OBD-II Code
B1313
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$0–$650
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$0 (clear post-jumpstart) to $650 (BCM replacement and reprogram).
B1313 is a body-side overvoltage code — the BCM (Body Control Module) is reading the battery/ignition feed above its acceptable upper window, typically anything north of 16.0V sustained on a system that should sit at 12.4-12.8V engine-off and 13.5-14.5V with the alternator charging.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureB1313 is a body-side overvoltage code — the BCM (Body Control Module) is reading the battery/ignition feed above its acceptable upper window, typical…
B1313 is a body-side overvoltage code — the BCM (Body Control Module) is reading the battery/ignition feed above its acceptable upper window, typically anything north of 16.0V sustained on a system that should sit at 12.4-12.8V engine-off and 13.5-14.5V with the alternator charging.
The cheapest-first ladder
- Throw a multimeter on the battery posts engine-off and engine-running — if you see 15.5V+ at the battery with the alternator working, the voltage regulator inside the alternator is failing and over-driving the system (cheapest real fix).
- Check the BCM power-feed connector and the main ground strap from the engine to the body — a corroded or loose ground floats the BCM's reference and makes a perfectly normal 14.2V read as an overvoltage event.
- Scan the BCM's live-data voltage PID and compare it against an actual multimeter reading on the same circuit — if the BCM reports 16.5V while your meter shows 14.1V, the BCM's internal voltage-sense circuit is the failure, not the alternator. Expensive-misdiagnosis caveat: do NOT throw a $250-$600 BCM at this code without first confirming the actual feed voltage with a meter — half the B1313 tickets that come into independent shops are bad alternator regulators ($120-$280 installed) where the previous shop replaced the BCM and the new module instantly set the same code on the next drive cycle.
Vehicle-specific patterns2011-2016 Ford F-150/Explorer/Edge with Sync2 (and early Sync3) frequently throws B1313 during or shortly after a module reflash event — the alternat…
- 2011-2016Ford F-150/Explorer/Edge with Sync2 (and early Sync3) frequently throws B1313 during or shortly after a module reflash event — the alternator regulator on these trucks doesn't damp transient voltage spikes well, and a reflash with the engine running pushes the BCM's voltage-sense over threshold for a few seconds and sets the code.
- 2010-2015GM trucks/SUVs (Silverado, Sierra, Tahoe, Suburban) running the CS130D-style alternator commonly throw B1313 when the internal regulator goes intermittent and spikes to 16-17V under low-load cruise. Any vehicle that's been jump-started or hooked to a 50A+ charger in the past 48 hours can latch B1313 from the transient — clear it, drive a few cycles, and if it doesn't return, it was the jumpstart event.
- 2007-2012Nissan Altima/Maxima with the IPDM and ECM-controlled alternator throws B1313 when the duty-cycle command from the ECM glitches and commands full-field output regardless of battery state.
Estimated repair$0 (clear post-jumpstart) to $650 (BCM replacement and reprogram).
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