3238 Fmi 2 (2024)

FAQs

What is the code SPN 3238 FMI 2? ›

SPN 3238 fmi 2. This falls code leans towards commonly a faulty SCR outlet NOx sensor. Thoroughly inspect the wiring and if the wiring checks out OK, replace the sensor.

So here is the list of possible FMI values: 0 = Data Valid but Above Normal Operational Range, Most Severe Level. 1 = Data Valid but Below Normal Operational Range, Most Severe Level. 2 = Data Erratic, Intermittent or Incorrect (rationality) 3 = Voltage Above Normal, or Shorted to High Source.

SPN 51/FMI 2 - ALL YEARS

This diagnostic is typically Intake Throttle Position Deviation Error. This code sets when the intake throttle valve position has a 30% deviation from the position commanded by the Motor Control Module (MCM) when the engine coolant temperature is above 60°C (140°F).

The FMI may indicate that a problem with an electronic circuit or an electronic component has been detected. The FMI may also indicate that an abnormal operating condition has been detected. The codes are displayed in the form “SPN – FMI”.

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.

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.

Data Erratic, Intermittent Or Incorrect: Erratic or intermittent data includes all measurements that change at a rate that is not considered possible in the real world condition and must be caused by improper operation of the measuring device or its connection to the module.

The Functional Mock-up Interface (or FMI) defines a standardized interface to be used in computer simulations to develop complex cyber-physical systems. Functional Mock-up Interface.

It's important to repair or replace a faulty NOx sensor quickly to protect your engine and aftertreatment system. You can drive for a short time with a faulty one, with the engine running rich and over-using DEF, but the ECU will eventually send your truck into limp mode and engine derate.

Can I drive with a bad/faulty NOx sensor? No. A faulty NOx sensor may prevent the engine from maintaining its emission standards at an acceptable level, or in more extreme circ*mstances prevent the engine from starting at all.

Can you reset a NOx sensor? ›

Of course, you can reset the NOx sensor by yourself. Use a special obd2 scanner, follow the steps according to the prompts, and you can realize NOx sensor reset.

The throttle valve is a mechanical device whose function is to regulate and maintain the downstream pressure so that the inlet conditions for the expansion are constant. It does this by introducing a flow restriction, inducing a significant localized pressure drop in the fluid.

SPN stands for Suspect Parameter Number. It's a diagnostic trouble code that provides detailed information about specific faults detected by the vehicle's ECU, making it easier to identify and address issues within the vehicle's electronic systems.

SPN stands for Suspect Parameter Number. It's a diagnostic trouble code that provides detailed information about specific faults detected by the vehicle's ECU, making it easier to identify and address issues within the vehicle's electronic systems.

SPN 1592/FMI 9

Description This Fault Code Indicates a Missing Message from the Antilock Brake System (ABS) Module. Check as follows: 1. Check for multiple codes. Are there any SPN 168 (battery voltage) fault codes present?

SPN: 251

This fault indicates that the real-time clock in the ECM lost power. Possible causes for this fault are weak or damaged real-time clock battery, damaged wiring or connectors between the battery and ECM, Or the vehicle battery power to the ECM is lost.