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SPN 175 — Oil temperature

Do not driveMinutes

J1939 code SPN 175. Below — how the fault is worded at the factory by International, KAMAZ, MAZ, Renault Trucks, SITRAK, YaMZ and ZF AS-Tronic, and what the second half of the code (FMI) means in the standard.

InternationalKAMAZMAZRenault TrucksSITRAKYaMZZF AS-Tronic

International

FMI 0Engine Oil Temperature 1 — Engine Oil Temp Sensor reading above normal range
FMI 1Engine Oil Temperature 1 — Engine Oil Temp Sensor reading below normal range

KAMAZ

FMI 2Oil temperature sensor
FMI 3Oil temperature sensor. K-line code on KamAZ-5490: MR2 11015.
FMI 4Oil temperature sensor. K-line code on KamAZ-5490: MR2 11016.
FMI 12Oil temperature sensor
FMI 17⚠ Oil temperature too high

MAZ

FMI 2Oil temperature sensor circuit fault - CAN bus signal implausible. Blink code: 2-4-4. Repair: Check the oil temperature sensor and its wiring.
FMI 3Oil temperature sensor circuit fault - Voltage below allowed. Blink code: 2-4-4. Repair: Check the oil temperature sensor and its wiring.
FMI 4Oil temperature sensor circuit fault - Voltage above allowed. Blink code: 2-4-4. Repair: Check the oil temperature sensor and its wiring.
FMI 12Oil temperature sensor circuit fault - Reading inconsistent with the coolant temperature reading. Blink code: 2-4-4. Repair: Check the oil temperature sensor and its wiring.
FMI 17Oil temperature too high - Implausible signal. Blink code: 2-4-4. Repair: Turn the crankshaft over and make sure there are no unusual noises while the engine runs. Contact a service centre.

Renault Trucks

FMI 3Oil temperature sensor, short to positive. Repair: Check the sensor and the wiring (J 1/5, J 1/26).
FMI 4Oil temperature sensor — short to ground. Repair: Check the sensor and the wiring (J 1/5, J 1/26). Check the voltage on the control unit pins (X1A/1, X1A/4, X1A/5, X1A/16, X1A/17). Switch the ignition off, switch it on again and repeat the test. If the fault persists, replace the control unit.
FMI 5Oil temperature sensor, open circuit. Repair: Check the sensor and the wiring (J 1/5, J 1/26).

SITRAK

FMI 2Implausible oil temperature sensor signal. Scan tool code: P0196. Effect: Torque may be limited.
FMI 3Oil temperature sensor voltage above the upper limit. Scan tool code: P0198. Effect: Fan and warm-up control may misbehave.
FMI 4Oil temperature sensor voltage below the lower limit. Scan tool code: P0197. Effect: Fan and warm-up control may misbehave.
FMI 8Oil temperature too high, plausibility error. Scan tool code: P0196. Effect: Torque may be limited.
FMI 15Oil temperature too high, plausibility error. Scan tool code: P0196. Effect: Fan and warm-up control may misbehave.
FMI 16Oil temperature above the upper limit. Scan tool code: P0195. Effect: Torque may be limited.
FMI 18Oil temperature below the lower limit. Scan tool code: P0195. Effect: Torque may be limited.
FMI 19Oil temperature signal error on the CAN bus. Effect: Fan and warm-up control may misbehave.
FMI 22Oil sump over-temperature, threshold 1. Scan tool code: P0520.
FMI 23Oil sump over-temperature, threshold 2. Scan tool code: P0520.

YaMZ

FMI 2Oil temperature sensor circuit fault (CAN bus signal implausible). Blink code: 2-4-4. Repair: Check the oil temperature sensor and its wiring.
FMI 3Oil temperature sensor circuit fault (Voltage below allowable limit). Blink code: 2-4-4. Repair: Check the oil temperature sensor and its wiring.
FMI 4Oil temperature sensor circuit fault (Voltage above allowable limit). Blink code: 2-4-4. Repair: Check the oil temperature sensor and its wiring.
FMI 12Oil temperature sensor circuit fault (Reading inconsistent with coolant temperature reading). Blink code: 2-4-4. Repair: Check the oil temperature sensor and its wiring.
FMI 17High oil temperature (Implausible signal). Blink code: 2-4-4. Repair: Turn the crankshaft over and make sure there are no unusual noises while the engine runs. Contact a service centre.

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 4No supply voltage on "ignition" (terminal 15).

What FMI means in J1939

SPN 175 FMI 0175/0 · 175.0data above normal range (most severe level)
SPN 175 FMI 1175/1 · 175.1data below normal range (most severe level)
SPN 175 FMI 2175/2 · 175.2data erratic or intermittent
SPN 175 FMI 3175/3 · 175.3voltage above normal or shorted high
SPN 175 FMI 4175/4 · 175.4voltage below normal or shorted to ground
SPN 175 FMI 5175/5 · 175.5current below normal or open circuit
SPN 175 FMI 8175/8 · 175.8abnormal frequency or pulse width
SPN 175 FMI 12175/12 · 175.12faulty device or component
SPN 175 FMI 15175/15 · 175.15above normal — low severity
SPN 175 FMI 16175/16 · 175.16above normal — moderate severity
SPN 175 FMI 17175/17 · 175.17below normal — low severity
SPN 175 FMI 18175/18 · 175.18below normal — moderate severity
SPN 175 FMI 19175/19 · 175.19error in received network data

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

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