Cummins fault code 143
Engine Oil Rifle Pressure: reading below normal (moderately severe)
What it means
Cummins' description: Engine Oil Rifle Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level.
SPN 100 is Engine Oil Pressure. FMI 18 means the value is clearly below normal operating range. It's the middle 'low' level.
The ECM monitors oil pressure, oil temperature and, on some engines, oil level. Low oil pressure is one of the fastest ways to destroy an engine, so Cummins treats it very seriously.
What the lamp means
An amber (yellow) warning lamp means the engine can usually keep running, but the fault should be repaired soon, ideally the same day.
Green, yellow, red: three ways this can look
The same code can be a quick fix or a reason to shut down. Match your situation to the closest example.
Keep an eye on it
An oil change reminder, or a sensor code where the gauge reads normal and the level is full.
Schedule a repair
Oil level low or a sensor code that keeps coming back. Top off and get it checked soon, and don't ignore oil consumption.
Stop and get help
Low oil pressure warning, gauge near zero, knocking, or a stop lamp. Shut the engine off immediately. Every second of low oil pressure damages bearings.
Common causes
The sensor reading itself is out of range or the condition is real, so look at the system:
- Low oil level
- Wrong oil viscosity or diluted oil (fuel or coolant in the oil)
- Worn oil pump or bearings
- Clogged oil filter or pickup
- Real high oil temperature from heavy load or a cooling problem
What you can check before calling
- Check the oil level with the engine off and level
- Look at the oil for milky color (coolant) or a fuel smell
- Note whether the oil gauge drops at hot idle
Clearing the code without fixing the cause usually brings it right back, and on emissions systems it can restart derate timers.
Engines and sources
Listed by Cummins for: QSB 6.7, QSL 9, QSX 15, QSB 4.5, QSF 3.8, QSG 12. Cummins uses the same fault code numbers across its electronic engines, including on-highway models like the ISB/B6.7, ISL/L9 and ISX/X15, though not every code applies to every engine or software level. Source: Cummins Tier 4 Fault Codes. Always confirm with Cummins service information (QuickServe) for your engine serial number.
- Older Cummins engines may report this code as SPN 100 FMI 1 (Engine Oil Pressure Low – Warning).
Same SPN, other failure types
- 135 SPN 100 FMI 3
Engine Oil Rifle Pressure 1 Sensor Circuit: circuit voltage high / shorted high - 141 SPN 100 FMI 4
Engine Oil Rifle Pressure 1 Sensor Circuit: circuit voltage low / shorted low - 415 SPN 100 FMI 1
Engine Oil Rifle Pressure: reading below normal (most severe) - 435 SPN 100 FMI 2
Engine Oil Rifle Pressure: erratic or intermittent signal
Related Engine oil codes
- 137 SPN 1208 FMI 4
Pre Filter Oil Pressure Sensor Circuit Failed Low: circuit voltage low / shorted low - 136 SPN 1208 FMI 3
Pre Filter Oil Pressure Sensor Circuit Failed High: circuit voltage high / shorted high - 212 SPN 175 FMI 3
Engine Oil Temperature Sensor 1 Circuit: circuit voltage high / shorted high - 213 SPN 175 FMI 4
Engine Oil Temperature Sensor 1 Circuit: circuit voltage low / shorted low - 214 SPN 175 FMI 0
Engine Oil Temperature: reading above normal (most severe) - 219 SPN 1380 FMI 1
Low Oil Level in the Centinel makeup oil tank: reading below normal (most severe)
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does Cummins fault code 143 mean?
Cummins fault code 143 is J1939 SPN 100 FMI 18: Engine Oil Rifle Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level. In plain terms: engine oil rifle pressure: reading below normal (moderately severe).
Can I keep driving with Cummins code 143?
Usually for a short time, if the engine runs normally and no other warnings are on. Get it diagnosed soon, because many amber codes lead to a derate if ignored. Look at the green, yellow and red examples on this page to judge your situation.
What is the SPN and FMI for Cummins code 143?
SPN 100 identifies the part or system (Engine Oil Pressure). FMI 18 describes the type of failure: reading below normal (moderately severe).
What usually causes Cummins code 143?
The most common causes are: low oil level; wrong oil viscosity or diluted oil (fuel or coolant in the oil); worn oil pump or bearings.
Diesel down in the Midlands?
We work on Cummins-powered pickups, vans and medium-duty trucks across Lexington, Columbia and the Midlands, on site at your yard or roadside.