B1317 Code: Battery Voltage High
🟠 Moderate severity · drivable
Drivable, but high voltage can damage electronics, so diagnose the charging system soon.
What B1317 means
The body control module is seeing battery voltage that's too high, usually above about 16 volts. This typically points to the alternator overcharging.
Symptoms
- Check engine light or battery light on
- Dim or flickering lights
- Possible electrical component damage
- Battery may overheat
Common causes
- most common: Alternator overcharging
- common: Faulty voltage regulator
- less common: Damaged battery or charging wiring
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Test the alternator output and replace it if overcharging | Mechanic | $200–500 |
| Repair damaged charging wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a B1317 code?
Yes, but high voltage can damage electronics over time. Get the charging system checked soon.
What is the most common cause of B1317?
An alternator that's overcharging, often due to a failed voltage regulator.
How much does it cost to fix a B1317?
Typically $200–$500 for a new alternator.
Related codes
B1318
B1318 Code: Battery Voltage Low
P0562P0562 Code: System Voltage Low
P0563P0563 Code: System Voltage High
Related guide: The 10 Most Common Check Engine Codes →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.