Manufacturer Specific Code for Battery Voltage Performance
Indicates a fault related to battery performance monitoring.
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 computer is detecting that the battery's voltage is not performing within expected limits, which could mean it's weak, not charging properly, or there's a problem with the power management system.
What the computer is actually seeing
The vehicle’s computer continuously checks the battery voltage during operation. If it sees voltage readings consistently below 12.4 volts when the engine is off or below 13.5 volts with the engine running, it will trigger this code.
What a healthy reading looks like
Battery voltage should be between 12.6 to 12.8 volts (engine off) and 13.5 to 14.5 volts (engine running).
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 the battery voltage with a multimeter. Expected: 12.6-12.8V (off), 13.5-14.5V (running). Decision: If outside range, proceed to step 2. If within range, investigate other components.
- 22. Inspect battery terminals for corrosion or looseness. Decision: Clean or tighten as needed. If issues persist, move to step 3.
- 33. Test the alternator output while the engine is running. Expected output: 13.5-14.5V. Decision: If voltage is low, alternator may be faulty. If normal, proceed to step 4.
- 44. Check all wiring and connections from the battery to the electrical system for wear or damage. Decision: Repair any noted issues and retest the system.
Common causes
- Weak or failing battery
- Faulty alternator
- Corroded or loose battery terminals
- Wiring issues leading to voltage drop
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not an immediate safety risk, but you should fix it soon to avoid battery or electrical system failure.
Will this code come back after clearing it?
If the underlying issue isn't resolved, then yes, it will likely return.
Why does this code sometimes pair with others like P0562?
P0562 indicates low voltage detected by the power supply module, showing a deeper issue in the charging system.
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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