What Is Fault Code SPN 1592 FMI 19 and FMI 9? (Freightliner)

Proper communication helps build strong relationships. The same can be said for the components of your vehicle. If there is a strong communication system then everything will work well. But if there is a communication breakdown, do not expect your engine to perform well.

The SPN 1592 FMI 19 code talks about communication. There is a problem with the wheel speed sensor and the code will say- J1939 Hrw Wheel Speed Signal Erroneous. That means there could be a wiring problem somewhere.

To learn more about this fault code and others ones in the same category, just continue to read our article. It has the information you want to know about so you can handle the repair with ease. It is an electronic repair so make sure you have the right tools handy.

What is SPN 1592 FMI 19?


The official SPN fault code list simply states that this code means- J1939 Hrw Wheel Speed Signal Erroneous (hrw Received But At Least One Signal Erroneous).

That should indicate a problem with the wheel speed sensor or that there is a problem with the wiring somewhere. When you see this code, you should also see the CEL light illuminated. If you do not understand what CEL means, those letters stand for check engine light.

The good news is that you should not face any problems with your engine. There should be no threat of derate at any time this problem exists. There is a chance that 2 other codes may be set at the same time.

If you get SPN 168 at the same time, you need to repair the battery voltage issue before moving on to fix this problem. If you see SPN 625 FMI 9 then you have a problem with the CAN line and it needs to be repaired first.

Each step must be verified before clearing the code. If you do not get either code, then you are to do the following:

Check for proper configuration of the CPC against the server information. Does the CPC have the proper configuration?

a. Yes; determine which modules are configured for the vehicle and their communication status. Once this is done, follow the appropriate module communication troubleshooting procedures for the affected module. For wiring schematic information, refer to Original Equipment Manufacturer (OEM) literature.

b. No; make corrections to the configuration of the CPC” (source)

Those are the only steps you need to take to resolve this problem. The repair above is for the GHG 17 code that follows the FMI code. There is also a GHG 14 code that has a longer set of instructions which you should read just in case that number is added to the SPN 1592 FM 19 code.

SPN 1592 FMI 9


This code is telling you that there is a problem with the communication in the ABS system. The code actually reads- J1939 Hrw Message From Abs Is Missing (hrw Not Received In Case Newamt Transmission Used).

The same data sheet we linked to above tells you that the CEL will be illuminated but that there will be no impact on your engine’s performance. It also tells you to fix the same codes mentioned above if they are set at the same time.

Get those repairs out of the way first and you may not have to deal with step three as the code should clear. Step #3 only says:

Check for proper configuration of the CPC against the server information. Does the CPC have the proper configuration?

a. Yes; refer to the OEM diagnostics for troubleshooting the loss of communication to the ABS module.


c. No; check for proper parameter configuration of the CPC against the server information.”

This is not going to be a difficult repair when you see this code. When you own your car, you should regularly check for updates for the different modules. This will spare you any delays if you can keep those modules updated with current parameters and information.

SPN 1592 FMI 13


On the official SPN fault code list, there is a third FMI number you should be aware of. This code stands for - J1939 Hrw Wheel Speed Signal Missing (hrw Received But At Least One Signal Not Available).

This code also has 2 sets of GHG codes following the FMI code, they are 14 & 17 also. The instructions to repair this code and clear it are the same as above. Clear the two SPN codes that may show up first before handling this code.

The instructions for the GHG 14 option are as follows:

1. Connect DDDL/DDRS 7.08 SP2 or higher.

2. Check for multiple codes:

a. If Common Powertrain Controller (CPC4) SPN 168/FMI (any) (battery voltage) (Charging System) faults are present, troubleshoot these first.

b. If Controller Area Network (CAN) line faults SPN 625/FMI (any) are present, repair the Controller Area Network (CAN) line faults.

c. If only a J1939 Error fault is present, Go to step 3.

3. Has the Common Powertrain Controller (CPC4) been recently reprogrammed?

a. Yes; ensure the parameters are configured correctly for the vehicle application; refer to the Application and

Installation Manual for the correct parameter configuration, if the configuration is correct, refer to the Original

Equipment Manufacturer (OEM) material for J1939 troubleshooting for the affected module.

b. No; Go to step 4.

4. Turn the ignition OFF (key OFF, engine OFF) and disconnect DDDL/DDRS, Wait five minutes for all modules to power down.

5. Turn the ignition ON (key ON, engine OFF).

6. Reconnect DDDL/DDRS 7.08 SP2 or higher. Are fault codes active?

a. Yes; Refer to section "SPN 625/FMI 9 – EPA10 - GHG14" for further PT CAN troubleshooting.

b. No; clear faults codes and release vehicle.

Some Final Words

When you get involved in repairing codes, make sure to check those last three letters. There can be different instructions for GHG and EPA codes and sometimes the numbers that follow them have different information you need to know about.

Repairing engines keeps getting more complicated.

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