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SPN 108 — Barometric pressure

Do not driveTo the nearest safe stop

J1939 code SPN 108. Below — how the fault is worded at the factory by DAF, Dongfeng, Isuzu, KAMAZ, MAZ, Renault Trucks, SITRAK, YaMZ and ZF AS-Tronic, and what the second half of the code (FMI) means in the standard.

DAFDongfengIsuzuKAMAZMAZRenault TrucksSITRAKYaMZZF AS-Tronic

DAF

FMI 2Air pressure F609 implausible (extended period)
FMI 3Air pressure F609 voltage too high at ECU pin A20 (extended period)
FMI 4Air pressure F609 voltage too low at ECU pin A20 (extended period)

Dongfeng

FMI 2Incorrect atmospheric pressure signal
FMI 3Short circuit to power supply of the atmospheric pressure sensor. Scan tool code: P2229.
FMI 4Short circuit to ground or open circuit of the atmospheric pressure sensor. Scan tool code: P2228.

Isuzu

FMI 3Barometric pressure sensor fault (low voltage fault) (P0107)
FMI 4Barometric pressure sensor fault (high voltage fault) (P0108)

KAMAZ

FMI 0Atmospheric pressure sensor: physical range limit
FMI 1Atmospheric pressure sensor: physical range limit
FMI 2Atmospheric pressure sensor
FMI 3Atmospheric pressure sensor
FMI 4Atmospheric pressure sensor
FMI 12Atmospheric pressure sensor

MAZ

FMI 2Atmospheric pressure sensor circuit fault - Reading inconsistent with the boost pressure reading. Blink code: 2-3-2. Power will be reduced. Repair: Check the sensor and its wiring.
FMI 3Atmospheric pressure sensor circuit fault - Voltage above allowed. Blink code: 2-3-2. Power will be reduced. Repair: Check the sensor and its wiring.
FMI 4Atmospheric pressure sensor circuit fault - Voltage below allowed. Blink code: 2-3-2. Power will be reduced. Repair: Check the sensor and its wiring.
FMI 12Atmospheric pressure sensor circuit fault - CAN bus signal implausible. Blink code: 2-3-2. Power will be reduced. Repair: Check the sensor and its wiring.

Renault Trucks

FMI 0Gear selector lever error. Repair: Check the joystick. Check the CAN communication (X1A/8, X1A/12, X1A/13, X1A/14). Switch the ignition off, switch it on again and repeat the test. If the fault persists, replace the control unit.

SITRAK

FMI 0High atmospheric (barometric) pressure
FMI 1Low atmospheric (barometric) pressure
FMI 3Ambient pressure sensor voltage above the upper limit. Scan tool code: P2229.
FMI 4Ambient pressure sensor voltage below the lower limit. Scan tool code: P2228.
FMI 12Ambient pressure sensor failed its self-diagnosis. Scan tool code: P2226. Effect: Injection correction by air temperature is wrong.
FMI 19Ambient pressure signal error on the CAN bus. Effect: Loss of communication with the modules, some functions are disabled.
FMI 22Ambient pressure above the upper limit. Scan tool code: P2226.
FMI 23Ambient pressure below the lower limit. Scan tool code: P2226.
FMI 24Ambient pressure sensor voltage above the upper limit. Scan tool code: P8745.
FMI 25Ambient pressure sensor voltage below the lower limit. Scan tool code: P8744.

YaMZ

FMI 2Atmospheric pressure sensor circuit fault (Reading inconsistent with boost pressure reading). Blink code: 2-3-2. Power will be reduced. Repair: Check the sensor and its wiring.
FMI 3Atmospheric pressure sensor circuit fault (Voltage above allowable limit). Blink code: 2-3-2. Power will be reduced. Repair: Check the sensor and its wiring.
FMI 4Atmospheric pressure sensor circuit fault (Voltage below allowable limit). Blink code: 2-3-2. Power will be reduced. Repair: Check the sensor and its wiring.
FMI 12Atmospheric pressure sensor circuit fault (CAN bus signal implausible). Blink code: 2-3-2. Power will be reduced. Repair: Check the 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 8Mechanical fault in the rotary switch.

What FMI means in J1939

SPN 108 FMI 0108/0 · 108.0data above normal range (most severe level)
SPN 108 FMI 1108/1 · 108.1data below normal range (most severe level)
SPN 108 FMI 2108/2 · 108.2data erratic or intermittent
SPN 108 FMI 3108/3 · 108.3voltage above normal or shorted high
SPN 108 FMI 4108/4 · 108.4voltage below normal or shorted to ground
SPN 108 FMI 8108/8 · 108.8abnormal frequency or pulse width
SPN 108 FMI 12108/12 · 108.12faulty device or component
SPN 108 FMI 19108/19 · 108.19error 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: To the nearest safe stop

The code is flagged critical: the manufacturer considers it unsafe to keep driving without checking.

This code alone cannot say what will fail next, so stop at the first safe opportunity and look at it on the spot.

That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.

Nearby: other

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