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15–20 kW standby control board
2
Low oil pressure
Engine · Shutdown
Service code 2. The display scrolls Low Oil Pressure and the remote LED flashes twice. The switch is normally closed and held open by oil pressure. The manual says the contacts close below the 8–10 psi range, grounding wire 85 so the control panel shuts the engine down. During cranking the panel bypasses the switch for several seconds. After it sees the engine running from alternator voltage, a ground on wire 85 is a shutdown.
Seen on: Briggs & Stratton 15 kW and 20 kW standby generator systems covered by manual 381268GS Rev. A.
Likely causes
- Oil level low enough that pressure falls below about 8–10 psi.
- A leak in the lubrication system.
- The switch or wire 85 circuit closed even though a later test would show pressure is up.
Checks an owner can do
- Fix obvious leaks and add the recommended oil to the FULL mark on the dipstick.
- Reset the code the way the manual describes, return it to AUTO, and stop if the same code comes back.
When to call a pro
The next test in the manual is a short-to-ground measurement on that circuit. That is technician work. Do not bypass wire 85. To reset the service-code system, the manual says to hold OFF until the display stops scrolling the code, hold OFF at least 7 more seconds until the display turns off, leave it off at least 30 seconds, correct the cause, then hold AUTO and reinstall the 15 amp fuse if you removed it.
Source
Wording follows that document. Firmware can change a threshold. If this page and the manual shipped with your unit disagree, follow the manual.
What fixed mine
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Related Briggs & Stratton codes
https://generatorcodes.com/brand/briggs-stratton/2