P0562 on BMW: How to Diagnose & Fix
System Voltage Low
5 BMW models · 5 documented issues · 1 critical · $200-$3,000 repair
P0562 on BMW by model: symptoms, diagnosis and fix
The BMW i3 is notorious for 12V auxiliary battery drain. Despite having a large high-voltage traction battery, the 12V AGM battery that powers the car's electronics can drain overnight or over a few days of sitting. The issue is caused by various modules failing to enter sleep mode, particularly the telematics and connectivity modules.
Common Symptoms
- Car won't start after sitting
- Dashboard warning lights on startup
- Reduced range displayed
- 12V battery warning in iDrive
- Door locks don't respond to key fob
- Charging interrupted
- Random module resets
How to Fix
Replace the 12V AGM battery with a fresh unit (OEM or high-quality AGM). Code the new battery using ISTA or BimmerCode to register it with the IBS (Intelligent Battery Sensor). Check for software updates that address module sleep behavior. Some owners install a battery tender for long-term parking.
Sources for this issue (1)
The BMW iX3 can experience premature 12V auxiliary battery drain, particularly when the vehicle sits unused for extended periods. The always-on telematics, remote connectivity features, and background software processes draw parasitic current from the 12V battery. When the 12V battery voltage drops too low, the vehicle may fail to power on, refuse to unlock, or display multiple warning messages. This is a common issue across BMW's electric vehicle lineup due to the high parasitic draw of connected services.
Common Symptoms
- Vehicle fails to unlock or power on after sitting for several days
- Multiple warning lights and error messages on startup
- Remote start or BMW Connected app functions failing
- Clock resetting to incorrect time
- Infotainment system taking excessively long to boot
How to Fix
Replace the 12V AGM battery with an OEM-specification unit. If the vehicle will sit unused for more than 5-7 days, connect a BMW-approved battery tender. Disable unnecessary connected services in the iDrive settings to reduce parasitic drain. Have the dealer check for software updates that optimize sleep mode power management.
Sources for this issue (1)
The BMW iX uses a 60Ah AGM 12V battery that powers all vehicle electronics. Owners report the vehicle dying after several days of parking with the 12V battery completely dead while the main HV battery retains charge. The iX has components that cause phantom drain regardless of settings because the vehicle must always be ready to power on, and the 12V battery may last only 2 years in some cases. Software bugs can prevent proper sleep mode, keeping modules active and draining the 12V. The iDrive 8 system not entering sleep mode is a documented cause. Failed or stuck TCB (telematics) modules attempting constant cellular reconnection also contribute to drain. The DC-DC converter should maintain 12V charge from the HV battery during normal operation, so persistent drain indicates a software or hardware fault.
Common Symptoms
- Vehicle dead after sitting for 2-5 days despite full HV battery
- 12V battery voltage warning on instrument cluster
- "Battery discharge" warning message
- Remote app functions stop responding (BMW Connected app)
- Exterior lamps staying on after car is locked (sleep mode failure)
- Key fob won't unlock vehicle (12V too low for receivers)
- Multiple system errors cascade on startup after 12V recovery
How to Fix
First ensure latest software is installed - BMW has released OTA updates addressing sleep mode bugs. If 12V battery has been deeply discharged, it may be permanently damaged and need replacement. Use a BMW-approved battery tender for vehicles parked for extended periods. Dealer can perform a sleep current test to identify which module is preventing proper shutdown. If CCU (Central Charging Unit) is malfunctioning, it may need replacement under warranty. For battery replacement, part number for 60Ah AGM may include 01405A38CB9. Must be registered to IBS via BimmerLink or dealer ISTA.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine BMW 60-Ah AGM battery 61217604802Cross-ref61217604802
Confirmed failed iX 12-volt battery replacement. Confirm VIN, production data and the required BMW battery-registration procedure before ordering..
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
The i5 (both eDrive40 and M60 xDrive) uses a small 12V auxiliary battery to power the vehicle computer systems, door locks, and startup sequence. Like other BMW EVs, the i5 can experience excessive 12V battery drain when the car is parked for extended periods (more than 3-5 days). Multiple connected services modules continue drawing power even in sleep mode, depleting the 12V battery. A dead 12V battery renders the car completely inoperable — you cannot open the doors, shift out of park, or engage the main HV battery.
Common Symptoms
- Car will not unlock with key fob after sitting several days
- Drivetrain Malfunction warning on first startup
- iDrive screen fails to boot or shows errors on startup
- Multiple warning messages after jump-starting the 12V battery
- Connected services features disconnecting intermittently
How to Fix
Keep the i5 plugged in when parked for extended periods — the HV charger trickle-charges the 12V battery. Install a BMW-recommended battery maintainer connected to the 12V battery (accessible in the right side of the trunk). Update iDrive software to the latest version — BMW has released OTA updates that improve sleep-mode power management. If the 12V battery dies, the manual release cable under the hood allows emergency access.
Sources for this issue (1)
The BMW i8's hybrid architecture creates complex interactions between the 12V auxiliary system and the high-voltage (HV) system. The 12V battery drains when the vehicle sits for extended periods, and unlike a simple ICE car, a dead 12V on the i8 prevents all HV system access - the car cannot charge, start, or drive. A critical but obscure failure mode involves a small safety connector wire under the red 12V battery terminal cover that acts as a crash/rollover sensor to cut HV power. This wire is frequently accidentally disconnected during 12V battery replacement, causing the car to show "DRIVETRAIN NO RESTART" and refuse to charge or drive. The i8's complex data bus means a weak 12V battery causes cascading errors across all vehicle systems. The alternator/generator system can also fail, preventing proper 12V charging.
Common Symptoms
- "DRIVETRAIN NO RESTART" warning on dashboard
- Vehicle won't charge from any source (AC or HV)
- Vehicle won't start or enter Drive Ready mode
- Multiple cascading error messages on startup
- HV battery slowly discharges while vehicle sits
- Warning lights for systems that have no actual fault
- Remote functions (app) stop responding
- Battery discharging while stationary warning
How to Fix
For 12V battery replacement: Use BMW-spec AGM battery and ENSURE the small black safety wire under the red terminal cover is reconnected - this is the #1 cause of post-replacement "Drivetrain No Restart" errors. Register new battery via dealer ISTA tool. For HV battery discharge: If the HV battery fully depletes and 12V dies, the car may need dealer-level tools to restart the HV system. Preventive: Use a quality battery tender when vehicle will sit for more than 1 week. Check that all modules are sleeping properly (dealer can run a sleep current test). For alternator/charging system faults: Full electrical diagnosis required at BMW dealer or specialist.
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 BMW?
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 BMW it is documented across 5 models: i3, iX3, iX, i5, i8.
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 BMW?
Published repair estimates on BMW range from $200 to $3,000 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.