What Is Fault Code SPN 3359 FMI 31? (Allison Transmission) (2024)

Once those amber and red lights get illuminated on your dash, you need to get more information. That is what the SPN FMI code system is all about. Unfortunately, some of these codes just do not bring the information you need.

You are not going to like the meaning of this code. The official SPN FMI list simply says - Transmission Service (filter Life Monitor). The FMI portion of the code will only state, a condition exists. Which is information you already know about.

To learn more about this code and similar ones related to SPN 3359, just continue to read our article. It explores these codes to give you the best information possible and save you search time. Getting you back on the road quickly is one of our goals.

Code SPN 3359

Allison Fault Code SPN 3359 FMI 31

Allison SPN 3359 FMI 1

Allison Transmission SPN 3359 FMI 18

Allison Fault Code SPN 3359 FMI 31

What Is Fault Code SPN 3359 FMI 31? (Allison Transmission) (1)

What happens when you see this code illuminated on your dash along with the check transmission light is you are going on a treasure hunt. Unfortunately, this hunt doe not bring a nice monetary reward.

Instead, it will lead you to a possible source of the problem. This Allison code is very generic and does not tell you anything you do not already know. The only clue you have is the words in brackets- Transmission Service (filter Life Monitor).

However, in this particular case, it may not be the transmission filter that is the problem. It may be a bad connector which is what happened to one owner. His story is long but one shop said the transmission was missing a wire which is almost unheard of.

The real source for this code popping up on his dash was that there was a broken pin connector that would not connect to the #80 connector in the transmission.

If the first diagnosis does not sound right, it probably isn’t or it may not be accurate. Until you do the search, you do not know where the problem lies when this code appears.

Also, this fix may or may not be under warranty and you would have to check with several companies associated with your RV to find out if it is or not. The cost of this repair at that time was $800.

Allison SPN 3359 FMI 1

What Is Fault Code SPN 3359 FMI 31? (Allison Transmission) (2)

There are codes that are very straight forward and tell you exactly what is going on in your engine or transmission or other module systems. This is one of those codes.

Allison SPN 3359 FMI on the official code list only says- Transmission Filter Maintenance Required (p088b). But on one data sheet, it defines the code as- Transmission Filter Maintenance Required – Low-Most Severe (3).

We put the words in bold to make sure you caught that discrepancy. The reason for the discrepancy is that the FMI portion of the code refers to oil and not transmission fluid. This may not be an important distinction but we wanted you aware of this issue.

The numbers in the bracket for the first definition are the correct Allison fault code for this problem. The sheet we will link to later, says this fault code is telling you that you have a ‘very deteriorated filter.’

If that is the case, then we understand why the other data sheet, written for US army vehicles only, says this fault code is most severe. Most likely, when you see this code, you need to change the transmission filter as quickly as possible.

If you do not take care of it right away, you may suffer more severe damage to your engine or transmission.

Allison Transmission SPN 3359 FMI 18

What Is Fault Code SPN 3359 FMI 31? (Allison Transmission) (3)

According to one sheet of codes, this SPN FMI code may translate into Allison fault code Po88a. If that is correct, then that is the same information as SPN 3359 FMI 16 which also equals Alllison P088a.

On the official SPN fault code list the latter code states- Transmission Filter Maintenance Alert (p088a). P088a means- deteriorated filter. In other words, the problem is basically the same as P088b but not as severe.

You will need to change the transmission filter to get the code to disappear. This Allison code will appear on page 32 of the set of Allison codes we will link to in the next section.

Just so you know, there were no data sheets, no discussion forums, or other information popping up for either SPN 3359 FMI 18 & FMI 16. The best we can say is that if you have doubts about this code, talk to your local Allison repair shop to get more accurate information and repair steps.

This is not a code that you want to drive 500 or even 100 miles when it is illuminated. You can drive locally to the repair shop but long distance is out of the question.

Some Final Words

While some codes are not very informative, others point you to the exact problem you need to deal with. Unfortunately, you never know which is which until you click on the fault code and see what it says in its explanation.

It is fortunate that the official SPN fault code list does place some of Allison’s fault codes in its explanations making finding the reason for the code easier. That link will also provide Allison’s contact information in case you have a problem that is not covered by that manual.

What Is Fault Code SPN 3359 FMI 31? (Allison Transmission) (2024)


What does FMI 31 mean? ›

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. Monitored Parameter.

How to clear fault codes on Allison transmission? ›

To clear inactive codes, press and hold the MODE button for 10 seconds. Some codes are self-clearing and others require ignition cycles to clear.

What is a transmission oil filter restriction switch? ›

An oil filter restriction sensor device for warning the operator of an internal combustion engine when the engine oil filter has become restricted and requires replacement comprising a sensor body and a threaded adapter for mounting the sensor body between the engine mounting bracket and an oil filter having a filter ...

How to reset Allison transmission filter life? ›

If the WRENCH ICON remains on or flashes, this indicates there is a service issue relating to clutch, filter or fluid life. For either a push button or bump lever shift selector, press and hold the MODE button for approximately 10 seconds while in Filter Life Monitor mode.

What is the engine code for the FMI 31? ›

The SPN 23 FMI 31 code indicates that the engine is not receiving the proper amount of fuel. This can be caused by a variety of issues, including a clogged fuel filter, a faulty fuel pump, or a problem with the fuel injectors.

What does spn and fmi mean? ›

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.

What happens if you don't change transmission filter? ›

This will prevent it from being able to do its job, which, in turn, will cause contaminants to get away and could potentially cause damage to the transmission. Determining if the transmission filter needs to be changed can be a challenging task since it's located in the transmission.

How do you detect a clogged transmission filter? ›

Difficulty Shifting Gears

If you find it challenging to shift gears smoothly or experience resistance when changing gears, it could be a sign of a clogged transmission filter. The filter's obstruction can restrict the flow of transmission fluid, making it difficult for the transmission to shift gears smoothly.

How often should I change my transmission oil filter? ›

If you drive manual, most manufacturers will recommend changing your transmission fluid every 30,000 to 60,000 miles. If you have automatic, you can typically boost that range up to 60,000 to 100,000 miles. There's no harm in changing your fluid early.

How often should you change Allison Transmission filter? ›

Filters must be changed at or before recommended intervals. Table 2 (2000/3000 Hour Based Maintenance) and Table 3 (4000/6000 Hour Based Maintenance) list the equivalent mileage based on the Allison recommended change intervals for Allison Approved TES 668TM or TES 295® approved fluids.

What goes wrong with Allison Transmission? ›

Rough Shifting

This is usually in relation to the 10-speed Allison transmission duramax problems. The bulk of these complaints can be traced down to trivial factors. Some include inadequate transmission fluid levels, dirty transmission filters, or worn-out clutch packs.

Can you reprogram a Allison Transmission? ›

After you submit your Allison training certificate, you will receive an automatic acknowledgement. A second email will be sent when you are authorized for reprogramming. Select 'Reactivate' while online and reprogramming will be enabled.

What does FMI stand for codes? ›

Page 1. Failure Mode Identifier (FMI) Codes on J1939 data link. The FMI is used along with the SPN to provide specific information that relates to a diagnostic trouble code (DTC). The FMI may indicate that a problem with an electronic circuit or an electronic component has been detected.

How to get cummins out of derate? ›

When your truck is under Derated, you have to do the following step by FCAR truck scanner if there is not physical part failure:
  1. Go Diesel Engine, select Cummins, it will show couple DPF/DEF/Aftertream related codes. ...
  2. Under Cummins main menui, selction Action Test to find Forced Regen Option to start Forced Regen.

What is the code FMI 31 on a Cummins SPN 4364? ›

This fault code indicates that the nox emissions are not being reduced enough by the SCR catalyst. There are many possible causes for this fault code including: Degraded DEF fluid. A faulty SCR catalyst.

What is the code spn521052 FMI 31? ›

SPN 521052/FMI 31

Description This Code Sets When SPN 521050/FMI 31 has been Present for One Hour of Idle Time, the Vehicle has been Restarted or Six Gallons of Fuel has been Used.

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