1300 — Generac 1300 — Low Oil Pressure Shutdown
Alarm 1300 is a Low Oil Pressure shutdown: engine oil pressure dropped below the safe threshold and the controller shut the unit down to protect the engine. (Over-temperature is a separate code, 1400.) (Meaning corrected against official Generac support documentation / Evolution controller e-code list; older Nexus controllers may differ — confirm for your unit.)
- Keep using it?
- Limited use only
- DIY difficulty
- Moderate
- Verified against
- support.generac.com ↗
How to fix it
- Check the oil level on the dipstick and top up with the Generac-specified oil/viscosity.
- If the level is correct, test the oil pressure switch/sender.
- Verify the correct oil grade for your climate.
- If pressure is genuinely low with good oil, have a dealer inspect the engine.
Why it happens
Typical signs: Generator shut down · 1300 in the alarm log · Possibly visibly low oil on the dipstick
- Low engine oil level The most common cause — check and top up first.
- Faulty oil pressure switch/sender A failed switch can report false low pressure.
- Wrong oil viscosity Oil too thin for the temperature.
- Oil pump or engine wear Less common; reduced actual oil pressure.
Parts you may need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
More Generac generator codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: support.generac.com.