Generac · Generator Serious

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

  1. Check the oil level on the dipstick and top up with the Generac-specified oil/viscosity.
  2. If the level is correct, test the oil pressure switch/sender.
  3. Verify the correct oil grade for your climate.
  4. 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.

  • Generac oil pressure switch / sender Common replacement
    Amazon →
  • Generac 5W-30 synthetic engine oil Common replacement
    Amazon →

More Generac generator codes

1100 1100 — Overcrank (Engine Failed to Start) 1501 1501 — RPM Sense Loss 1505 1505 — Overcrank (Variant — Try Again) 1600 1600 — Underspeed 1800 1800 — Overvoltage 1900 1900 — Undervoltage

All Generac codes → All generator codes →

Frequently asked questions

What does the 1300 code mean on a Generac generator?

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.)

What causes the 1300 code on a Generac generator?

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.

Is it safe to keep using a Generac generator with a 1300 error?

Limited use only. This is rated a serious-severity fault.

How do I fix 1300 on a Generac generator?

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.

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.