Freightliner spn 521049 fmi 31.

1. Using DiagnosticLink® Standard, check SPN 2791/FMI 31 extended data record #3 "physical data." Refer to the chart below for the reserved extreme parameter value. Table 2. Reserved Extreme Parameter Action to Take 3,4,9,10,22,23,65535 Go to step 2. 15,255 Go to step 5. 8,11 Go to step 9. 5,7,20 Replace the EGR valve actuator.

Freightliner spn 521049 fmi 31. Things To Know About Freightliner spn 521049 fmi 31.

3556 fmi 18 or SPN 3556 18 Detroit DD15 Engine | Demand Detroit Detroit Diesel Engines Fault Codes List online ... SPN 521049 FMI 31 GHG17 DEF ... - DD15 troubleshooting Detroit Diesel Fault Codes | TruckManuals.com Detroit Diesel Engines PDF Service Repair Manuals ... DD15 Engine - Section 17.3 SPN 1077/FMI 14 | Detroit ...SPN 100/FMI is typically low engine oil pressure. 26.1.1 Low Oil Pressure Check Check as follows: 1. Check for multiple codes. [a] If fault codes 100/1 and 100/3 are both active, refer to section 26.2.1. [b] If fault codes 100/1 and 100/4 are both active, refer to section 26.3.1 [c] If only fault code 100/1 is active, go to step 2. 2.FMI 31: Soot load percent condition exists. This means that the DPF has a high soot load percentage, which may affect the performance and fuel economy of the engine. The driver should follow the instructions on the instrument cluster to perform a regeneration. The SPN 3719 code can be caused by various factors, such as:3ALACWDT1GDHL8580 Have code: SPN: 4364. FMI: 31 Hello!!! I'm still waiting. Technician: Joe Green. Okay, this code indicates an issue with the SCR system. It's the system after the DPF that uses DEF to clean NOx emissions. There are a lot of different causes for this code such as EGR issues, exhaust leaks, exhaust leaks, NOx sensors, failed ...

This document will guide the user through necessary steps to properly diagnose active SPN 3251 FMI 21. SYMPTOMS Diagnostic Trouble Codes: DTC/Light Description Status SPN 3251 FMI 21 DPFDP excessively low ANY Customer Observations or Concerns: - Check engine light - SPN 3251 FMI 21 ­ Black Smoke - Exhaust Fumes in Cab SPECIAL TOOLS / SOFTWAREHelp with J1939 DTC codes. Hi there, trying to decode the following: TxId: 33 SPN: 520941 - Manufacturer Assignable SPN FMI: 3 (Voltage Above Normal) Count: 3. TxId: 11 SPN: 520216 - Manufacturer Assignable SPN FMI: 31 Count: 31. Any insight as to what these mean?WARNING!!: ⚠️⚠️⚠️Always use the proper tools and safety equipment to perform this job. Failure to perform the job correctly can result in personal injury or ...

On a 2017 freightliner Cascadia VIN. 3AKJGLDR8HSHF1248 I'm getting codes SPN 520372 FMI 16, SPN 521049 FMI 31, SPN 521050 FMI 31, and SPN521052 FMI 31. The DEF qualit, quantity and doser are workingpr … read moreGood morning, I have a Freightliner 2018 VINHF6352. Codes: SPN-3216 10 SPN-3223 7 SPN-520363 SPN-520372 SPN-520372 14 SPN-521049 31 SPN-521052 31 SPN-605 5 ... SPN 521049 FMI 31, SPN 521050 FMI 31, and SPN521052 FMI 31. The DEF qualit, quantity and doser are workingpr ...

Second Opinion] WORKING ON 2016 FREIGHTLINER HAVE CODE FMI 3868,4677,4572,3714,3712 DEF LIGHT FLASHING ON THE PLUG HAVE - Answered by a verified Technician. ... 2018 FREIGHTLINER M2 106 Vin# ***** DD5 5.1DTC SPN 521049 FMI 31 SPN 521052 FMI 31Anyone familiar with these codes?2 SPN 520371/FMI 16 - GHG17 Selective Catalyst Reduction Closed Loop Control at Maximum Limit (Multiples Sources) Table 1. ... Is DEF percentage between 31 and 34%? a. Yes; Go to step 3. b. No; clean/flush the DEF tank. Go to step 3. Refer to section "Flushing of the Diesel Exhaust Fluid System". 3. Unbolt the DEF dosing unit from the ...2011 my 45 freight liner with 6.7 Cummins, has code spn 3360 fmi 9. Replace controller still has code. ... I have a 2012 Freightliner box truck with a 6.7 Cummins in it, throwing a 1569 FMI 31, 3360 FMI 02, and 5246 FMI 00.Some sort of DEF fault, ... Customer: SPN 1569 FMI 31 JA: Is there anything els ...2019 freightliner cascadia has these codes spn 521049 FMI31, SPN521050 FMI 31 and SPN 521052 FMI 31. it has derate to about 5 mph. did a regen with computer couple times its finishing it no ... for mike "mcmillan only" 2016 freightliner both amber engine lights illuminated no drivability issues has codes spn 1569 engine protection …Get ratings and reviews for the top 7 home warranty companies in Leander, TX. Helping you find the best home warranty companies for the job. Expert Advice On Improving Your Home Al...

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DESCRIPTION: Diesel Exhaust Fluid (DEF) pump speed low. MONITORED PARAMETER: DEF pump speed. TYPICAL ENABLING CONDITIONS: DEF pump enabled and cannot …

Freightliner Forum > Cascadia DD15 Doser Injector Discussion in 'Freightliner Forum' started by shaneWalker, Nov 27, 2014. Page 4 of 7 < Prev 1 2 3 ... SPN: 521052 FMI:31 59F3FF - SPN: 521049 FMI: 31 Volvo 2015, May 6, 2019. Volvo 2015, May 6, 2019 #36. May 6, 2019 #37. Volvo 2015 Bobtail Member. 32 3. Jun 10, 2018 0. I force Regen with ... 2 SPN 521049/FMI 7 Split Pin Sticking in the Retracted Position This fault indicates that the TCM detected a stuck/binding split pin during a shift request. Perform the split pin bushing repair. Refer to section "Split Rod Bushing Repair". 2 SPN 521049/FMI 7 4 All information subject to change without notice. SPN 5357/FMI 16. Description Fuel Quantity High Detected. Monitored Parameter Injector Quantity. Typical Enabling Conditions Steady State Drive & No Regen. Monitor Sequence None. Execution Frequency Continuous when enabling conditions met. Typical Duration 2 Minutes. Dash Lamps MIL, CEL. Engine Reaction Derate 25%.On a 2017 freightliner Cascadia VIN. 3AKJGLDR8HSHF1248 I'm getting codes SPN 520372 FMI 16, SPN 521049 FMI 31, SPN 521050 FMI 31, and SPN521052 FMI 31. The DEF qualit, quantity and doser are workingpr … read moreJust threw code FMI 31, SPN 4364. I just bought the truck and started driving it 2 days ago, - Answered by a verified Technician. We use cookies to give you the best possible experience on our website. ... SPN 3936 FMI 15 & SPN 1569 FMI 31.. 2016 Freightliner cascadia, Cummins is engine. ...1. J1939, J1587, & J1708- This is the system under which most fault codes operate. The first number refers to the hardware like wires, etc while the second and third numbers refer to the non-tangible communication that takes place over the J1939 system. Cummins uses the J1939 system. 2.WARNING!!: ⚠️⚠️⚠️Always use the proper tools and safety equipment to perform this job. Failure to perform the job correctly can result in personal injury or ...

SPN 521049/FMI 31. 2 SPN 521050/FMI 31 - GHG17 DEF Inducement SEL Lamp Active Table 1. Read PDF Spn 2791 Fmi 7 8 9 14 1216 10 Freightliner Trucks Literate programming is a programming methodology that combines a programming language with a documentation. Fault Codes Descriptions Source Module SPN FMI Description; TCU: 36: 7:.SPN 521049/FMI 31 - GHG17 DEF Inducement DEF Lamp Active. 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 …On a 2017 freightliner Cascadia VIN. 3AKJGLDR8HSHF1248 I'm getting codes SPN 520372 FMI 16, SPN 521049 FMI 31, SPN 521050 FMI 31, and SPN521052 FMI 31. The DEF qualit, quantity and doser are workingpr … read moreSPN 3216 (ACM) (GHG17) June 2018 Additions, Revisions, or Updates Publication Number / Title Platform Section Title Change DDC-SVC-MAN-0200 DD8 MD SPN 3216/FMI 16 - GHG17 Step 3 and Step 4 has been updated DDC-SVC-MAN-0193 DD5 MD SPN 3216/FMI 16 - GHG17 DiagnosticLink users: Please update the troubleshooting guides in DiagnosticLink with this ...2017 Freightliner M2 Fault SA: 33 Bulkhead SPN: 524264 FMI: 2017 Freightliner M2 Fault SA: 33 Bulkhead SPN: 524264 FMI: 4 Freightliner M2 106 … read more. Wayne. Journeyman.SPN 5357. FMI 18. Fuel quantity low detected. if any other fault codes are active, fix those first. Probable causes: 1) failed intake manifold temperature sensor. 2) Intake manifold temperature sensor connector/harness. 3) EGR delta P sensor. 4) EGR delta P sensor connector/harness.2013 Freightliner M2 with a Cummins isl9 Have Code SA:0 Engine SPN:1569 FMI:31 Wasnt on before truck was taken to shop for clutch and now is on along with the yellowlight on in the def tank guage ... 2019 freightliner code SPN 524249 FMI 7 - our software said missing smart switch, were able to see wihich switch and change out. (PTO switch.)

Oct 19, 2020 · SPN 521049/FMI 31 - GHG17 DEF Inducement DEF Lamp Active Table 1. 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. It shows codes apn 521049 fmi 31, spn 521050 fmi 31 spn 521052 fmi 31, spn 520372 fmi 16 and 520349 fmi 14. ... Hello, I have a 2015 Freightliner 114SD with code 4374 fmi 1, I replace 2 Nox sensors, DPF filter, still does not finish the regen Volvo VNL 780 ... SPN-3216 10 SPN-3223 7 SPN-520363 SPN-520372 SPN-520372 14 SPN-521049 31 SPN-521052 ...

EEC 61 543.5 spn fail 7 Freightliner Cascadia 2015 I turn my truck on this morning and then the truck re-engine light turn on to make that . ... I have dd15 and 521049 and 521050 codes are detected i done regen and changed nox scencors inlet and outlet but codes ... Freightliner Cascadia 2012 Detroit Engine DD15 ENG 2 SPN 3464 FMI 31 Throttle ...On a 2017 freightliner Cascadia VIN. 3AKJGLDR8HSHF1248 I'm getting codes SPN 520372 FMI 16, SPN 521049 FMI 31, SPN 521050 FMI 31, and SPN521052 FMI 31. The DEF qualit, quantity and doser are workingpr … read moreFeel like your pillow's a leaden lump and reached the end of its life? Try throwing it in the dryer with some tennis balls as a last-ditch rescue effort. It might just (literally) ...SPN 3216 (ACM) (GHG17) June 2018 Additions, Revisions, or Updates Publication Number / Title Platform Section Title Change DDC-SVC-MAN-0200 DD8 MD SPN 3216/FMI 16 - GHG17 Step 3 and Step 4 has been updated DDC-SVC-MAN-0193 DD5 MD SPN 3216/FMI 16 - GHG17 DiagnosticLink users: Please update the troubleshooting guides in DiagnosticLink with this ...SPN#1323, FMI#31. engine switch to the OFF. position (TM 5-3895-385-10), and replace cylinder number 1. injector (WP 0338, Vol 2). 2. If fault code in not displayed, proceed to next test. 11.Check active engine faults. 1. If other fault codes are. screen for any other fault code. displayed, turn keyless engine.SPN 3216 (ACM) (GHG17) June 2018 Additions, Revisions, or Updates Publication Number / Title Platform Section Title Change DDC-SVC-MAN-0200 DD8 MD SPN 3216/FMI 16 - GHG17 Step 3 and Step 4 has been updated DDC-SVC-MAN-0193 DD5 MD SPN 3216/FMI 16 - GHG17 DiagnosticLink users: Please update the troubleshooting guides in DiagnosticLink with this ...2 SPN 3216/FMI 21 – GHG14. Table 1. Selective Catalyst Reduction (SCR) Inlet NOx Sensor - Drift (Low Box). EGR Mass Flow greater than .08 kg/s, Engine Speed 1450-1900 RPM, Engine Torque 1400-2100 N·m, Battery Voltage greater than 11 vDC, Coolant Temperature greater than 65°C (149°F), Ambient Temperature greater than -8°C (18°F) …For a DD engine The sensor is located on the 1 box closest to the front tire, It is fairly easy to get to if you remove the side cover, It takes a 7/8 sensor socket most of the times a wrench will take it off and you can cut the lead off at the sensor to use the box end if needed. the sensor module is just below the pressure sensor to metric cap screws and 1 plug.

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Fault code 524017 31. 2018 freightliner cascadia. Nothing yet trying to figure out the code - Answered by a verified Technician. We use cookies to give you the best possible experience on our website. ... SPN 523010 FMI 31 SPN 524042 FMI 19 They are on a Freightliner Cascadia.

Get ratings and reviews for the top 11 lawn companies in Clarkston, GA. Helping you find the best lawn companies for the job. Expert Advice On Improving Your Home All Projects Feat...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 [PDF] DDC-SVC-MAN-0193: SPN 3216 (ACM) (GHG17)FMI 16: Engine. SPN 3216/FMI 16. Description. NOx Sensor Plausibility Check. ... Year 2019-2022 Freightliner Cascadia; and Western Star 47X 48X …2018 FREIGHTLINER M2 106 Vin# ***** DD5 5.1DTC SPN 521049 FMI 31 SPN 521052 FMI 31Anyone familiar with these codes? ... 2018 Freightliner M2 SPN 5394 Fmi 5 Asked before and replaced doser and reset DEF system, no issues until todaySame code but add the little amber dot under the DEF level green bars is solid.The code i am getting is SPN 723 FMI 31 ENGINE SPEED SENSOR I replaced both cam and crankshaft sensors, check ecm terminal to see if it was dirty/oily, but wasnt. I towed it to Freightliner, lets see what they say gtilogistics, Aug 18, 2015. gtilogistics, Aug 18, 2015 #5. Honeybeenorris Thanks this. Aug 18, 2015 #6. mhyn Road …The SPN 2791 FMI 11 code stands for the Motor Control Module (MCM) Detects that the Exhaust Gas Recirculation (EGR) Valve Position is Incorrect or a High ... What is Freightliner code SPN 2791 FMI 2? ... What is interesting is that SPN 2791 FMI, 8, 9, 11, 14, or 31 are said to have the same procedure. You can read about that procedure at this ...SPN: 521049 FMI: 31. Description: DEF Inducement DEF Lamp Active Troubleshooting: 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 ...SPN 605 FMI 5. 2014 Fr8 Cascadia - Answered by a verified Technician. ... Codes: SPN-3216 10 SPN-3223 7 SPN-520363 SPN-520372 SPN-520372 14 SPN-521049 31 SPN-521052 31 SPN-605 5 ... I have the code spn 5246 fmi 0. Freightliner cascadia 2015. hi JA: Hello. How can I help? Customer: I have the code spn 5246 fmi 0 JA: What's the make/model/year of ...Freightliner SPN Fault Code Guide Download. PARAMETER IDENTIFIERS (PIDS) Parameter IDs or PIDs are numbers and names used to identify the displayed data. So think if the PID is in terms of "readings" such as oil temperature, coolant level, distance traveled, engine rpm and so on. PID is a J1708 term and PID is 0 to 511.It shows codes apn 521049 fmi 31, spn 521050 fmi 31 spn 521052 fmi 31, spn 520372 fmi 16 and 520349 fmi 14. All three engine lights are o ... Spn 5246 fmi 15. 2014 freightliner cascadia dd15. The dpf. Yes the dpf clamps were left loose which melted the def dosing unit, ...1 02 05-17. 1 02 05-17. SUBJECT DATE SPN 521052 (MCM) (GHG17) February 2017. Additions, Revisions, or Updates. Publication Number / Title Platform Section Title Change DDC-SVC-MAN-0193 DD5/DD8 SPN 521052/FMI 31 - GHG17 This is a new diagnostic for MDEG. DiagnosticLink users: Please update the troubleshooting guides in DiagnosticLink with this ...Technical Service Bulletins (TSB) for 2017 Freightliner Cascadia. Search. Your OBD-II Trouble Codes Repair Site. Home; Trouble Codes; FAQs; Forums; Store; Search; ... SS 1033351 New Cascadia Fault Coed SA 33 SPN 520197 fmi 31 MQ Switich Bus - Malfunction . Communication Number: DOC-1033351, Date: 2018-03-02 ... 0206-17_ SPN 521049 (MCM) (GHG17)

2 SPN 521012/FMI 1 - GHG17 Fault Reaction Manager - Intake Manifold Pressure Too Low Table 1. SPN 521012/FMI 1 Description This Fault Code Sets When There Is A Low Boost Fault Code Present Monitored Parameter Intake Manifold Pressure Faults Typical Enabling Conditions Engine Coolant Temperature greater than 65°C (149°F) Engine Speed greater ... 2014 Freightliner Cascadia. Engine Code: SID-14 4 Relay Diagonal 1. SPN-802 4 Relay Diagonal 1. SID-15 4 Relay Diagonal 2. SPN-803 4 Relay Diagonal 2. Answered in 43 minutes by: Technician: Keiphun Sowell.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.20 = Data Drifted High (rationality high) 21 = Data Drifted Low (rationality low) 22 to 30 = Reserved for SAE Assignment. 31 = Condition Exists. Get information about Suspect Parameter Number (SPN) and Failure Mode Identifier (FMI) fault code list and read descriptions before engine troubleshooting diy process.Instagram:https://instagram. publix cooked turkey for thanksgiving Spu 49 spn 523531. Fail 31, 2012 freightliner casciada, Trying to figure out what code is. Truck is shutting - Answered by a verified Technician. We use cookies to give you the best possible experience on our website. ... These two codes came up: SA 49 SPN 523531 FMI 3 ... who is dale hay on chicago fire tv show I have a freightliner with these codes. spn523512 fmi31,spn3720fmi15,spn523531fmi31,spn521317fmi4,sid254fmi4,and - Answered by a verified Technician ... 2019 freightliner cascadia has these codes spn 521049 FMI31, SPN521050 FMI 31 and SPN 521052 FMI 31. it has derate to about 5 mph. did a regen with computer couple times its finishing it no ... home depot hours toledo 2 SPN 521049/FMI 31 - GHG17 DEF Inducement DEF Lamp Active Table 1. 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. weather in potomac maryland Fix the def issue first. Then go to instrumentation and use the search bar to find the larmf compensation factor. Run back to back nox conversion efficiency tests until the value hits 1.0 I’ve see a lot of these codes as well and I’ve had to replace the nh3 sensors on a few that kept coming back and that took care of the issue.Reprogramming and emission label replacement corrects various fault code issues such as "SPN: 1636, FMI: 16 - CAC Efficiency Low", "SPN: 2659, FMI: 0 - EGR Flow Target Error", and "SPN: 520372, FMI: 16 - SCR Closed Loop Control At Maximum Limit.". There are approximately 457 engines affected by this Field Service Campaign. jenni rivera autopsy photos FMI 31: Soot load percent condition exists. This means that the DPF has a high soot load percentage, which may affect the performance and fuel economy of the engine. The driver should follow the instructions on the instrument cluster to perform a regeneration. The SPN 3719 code can be caused by various factors, such as:FMI 5 SPN 524071 FMI 31 SPN 563 FMI 9 My truck is a Freightliner Cascadia - Answered by a verified Technician. We use cookies to give you the best possible experience on our website. ... SPN 521049 FMI 31, SPN 521050 FMI 31, and SPN521052 FMI 31. The DEF qualit, ... appointment for dmv homestead The SPN 2003 FMI 31 code may be relegated to the Blue Bird Buses that have been made prior to 2016 approx. It is telling you to change the trans spin on the. ... Freightliner Code SPN 2003 FMI 31. We looked at the Freightliner code list and there were several J1939 codes listed. One was for the FMI code and 31 just says 'condition exists'. may your whole life prove that god is good lyrics 2018 FREIGHTLINER M2 106 Vin# ***** DD5 5.1DTC SPN 521049 FMI 31 SPN 521052 FMI 31Anyone familiar with these codes? ... 2019 freightliner cascadia has these codes spn 521049 FMI31, SPN521050 FMI 31 and SPN 521052 FMI 31. it has derate to about 5 mph. did a regen with computer couple times its finishing it no problem bu ...2018 FREIGHTLINER M2 106 Vin# ***** DD5 5.1DTC SPN 521049 FMI 31 SPN 521052 FMI 31Anyone familiar with these codes? ... 2019 freightliner code SPN 524249 FMI 7 - our software said missing smart switch, were able to see wihich switch and change out. (PTO switch.) fresh food town On a 2017 freightliner Cascadia VIN. 3AKJGLDR8HSHF1248 I'm getting codes SPN 520372 FMI 16, SPN 521049 FMI 31, SPN 521050 FMI 31, and SPN521052 FMI 31. The DEF qualit, quantity and doser are workingpr … read moreSPN 3216 FMI 21 AND SPN 3223 FMI 7ON A DD 13. 2015 FREIGHTLINER SD122. I HAVEN;T DONE REALLY ANYTHING YET, THINKING - Answered by a verified Technician. ... Codes: SPN-3216 10 SPN-3223 7 SPN-520363 SPN-520372 SPN-520372 14 SPN-521049 31 SPN-521052 31 SPN-605 5 ... income tax place el dorado arkansas EPA07/10/GHG14 DDEC VI/10 Electronics and Troubleshooting Manual (DDC-SVC-MAN-0084) | 416 SPN 3711 (MCM) (EPA10;GHG14) | 416.1 SPN 3711/FMI 31 - EPA10 - GHG14 The fault indicates that the High Idle Regeneration (HIR) was aborted due to the Diesel Oxidation Catalyst (DOC) inlet temperature not reaching the minimum of 270°C (518°F) to ...2017 Freightliner m2 with dd13. shut down for no oil pressure, replaced sensor still had no oil pressure, verified with gauge. will build to 30psi then fall to 0. replaced suction manifold and orings ... SPN 52105 to FMI 31, SPN 5841 FMI 14, SPN 521049 FMI 31, ... wegmans dewitt Code spn 517653 fmi 7 2015 Freightliner Cascadia. Truck. Yes Tried to hit starter N also check batteries Seems also I got 12.2 volts so that's prob y u can't start truck But I got lots of faulty cosws Codes ... Codes: SPN-3216 10 SPN-3223 7 SPN-520363 SPN-520372 SPN-520372 14 SPN-521049 31 SPN-521052 31 SPN-605 5 ... hallelujah lyrics and chords in g I have a ABS fault code on a 2024 Freightliner cascadia VIN: 3AKJHLDRXRSVF0057 SPN: 520216 FMI: 31. This fault code does not come up active in the webco toolbox contacted webco tech support they told me that it is on freightliner chassis side. Waco told me that this is a known issue with this year make model truck built in Mexico this truck was ...485.1 SPN 521049/FMI 31 - GHG17 Check as follows: 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.