Spn 102 Fmi 16 Dd15 (2025)

FAQs

What is the code SPN 102 on a Freightliner? ›

The spn 102 fault codes have to do with the intake manifold pressure sensor (boost pressure sensor.)

This fault code indicates that the vehicle's speed sensor is not working properly. Article. The SPN 4 FMI 16 code is a diagnostic trouble code (DTC) for a Fault Mode Indicator (FMI) 16. This code is associated with a loss of communication with the device that controls the engine's exhaust gas recirculation (EGR) system ...

SPN#102, FMI#2 ― Intake Manifold Pressure Sensor Circuit Data Incorrect.

Possible causes of this fault code include:Boost leaks in the charge-air cooler plumbingA malfunction of the variable geometry turbocharger (VGT)A malfunction of the exhaust gas recirculation (EGR) valveA malfunctioning in-range EGR differential pressure sensorA malfunctioning in-range boost pressure sensorA ...

It's likely the piston rings are being worn down and allowing excess fuel/air mixture into the intake, reducing efficiency. In a situation where the manifold pressure starts to slip lower than normal… you have something obstructing your intake valve.

A Suspect Parameter Number (SPN) is a specific code used in the automotive industry to identify and diagnose faults codes in electronic control units (ECUs) within vehicles. These codes are integral to the CAN Bus system, facilitating precise monitoring and troubleshooting of vehicular systems.

System Voltage Too Low

The engine runs poorly or stalls due to low system voltage.

FMI stands for failure mode identifier—this part of the fault code tells you what type of problem your truck has. For example, in the fault code SPN 3226 FMI 13, the SPN number 3226 tells you the problem is with the SCR outlet NOx sensor and FMI 13 tells you that the signal from the part is unavailable.

Failure Mode Indication (FMI), as part of the J1939 standard used in heavy-duty vehicles, functions by closely monitoring system components. When a fault occurs, FMI generates a precise code that identifies the specific nature of the issue, much like an advanced version of a 'check engine' light.

The intake manifold pressure sensor measures the intake manifold vacuum that exists in the intake manifold after the throttle. The measured values of the intake manifold pressure sensor and the intake air temperature sensor are required to calculate the intake air mass.

How does a boost sensor work? ›

The boost pressure sensor with temperature sensor is installed in the air inlet pipe ("inlet manifold") between the turbocharger and engine, and measures the absolute pressure. Additional consideration for the intake air temperature allows more accurate measurement of the intake air mass.

SPN 102/FMI 18 - GHG14. Description. Intake Manifold Pressure Lower than Expected Under a Load.

This diagnostic is typically Diesel Particulate Filter (DPF) Pressure Out of Range Very High. This fault code sets when the DPF outlet pressure is greater than 35 kPa (5 psi) for more than 10 seconds.

SPN 4752/FMI 16

Description This fault Code Sets When the Motor Control Module (MCM) Detects That the EGR Temperature After the EGR Cooler is Not Within a Threshold. Typical Enabling Conditions Engine Coolant Temperature Greater than 65°C (149°F).

SPN is short for suspect parameter number. It identifies which electrical circuit, part or component of your truck isn't working properly. FMI stands for failure mode identifier—this part of the fault code tells you what type of problem your truck has.

SPN# 102, FMI# 4 ― Intake Manifold Pressure Low Signal Voltage -- Continued. FMI#4.