Battery Voltage Low
Indicates that the vehicle battery voltage is below the acceptable level.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The car’s computer is telling you that the battery’s voltage is lower than it should be, which can affect performance and cause starting issues.
What the computer is actually seeing
The vehicle’s computer monitors the battery voltage and expects it to be between 12.0 to 14.5 volts while the engine is running. If it drops below 11.5 volts, it triggers the B1568 code.
What a healthy reading looks like
Normal battery voltage should read between 12.4 and 12.6 volts at rest, and between 13.7 and 14.7 volts when the engine is running and the alternator is charging.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the battery terminals for corrosion and tightness. Clean and tighten as needed. Retest the system.
- 22. Use a multimeter to measure the battery voltage at rest (not running). Confirm it's between 12.4 and 12.6 volts. If not, replace the battery.
- 33. Start the engine and measure the voltage again. Ensure it reads between 13.7 and 14.7 volts. If it’s low, check the alternator output and wiring.
- 44. If all above checks out, inspect for high parasitic draw with a multimeter. Disconnect the negative terminal and measure the draw current. It should be less than 50 mA.
Common causes
- Weak or failing battery
- Faulty alternator
- Corroded or loose battery connections
- Parasitic draw from accessories or modules
Typical repair cost
$100-$300
Related codes
Frequently asked questions
Is it safe to drive with this code?
Driving is possible but may become difficult, especially in cold weather or after a few starts if the battery gets too low.
What happens if the code appears again?
If the code returns after repairs, it could indicate a deeper electrical issue or a fault with the charging system.
Why does this code show up with other codes?
The low battery voltage can impact other systems, causing multiple codes related to electrical issues or sensor performance.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →