OBD-II Code · Body
B1318
Battery Voltage Low
medium severitySafe to drive$50-$500
BCM detects low system voltage at module input.
Common symptoms
- Body warning lights flicker
- Power-window/lock slow
- Hard start
Likely causes
- Failing battery
- Loose battery cable
- Failing alternator
Where to start
- Try the cheapest cause first. Start by checking: failing battery.
- Cost & scope. $50-$500
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
Related codes
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