Battery Voltage Low - Load Test Fail
The battery voltage is dropping below acceptable levels under load.
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)
When you turn on your car, the battery gets a good check. If it can't hold voltage above about 9.6 volts while cranking, it throws this code.
What the computer is actually seeing
The vehicle's computer is monitoring the battery voltage during start-up and load conditions. If voltage drops below the threshold of 9.6 volts, it flags this code.
What a healthy reading looks like
Battery voltage should be between 12.4 and 12.7 volts at rest and not drop below 9.6 volts during cranking.
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. Check battery voltage with a multimeter; it should read above 12.4 volts at rest. If it's below, replace the battery.
- 22. Clean and tighten battery terminals; corrosion can cause voltage drops.
- 33. Perform a load test on the battery to see if it holds voltage under load; a drop below 9.6 volts indicates a bad battery.
- 44. Check the alternator output; it should provide between 13.5 to 14.5 volts while running. If not, check wiring and replace alternator if needed.
- 55. Inspect starter motor draw; if it pulls too much power (over 200 amps on cranking), consider replacing it.
Common causes
- Weak or failing battery
- Corroded battery terminals
- Faulty starter motor
- Faulty alternator
- Wiring issues between battery and engine components
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable if the battery is just weak, but expect starting issues. Fix it soon to avoid being stranded.
Will this code come back after clearing?
If the underlying issue isn't resolved, the code can and likely will return.
Why do I see this code along with starting issues?
Because a weak battery or faulty starter affects starting, often triggering this code.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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