Cummins ISB4.5 CM2150 Fault Code: 3151 PID: SPN: 4794 FMI: 31 Aftertreatment SCR Catalyst System Missing - Condition Exists. - EcuForce Truck (2024)

FAQs

What is fault code 3151 Cummins? ›

5655 is a derate fault and 3151is a fault that states that the SCR is missing. This is usually caused by a faulty outlet nox sensor in my experience.

6.7L Cummins, 2018 KW, Code 3134. "DPF outlet pressure sensor circuit voltage below normal or shorted to low.

For example, you can get an FMI 31 code for having an empty DEF tank, or it may even be a code that informs you that the truck is in derate.

Your sensor supply voltage fault code indicates that the supply voltage from the ECM to the sensors is not within the 5 V range that it should be. Start by testing all of your batteries with a digital battery tester for possible bad cells and load testing them.

Using a code reader tool, connect to the ECM and find the “fault codes” tab. The displayed codes can generally be clicked on one by one. Another option is to select “erase all faults” and then follow the onscreen instructions. At the end of the procedure, the ignition key should be turned off.

A diesel particulate filter (DPF) differential pressure sensor measures exhaust backpressure and signals when the power-train control module (PCM) should begin a regeneration process to clear the filter of diesel particulate matter (DPM), or soot.

SPN stands for Suspected Parameter Number which tells you the circuit where the fault occurred. For example, if you had a SPN 1791 code, it would point to a fault detected in the EGR Valve Control Circuit. FMI stands for Failure Mode Indicator which tells you the reason the fault code was set.

P040D Code: Exhaust Gas Recirculation Temperature Sensor “A” Circuit High.

SPN 4 FMI 4 is a code used to diagnose a problem with the fuel injectors on a diesel engine. This code is often associated with a loss of power, and the engine may run rough or stall. If you are experiencing these symptoms, it is important to have your vehicle checked by a qualified mechanic as soon as possible.

The SPN 11 FMI 5 code is a diagnostic trouble code for a fault with the engine speed sensor. This code is set when the engine speed sensor signal is missing or erratic. The engine speed sensor is used by the engine control module to synchronize the engine's firing order.

What does spn mean on an engine? ›

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.

SPN 521049/FMI 31

Description This Code Sets When There is a Code Present for the Diesel Exhaust Fluid (DEF) Tank Level, DEF Dosing Unit, DEF Pump, NOx Sensors, Blocked DEF Line, DEF Quality, NOx Efficiency, Selective Catalyst Reduction (SCR) Harness and/or SCR Sensor.

Cummins Generator Fault Code 143 – Low Oil Pressure Warning

Shut the generator down and follow all procedures for disabling the generator. Check the oil level. If it is low, add enough oil to bring it up to full, but do not overfill. Use the recommended viscosity oil for the current weather conditions.

Low voltage during cranking can cause the ECM power supply to drop below specifications and log Fault Code 434 . Corrupted voltage (short interruptions or spikes that can only be seen with a with a oscilloscope) on keyswitch line can cause this fault.

Fault Code 74 sets due to the engine failing to respond to torque or speed requests sent by the TECU. Possible causes for this fault are due to OEM issues and cannot be caused by the transmission wiring or TECU.

A failure to maintain the correct fuel tank pressure results in trouble code P0456. This means that a leak is allowing vapors to escape, either directly from the fuel tank or from related hoses and parts.

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).

Malfunction Indicator Lamp (MIL) Lights up to warn the driver to schedule service soon. May light up in addition to other lamps. Red Stop Engine Lamp Indicates that engine must be stopped as soon as it is safe to do so.

INSITE™ Fault Viewer monitors public faults on a J1939 or J1708 network. It helps to isolate the probable cause of a system failure or error.