P0562: System Voltage Low
Updated November 12, 2026
The engine computer measured supply voltage below the normal range for a period of time. It usually points to a weak battery, a charging system problem, or a bad connection.
COMPZA may earn a commission when you buy through links on this page, at no extra cost to you. How we make money.
🔧 Want to check this yourself? An OBD2 scanner reads the code; models with live data also show the sensor readings used in the checks below. See code readers and scanners from $24.99 ↓ · Which scanner do I need?
Common causes
- A weak or failing battery
- A failing alternator or voltage regulator
- Loose or corroded battery terminals or ground straps
- A worn or slipping drive belt
Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.
Symptoms
- Battery or charging warning light
- Dim lights or flickering dash
- Slow cranking or no start
- Odd electrical behaviour
Is it safe to drive?
Get it checked quickly. If the charging system has failed, the car can stall once the battery runs down.
How to check it with a scanner
- Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
- With the engine off, a healthy battery reads about 12.6 volts. With the engine running, most charging systems read about 13.5 to 14.7 volts.
- Clean and tighten battery terminals and check the main ground straps.
- Many auto parts stores will load test the battery and alternator.
- After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.
A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.
Code readers and scanners in stock
From partner stores' live product feeds. Check that the tool covers your vehicle's make, model and year on the retailer's page before you buy.
LAUNCH CR319 OBD2 Code Reader & Emissions Readiness Tester$24.99at LAUNCH X431 Online 
LAUNCH CR529 OBD2 Code Reader with Live Data Stream$45at LAUNCH X431 Online 
Autel MaxiLink ML529$52at AUTELOnline 
AutoLink AL319$59at AUTELOnline 
MaxiAP AP2500E$60at AUTELOnline 
LAUNCH Creader VII+ Code Reader for Engine, ABS, SRS & Transmission$119at LAUNCH X431 Online Affiliate links. AUTELOnline prices updated Nov 14, 5:26 PM EST · LAUNCH X431 Online prices updated Nov 14, 4:18 PM EST.
Search eBay for your vehicle
Affiliate links: COMPZA may earn a commission from qualifying eBay purchases at no extra cost to you. Add your vehicle in eBay's parts finder to see parts that fit.
Questions
What does P0562 mean?
P0562 is the generic OBD2 code for "System Voltage Low." The engine computer measured supply voltage below the normal range for a period of time. It usually points to a weak battery, a charging system problem, or a bad connection.
Is it safe to drive with P0562?
Get it checked quickly. If the charging system has failed, the car can stall once the battery runs down.
How do I check P0562 myself?
Read the code and freeze-frame data with an OBD2 scanner, then: With the engine off, a healthy battery reads about 12.6 volts. With the engine running, most charging systems read about 13.5 to 14.7 volts. Clean and tighten battery terminals and check the main ground straps. Many auto parts stores will load test the battery and alternator.
Related codes
📬 Get the weekly deals email
One email a week with the best current deals from our partner stores: home, kitchen, tech, car and gifts. No spam, unsubscribe anytime.
Emails include affiliate links; COMPZA may earn a commission at no extra cost to you. See our privacy policy.