Sfu 49 Freightliner Code (2024)

FAQs

Sfu 49 Freightliner Code? ›

SFU49 is a generic code for the modular switch field. That is not the complete fault code information. You will need to use your mode reset button to scroll to the subsequent screens to get all of your fault code numbers and then you would troubleshoot those numbers individually.

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.

“Eng 1” indicates there is an engine related fault stored in the motor control module.

If the car's computer ever encounters a problem, a fault code or Diagnostic Trouble Code (DTC), will be stored within the car's ECU memory. With a scanner plugged into the car's On-Board Diagnostics (OBD) port you can read the list of codes stored, and therefore find out what the problem is.

Simply place your key into the ignition and turn it on for 1-2 seconds, then turn it off for 1-2 seconds. Repeat this step three or four times. If the check engine light remains after the reset, you might still have a problem with your vehicle.

Leaving the battery disconnected for a few minutes will ensure the vehicle systems will completely reset when you reconnect the battery. Secure the negative cable back to the terminal and cover it with the cap. Disconnecting the battery will clear the error codes and reset the check engine light.

A truck Engine Control Module, or the ECM, is often times referred to as the engine's “brain”. The ECM is a computer that is attached to the side of the engine with functions such as receiving data from different sources on the truck (input) as well as reporting events or conditions (output).

SPN 3599/FMI 4

Description This Code Sets When the Aftertreatment Control Module (ACM) Detects a Short to Ground on Pins 9, 15, or 39.

What does a NOx sensor do in a commercial truck? There are two NOx sensors in an HD truck's aftertreatment system, one on either side of the SCR. The inlet sensor measures the nitrogen oxide (NOx) levels in the exhaust before it passes through the SCR and reports this data to the ECU.

The P2015 code stands for “Intake Manifold Runner Position Sensor /Switch Range/Performance (Bank 1).” It's triggered when the PCM detects that the signal in the Bank 1 intake manifold runner position sensor is out of range. A malfunctioning intake manifold position sensor is one of the most common causes for the code.

What is the code for transmission failure? ›

A failing transmission can cause the P0700 code. Mechanical wear causes excessive metal buildup in the transmission, which means that the transmission needs to be rebuilt or replaced. Metal flakes in the transmission fluid can also result in a P0700 code.

ENG 0 means that there is a loss of communication with the engine ECM. You want to verify your power and grounds going to the ECM. Check between your battery box and ECM for an in-line fuse holder and blown in-line fuse or any corrosion or damage within the wire connectors and wiring between your battery box and ECM.

What are Permanent Diagnostic Trouble Codes? Permanent Diagnostic Trouble Codes (PDTCs) are very similar to regular Diagnostic Trouble Codes (DTCs). However, unlike regular DTCs, they cannot be reset by disconnecting the vehicle's battery or cleared using an On-Board Diagnostic (OBD) scan tool.

Most DTCs can be deleted using an OBD-II scanner, which is a tool used as part of the diagnostic and repair process (allowing mechanics to see if the code returns after a component is replaced, for example). It's also possible to reset a DTC by temporarily disconnecting the vehicle's 12-volt battery.

Most DTCs can be deleted using an OBD-II scanner, which is a tool used as part of the diagnostic and repair process (allowing mechanics to see if the code returns after a component is replaced, for example). It's also possible to reset a DTC by temporarily disconnecting the vehicle's 12-volt battery.

If the problem has been fixed, but the “Reduced Engine Power” light is still on, you may need to reset the car's onboard computer. This can be done with an OBD diagnostic tool or by disconnecting the battery for a few minutes.