despite a well-charged high-voltage battery
How to Fix
Replace with a correct-specification AGM battery - not an SLI/flooded or standard sealed lead-acid unit, which will not survive the EV's shallow-cycle duty. Coding the new battery to the energy management module is required so the charging strategy matches the battery type. If the car is dead, jump or trickle-charge at the underhood jump terminals to wake the low-voltage system, then let the DC-DC converter recharge it on a normal drive. For cars that sit, use a maintainer or leave the vehicle plugged in - a plugged-in e-tron keeps the 12V supported. Audit aftermarket accessories first: dashcam parking mode is the single most-reported cause in owner threads. Battery and coding runs roughly $250-$500; parasitic-draw diagnosis adds $150-$300.
Sources for this issue (5)
- Hit by the dead 12v battery - Audi e-tron Forumforum
- 12-volt battery drain - Audi e-tron Forumforum
- 12V Car battery discharging - Audi e-tron Forumforum
- Electrical System currently limited, drive with greater care - Audi e-tron Forumforum
- 12v battery replacement (AGM vs SLI discussion) - Audi e-tron Forumforum
Multiple late-model Audi/VW MQB-derivative vehicles, including B9.5 A4s, have owner reports of repeated low-voltage warnings, dead batteries after sitting, and intermittent no-start conditions. The pattern is commonly linked to control modules not entering sleep mode properly, telematics/connectivity functions waking the network, or a weak AGM battery that tests marginal but repeatedly discharges. Owners typically report the car needing jump-starts after short parking periods and warning messages about electrical system malfunction or battery charge.
Common Symptoms
- Battery low warning
- Vehicle will not start after sitting
- Repeated need for jump-starts
- Electrical system malfunction message
- Intermittent warning lights after low voltage
How to Fix
Diagnosis should begin with battery state-of-health testing, charging-system verification, and parasitic draw measurement after the vehicle is allowed to sleep. Dealers often update software for gateway/telematics modules, check for excessive quiescent current, and replace the 12V AGM battery if it fails load testing; battery registration/coding is required after replacement. If draw remains high, scan all modules for wake-up faults and inspect accessories such as dashcams or OBD devices.
Sources for this issue (1)
NHTSA campaign 25V125 / Audi 93FR covers certain 2024-2025 Q4 e-tron and Q4 e-tron Sportback vehicles. The on-board charger can fail and stop charging the 12-volt battery, which can lead to loss of drive power and increase crash risk. Eligibility is VIN-specific; this does not support the former universal sensor, relay, battery or software-glitch diagnosis.
Common Symptoms
- Electrical-system warning
- 12-volt battery is no longer charged
- Loss of drive power
How to Fix
Check the VIN and campaign-completion history with Audi or NHTSA. The free remedy replaces the on-board charger. If the vehicle warns of an electrical-system fault or loses drive power, move out of traffic safely and arrange Audi recovery/inspection; do not buy a 12-volt battery or generic electrical parts from this summary.
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 Audi?
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 Audi it is documented across 4 models: Q8 e-tron, e-tron, A4, Q4 e-tron.
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 Audi?
Published repair estimates on Audi range from $150 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.