Low Engine Oil Pressure Shutdown Detected
The PERKINS-100-1 (Kohler RDC2) diesel fault code means: Low Engine Oil Pressure Shutdown Detected. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- moderate
- Estimated cost
- $30-$80 DIY for oil top-up, filter service, or sensor swap. Professional diagnosis and sensor replacement typically $150-$350 including labor. Oil pump replacement runs $500-$1,200 at a workshop. Internal bearing work is $2,000 or more and requires engine removal.
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Common Symptoms
- Genset shuts down mid-run and displays fault code 100-1 on the controller panel
- Red shutdown alarm light is illuminated on the controller
- Engine stops abruptly during load or shortly after starting
- Controller shows STOP or FAULT status and will not return to AUTO or RUN without a manual reset
- Oil pressure gauge on the panel reads zero or below the minimum threshold
- Generator fails to restart after the shutdown until the fault is cleared
- Audible alarm sounds continuously after the shutdown event
Probable Causes (Ranked by Likelihood)
- Low engine oil level due to consumption, leakage, or missed service interval Very Likely
- Faulty or drifted oil pressure sensor sending an incorrect low-pressure signal to the controller Very Likely
- Oil pressure sensor wiring fault, corroded connector, or broken wire between sensor and controller Likely
- Clogged or bypassed oil filter restricting flow to the pressure sensing port Likely
- Oil pump wear or failure causing genuinely low pressure throughout the lubrication circuit Possible
- Wrong viscosity oil used during last service, causing inadequate pressure at operating temperature Possible
- Internal engine bearing wear causing excessive oil bleed-down and low rail pressure Less Likely
Step-by-Step Diagnostic Procedure
Step 1. Do NOT attempt to restart the engine immediately after a 100-1 shutdown. Running a diesel with genuinely low oil pressure can destroy bearings within seconds. Confirm the engine is cool before proceeding.
Step 2. Check the engine oil level using the dipstick. The oil should read between the MIN and MAX marks. If it is at or below MIN, add the correct grade oil (check the Perkins engine data plate or your service manual, typically 15W-40 for most 400, 1100, and 1300 series). Recheck and attempt a test start only after the level is correct.
Step 3. Inspect the engine and base frame for oil puddles, wet hoses, or seeping gaskets. A leak that drops oil level between service visits will cause repeated 100-1 faults. Note the location of any wetness for a technician.
Step 4. Locate the oil pressure sensor. On most Perkins 1100 and 1300 series engines it is threaded into the block near the oil filter housing. Inspect the wiring connector for corrosion, moisture, or loose pins. Unplug and reseat the connector firmly. Clear the fault on the controller and run the engine for two minutes to see if the fault returns.
Step 5. With the engine OFF and cool, use a multimeter set to resistance (Ohms). Disconnect the sensor connector and measure resistance across the sensor terminals. A typical Perkins oil pressure sensor reads roughly 10 Ohms at zero pressure and rises to 180 Ohms at full pressure. A reading of OL (open) or 0 Ohms with the engine off suggests a failed sensor. Sensor replacement is a moderate DIY task costing $30 to $80 for the part.
Step 6. If you have access to a mechanical oil pressure test gauge (screw-in type, available at auto parts stores for $20 to $40), remove the sensor and thread in the gauge. Crank the engine briefly. A healthy Perkins diesel should show 20 to 45 PSI at idle and 40 to 60 PSI at rated speed. If mechanical pressure is confirmed normal but the fault code still fires, the sensor or its wiring is the culprit. If mechanical pressure is genuinely low, stop immediately and call a certified diesel technician.
Step 7. Check the oil filter. A filter that has not been changed at the correct interval (typically every 250 to 500 hours depending on the package) can bypass oil at reduced pressure. If the filter is overdue, change it along with the oil before running again.
Step 8. If oil level is correct, no leaks are visible, the sensor and wiring test normal, and a mechanical gauge still shows low pressure, the fault is internal to the engine. Do not run the genset. This scenario requires a Perkins-authorised workshop with Perkins EST (Electronic Service Tool) to perform a full oil circuit and bearing clearance evaluation.
Common Fixes by Vehicle
What techs usually find when diagnosing PERKINS-100-1 on specific platforms — tap a platform for the fix and the exact part:
Perkins 1103D / 1104D / 1106D (FG Wilson packages) Moderate DIY
Perkins SPN 100 FMI 1 (Low Engine Oil Pressure) on industrial gensets is generally a real low-pressure event rather than sensor failure. Confirm with a mechanical gauge in the test port -- spec is typically 30-60 psi at rated speed. If actual pressure is low and oil level is correct, the oil pump pickup screen is often clogged with sludge from extended idle hours. A pickup tube cleaning is several hours of labor; many shops opt to replace the pickup assembly rather than clean it.
Labor: 1-3 hours diagnosisFrequently Asked Questions
What does Perkins code 100-1 mean?
Code 100-1 means the controller measured engine oil pressure below the safe minimum while the engine was running and triggered an immediate shutdown to protect the engine from damage. The 100 refers to the engine oil pressure parameter and the 1 indicates a low fault condition.
Can my generator still run with this code?
No. The genset will not restart until the fault is cleared and the root cause is fixed. This is an intentional protective shutdown. Running a diesel with low oil pressure even for a few minutes can cause permanent bearing and crankshaft damage costing thousands of dollars to repair.
How much does it cost to fix?
If the fix is as simple as topping up oil or replacing the oil pressure sensor, you are looking at $30 to $100 doing it yourself or $150 to $350 with a technician. If the oil pump has failed, expect $500 to $1,200 at a shop. If internal bearings are worn, repair costs start around $2,000 and can exceed the value of a smaller genset.
Will the generator start the next time the power goes out?
No, not until the fault code is cleared from the controller and the underlying problem is fixed. With an active 100-1 fault, the genset will refuse to start in AUTO mode during a real power outage. Resolving this fault before the next outage is urgent, especially if the genset is your primary backup power source.