System Voltage Low
Electrical · Charging System
The vehicle electrical system voltage is below the minimum threshold. Indicates a failing battery, failing alternator, or high electrical load. The vehicle may stall or fail to restart.
- Weak or failing batteryMost common
- Failing alternatorMost common
- Loose or corroded battery terminalsCommon
- Parasitic electrical drainCommon
Vehicles most commonly affected by P0562
System voltage low is most commonly reported on older BMW E46 and E90 series (IBS sensor failures causing false low voltage readings), Jeep Grand Cherokee and Wrangler (alternator failures at 80,000–100,000 miles), and any vehicle over 5 years old where the original battery is approaching end of life. Vehicles with high accessory loads (aftermarket audio, lift kits with additional lighting) are particularly susceptible.
Real-world P0562 diagnosis scenario
A 2013 Jeep Wrangler with 94,000 miles stores P0562 on a cold morning. Headlights are noticeably dimmer than normal. The original battery tests at 9.8 volts cranking — well below the 10.5V minimum for healthy cranking. The alternator output tests at 14.1V (normal). Battery replacement ($130–$200 for a quality AGM battery) resolves P0562 immediately. On Wranglers and other 4x4s used for overlanding with parasitic accessory loads, upgrading to a Group 34/78 AGM battery is recommended over standard flooded batteries.
Before replacing either the battery or alternator for P0562, test both components properly. A battery that reads 12.4V at rest but drops below 10V under load (crank test) needs replacement. An alternator that produces less than 13.5V or more than 14.8V at idle needs replacement. Testing both takes 10 minutes at any auto parts store — free.
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Frequently asked questions about P0562
What does P0562 mean?
The vehicle electrical system voltage is below the minimum threshold. Indicates a failing battery, failing alternator, or high electrical load. The vehicle may stall or fail to restart.
Is P0562 serious?
Fix soon — electrical systems may fail without warning.
How much does it cost to fix P0562?
Repair costs for P0562 range from $100 – $300 depending on the root cause and your vehicle.
Can I drive with P0562?
You can drive short distances but should have it repaired within 1–2 weeks to prevent further damage.
How do I know if it's the battery or alternator causing P0562?
Test the battery voltage at rest (should be 12.4–12.7V fully charged) and under load during cranking (should stay above 10.5V). Test alternator output at idle (should be 13.5–14.8V). Most auto parts stores will test both free of charge.
Can I drive with P0562?
With caution. System voltage low means electrical systems may behave erratically and the car may fail to start. Drive directly to a shop or auto parts store. Do not take a long highway trip.
How long do car batteries last?
Most car batteries last 3–5 years. In hot climates (Arizona, Florida, Texas), heat accelerates battery degradation and average life drops to 2–4 years. If your battery is over 4 years old and you are getting P0562, replace it proactively.