Do not driveMinutes
J1939 code SPN 23. Below — how the fault is worded at the factory by Ford Trucks, and what the second half of the code (FMI) means in the standard.
Ford Trucks/Ecotorq writes fault numbers in its own format: the code in the table below is a Ford code (hexadecimal, zero-padded), not a J1939 SPN. It matches the standard only where the signal itself is standard, and usually matches the title of this page by digit alone.
| FMI 0 | Urea Injector Electrical Circuit – High Temperature. FODP code (scan tool): P202E-4B. |
| FMI 2 | Transmission Control Module CAN Communication Error. FODP code (scan tool): U0302-01. |
| FMI 3 | Transmission Control Module CAN Communication Error. FODP code (scan tool): U0302-02. |
| FMI 5 | Transmission Control Module CAN Communication Error. FODP code (scan tool): U0302-03. |
| FMI 6 | Transmission Control Module CAN Communication Error. FODP code (scan tool): U0302-04. |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
The oil film in the bearings is already breaking down. Every minute under load is metal on metal on the crank journals.
Next comes spun bearings and a full engine rebuild. Shut it down now and coast to the shoulder without revving.
The pressure itself is most likely fine: this is an electrical fault — an open or a short in the sensor circuit, not lost oil. You can drive, but the dash will no longer warn you about a real pressure drop. Until the circuit is repaired, check the level with the dipstick at every stop.
Shut the engine down. Check the oil level with the dipstick and look underneath for leaks. Don’t restart until pressure is back.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.