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SPN 98 — Engine oil level

Do not driveMinutes

J1939 code SPN 98. Below — how the fault is worded at the factory by Dongfeng, KAMAZ, MAZ, Meritor (ex-WABCO), Renault Trucks, SITRAK, YaMZ and ZF AS-Tronic, and what the second half of the code (FMI) means in the standard.

DongfengKAMAZMAZMeritor (ex-WABCO)Renault TrucksSITRAKYaMZZF AS-Tronic

Dongfeng

FMI 0High oil level. Scan tool code: P252F. Effect: Torque may be limited.
FMI 1Low oil level. Scan tool code: P250F. Effect: Torque may be limited.
FMI 2Incorrect oil level signal
FMI 17Low oil level (minor)

KAMAZ

FMI 0Engine oil level (from PLD/MR2). K-line code on KamAZ-5490: ADM3 10400.
FMI 2Oil level sensor
FMI 3Oil level sensor
FMI 4Oil level sensor
FMI 12Oil level sensor

MAZ

FMI 2Oil level sensor circuit fault - Implausible signal. Blink code: 2-4-7. Repair: Check the oil level sensor and its wiring.
FMI 3Oil level sensor circuit fault - Voltage above allowed. Blink code: 2-4-7. Repair: Check the oil level sensor and its wiring.
FMI 4Oil level sensor circuit fault - Voltage below allowed. Blink code: 2-4-7. Repair: Check the oil level sensor and its wiring.
FMI 12Oil level sensor circuit fault - CAN bus signal implausible. Blink code: 2-4-7. Repair: Check the oil level sensor and its wiring.

Meritor (ex-WABCO)

FMI 2ECU Main Ground or Reference Ground Connection — ECU Main or Reference Ground

Renault Trucks

FMI 2Oil level sensor, electrical fault. Repair: Check the sensor and the wiring (J 1/1, J 1/13).
FMI 3Oil level sensor — open circuit (detected after 15 seconds). Repair: Check the sensor and the wiring (A 17, A 38). Check the sensor and the wiring (J 1/1, J 1/13).
FMI 4Oil level sensor — short to ground or to 5 V. Repair: Check the sensor and the wiring (A 17, A 38). Check the sensor and the wiring (J 1/1, J 1/13).
FMI 8Transmission input speed signal fault. Repair: Switch the ignition off, switch it on again and repeat the test. If the fault persists, replace the control unit.
FMI 12Oil level sensor, implausible signal. Repair: Check the sensor and the wiring (A 17, A 38).

SITRAK

FMI 0Oil level above the upper limit. Scan tool code: P252F. Effect: Torque may be limited.
FMI 1Oil level below the lower limit. Scan tool code: P250F. Effect: Torque may be limited.
FMI 8Implausible oil level sensor signal. Scan tool code: P250B. Effect: Torque may be limited.

YaMZ

FMI 2Oil level sensor circuit fault (Implausible signal). Blink code: 2-4-7. Repair: Check the oil level sensor and its wiring.
FMI 3Oil level sensor circuit fault (Voltage above allowable limit). Blink code: 2-4-7. Repair: Check the oil level sensor and its wiring.
FMI 4Oil level sensor circuit fault (Voltage below allowable limit). Blink code: 2-4-7. Repair: Check the oil level sensor and its wiring.
FMI 12Oil level sensor circuit fault (CAN bus signal implausible). Blink code: 2-4-7. Repair: Check the oil level sensor and its wiring.

ZF AS-Tronic

ZF AS-Tronic uses its own fault numbering: the number in the table below is an internal ZF code, not a J1939 SPN. It matches the title of this page by digit only and means something different.

FMI 8No signal from the ZF "transmission input shaft speed" sensor.

What FMI means in J1939

SPN 98 FMI 098/0 · 98.0data above normal range (most severe level)
SPN 98 FMI 198/1 · 98.1data below normal range (most severe level)
SPN 98 FMI 298/2 · 98.2data erratic or intermittent
SPN 98 FMI 398/3 · 98.3voltage above normal or shorted high
SPN 98 FMI 498/4 · 98.4voltage below normal or shorted to ground
SPN 98 FMI 898/8 · 98.8abnormal frequency or pulse width
SPN 98 FMI 1298/12 · 98.12faulty device or component
SPN 98 FMI 1798/17 · 98.17below normal — low severity

Can I keep driving

Do not drive. Stop as soon as it’s safe to do so — don’t keep going.

What happens if you keep driving

Time you have: Minutes

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.

What to check on the spot

Shut the engine down. Check the oil level with the dipstick and look underneath for leaks. Don’t restart until pressure is back.

Nearby: lubrication

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.