Volvo All Engines (2010 Emissions) Fault Code: SPN 171 FMI 12 PID: 171 Ambient Air Temperature

Category All Engines (2010 Emissions) Tags 12, 171, 2010, Air, All, Ambient, CodeSPN, Emissions, Engines, Fault, FMI, PID171, Temperature, Volvo

The ambient air temperature signal is sent to the instrument cluster module. The instrument cluster module then transmits the ambient air temperature data to the Engine Control Module (ECM) via the J1939 data lines.

Conditions for diagnostic trouble code (DTC):
1) Communications error

Probable cause
1) Instrument cluster
2) Ambient air temperature sensor

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Volvo All Engines (2010 Emissions) Fault Code: SPN 171 FMI 12 PID: 171 Ambient Air Temperature

CAT ET 2026 Diagnostic Software

DETROIT DIESEL DIAGNOSTIC LINK 8.23 SP2 2026

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PACCAR PX-6 CM2150 (2007-09) Fault Code: 295 PID: 108 SPN: 108 FMI: 2 Barometric Pressure – Data Erratic, Intermittent, or Incorrect. The ambient air pressure sensor is reading an erratic value at initial key-on.

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Volvo All Engines (2010 Emissions) Fault Code: SPN 171 FMI 12 PID: 171 Ambient Air Temperature

CAT ET 2026 Diagnostic Software

DETROIT DIESEL DIAGNOSTIC LINK 8.23 SP2 2026

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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 597 FMI 19 (CPC) J1939 Service Brake Switch Signal from Source #1, #2 or #3 Erratic

PACCAR PX-6 CM2150 (2007-09) Fault Code: 295 PID: 108 SPN: 108 FMI: 2 Barometric Pressure – Data Erratic, Intermittent, or Incorrect. The ambient air pressure sensor is reading an erratic value at initial key-on.

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Detroit DD15 EPA10 (2010-13) Fault Code: SPN 2791 FMI 7 (MCM) Exhaust Gas Recirculation Actuator, Failsafe Mode, Motor ON

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Detroit DD13 EPA10 (2010-13) Fault Code: SPN 647 FMI 5 (MCM) Fan Open Circuit

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