What is LPC-BUS-HANG?
Sensor bus (LPC) freeze (LPC-BUS-HANG) is a critical-severity fault affecting the motherboard. The sensor bus for temperature monitoring and fan control stopped responding. The usual suspects are dead battery CR2032, short circuit on the motherboard, aborted BIOS update process and age of capacitors. Follow the steps below to fix it.
Common Causes
- Dead battery CR2032
- Short circuit on the motherboard
- Aborted BIOS update process
- Age of capacitors
Step-by-Step Fix Guide
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1
Replace the CMOS battery on the motherboard
Most reports of LPC-BUS-HANG clear up after Replace the CMOS battery on the motherboard, so it's worth trying before anything more involved.
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2
Use the USB BIOS Flashback function (if the board has a button)
For cases that don't clear up right away, the remaining steps target less typical mobo instability problems.
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3
Check the rear I/O panel for a short
If earlier steps didn't help, "Check the rear I/O panel for a short" directly addresses short circuit on the motherboard.
Commands & Diagnostics
systeminfo | findstr /C:"BIOS Version"
Frequently Asked Questions
Dead battery CR2032 accounts for the majority of LPC-BUS-HANG reports; short circuit on the motherboard, aborted BIOS update process and age of capacitors come up less often but are documented.
Try "Replace the CMOS battery on the motherboard" first — it resolves most LPC-BUS-HANG cases on its own. Only work through the rest of the guide above if it comes back.
Treat LPC-BUS-HANG as urgent — it's flagged critical severity, meaning repeated occurrences risk data loss or hardware damage.
Usually. LPC-BUS-HANG is fixable with the steps above; a full Windows reinstall is rarely necessary unless everything else has failed.
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