Cummins fault code 4288
Closed Crankcase Ventilation System Pressure: erratic or intermittent signal
What it means
Cummins' description: Closed Crankcase Ventilation System Pressure - Data erratic, intermittent or incorrect.
SPN 520595 is Closed Crankcase Ventilation System Pressure. FMI 2 means the signal is jumping around, dropping in and out, or doesn't make sense compared to other readings.
The crankcase ventilation system relieves pressure from blow-by gases. The ECM monitors crankcase pressure, and some systems have a heated breather to keep it from freezing.
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
A one-time crankcase code in freezing weather that cleared once warm.
Schedule a repair
The code keeps returning or oil is seeping from seals. Service the breather soon.
Stop and get help
Oil blowing out of the dipstick tube, heavy blow-by smoke, or a stop lamp. Shut it down. High crankcase pressure can mean serious internal wear.
Common causes
The sensor reading itself is out of range or the condition is real, so look at the system:
- Plugged crankcase breather or filter
- Frozen breather in cold weather
- Disconnected ventilation hose
- High blow-by from worn rings or a failing turbo
What you can check before calling
- Check that the breather hose is connected and not kinked or frozen
- Look for oil being pushed out of the dipstick tube or seals
- Note heavy smoke from the breather tube
Clearing the code without fixing the cause usually brings it right back, and on emissions systems it can restart derate timers.
Engines and sources
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.
Same SPN, other failure types
Related Crankcase and ventilation codes
- 3734 SPN 862 FMI 4
Crankcase Breather Filter Heater Circuit: circuit voltage low / shorted low - 3733 SPN 862 FMI 3
Crankcase Breather Filter Heater Circuit: circuit voltage high / shorted high - 3377 SPN 5396 FMI 31
Engine Crankcase Ventilation Hose Disconnected: condition exists - 2699 SPN 520320 FMI 7
Crankcase Depression Valve: not responding / out of adjustment - 6336 SPN 862 FMI 3
Crankcase Breather Filter Heater Circuit: circuit voltage high / shorted high - 6337 SPN 862 FMI 4
Crankcase Breather Filter Heater Circuit: circuit voltage low / shorted low
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 4288 mean?
Cummins fault code 4288 is J1939 SPN 520595 FMI 2: Closed Crankcase Ventilation System Pressure - Data erratic, intermittent or incorrect. In plain terms: closed crankcase ventilation system pressure: erratic or intermittent signal.
Can I keep driving with Cummins code 4288?
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 4288?
SPN 520595 identifies the part or system (Closed Crankcase Ventilation System Pressure). FMI 2 describes the type of failure: erratic or intermittent signal.
What usually causes Cummins code 4288?
The most common causes are: plugged crankcase breather or filter; frozen breather in cold weather; disconnected ventilation hose.
Diesel down in the Midlands?
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