SB_654

Title:
SCR Closed Loop Faults on Detroit Diesel Engines
Number:
SB_654
Release Date:
12/19/23
Revision Number:
Not Applicable
Revision Date:
Not Applicable
Chassis Type:
All custom chassis with a 2016 and newer Detroit engines
Component
Description:
Aftertreatment System & Controls
Subject:
Selective Catalyst Reduction Closed Loop Control at Maximum Limit faults on Pierce apparatus with MY2016 –
2022 Detroit engines.
Purpose/Background:
Detroit recently released an ACM software update v7.61.2.0 to address high occurrences of Selective Catalyst
Reduction Closed Loop Control at Maximum Limit faults on Pierce apparatus with MY2016 – 2022 Detroit
engines.
The updated ACM software includes improvements for the following fault codes:
• SPN 520371 / FMI 16: SCR closed loop control at maximum limit (Multiples Sources)
• SPN 520372 / FMI 14: SCR closed loop control at maximum limit (Timeout)
• SPN 520372 / FMI 16: SCR closed loop control at maximum limit
Detroit Logic:
The engine continually monitors NOx conversion efficiency by comparing NOx levels into and out of the SCR
canister. As conversion efficiency drops below optimum range, DEF dosing is adjusted (usually increased) to
keep NOx conversion efficiency within acceptable limits. If DEF dosing adjustments reach their maximum limit
and conversion efficiency is still below threshold, an SCR Closed Loop fault is triggered.
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SERVICE BULLETIN #654
Repair Process and Warranty Considerations:
The following flowchart outlines the process for requesting the ACM update along with coverage policies for inwarranty and out-of-warranty engines.
MCM and CPC reprogramming may also be required to maintain compatibility with this latest ACM software
version. Auto-elevate is not required for this ACM update to work properly.
Has the truck
experienced any of the
following Closed Loop Faults?
SPN 520371 / FMI 16
SPN 520372 / FMI 14
SPN 520372 / FMI 16
Yes
Are the
fault(s)
active?
Is the truck
within the 5yr
engine warranty
period?
Yes
No
No
Did the
fault(s) occur
within the 5yr engine
warranty
period?
Were there
prior documented
occurrences of these
fault(s) within the 5yr
warranty period?
Yes
Please contact your Detroit
Distributor to schedule service
to clear faults and update
software
This will be covered under
Detroit warranty.
No
Software updates can be made
at the customer’s expense.
Please contact your Detroit
Distributor for a quote.
No
Yes
Create an incident ticket with
Pierce Customer Service for caseby-case review with Detroit.
No
Does the truck
appear on the list
of 126 engines covered
by Detroit Campaign
D23M8?
Yes
Yes
A campaign letter will be sent from Detroit
regarding repairs for this truck. Please contact
your Detroit Distributor to schedule service.
This work will be covered per Detroit Field
Service Campaign D23M8
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No
Treated as any other nonwarranty repair.
Software updates can be made
at the customer’s expense.
SERVICE BULLETIN #654
Trucks Covered Under D23M8:
Engine Serial
Number
471940S0431774
VIN
Job #
Dealer
Customer
4P1BAAGF3HA016910
29624-1
471940S0431898
4P1BAAGF8HA016854
29677-1
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
SOUTH COAST FIRE EQUIP INC
CITY OF CEDAR HILLS FIRE
DEPARTMENT
CITY OF SAN DIEGO
471940S0434111
4P1BCAGF8HA016833
29424-1
BAY DISTRICT VFD INC
471940S0434468
4P1BAAGF5HA016987
29654-1
ATLANTIC EMER. SOLUTIONS, INC MANASS
SUPERIOR EQUIPMENT
471940S0434633
4P1BAAGF9HA016913
29714-1
TEN-8 FIRE EQUIPMENT INC
CITY OF LARGO
471940S0434638
4P1BAAGF4HA016897
29791-1
471940S0434643
4P1BCAGF5HA016949
29616-1
471940S0434859
4P1BAAGF3HA016860
29677-7
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
ATLANTIC EMER. SOLUTIONS, INC MANASS
SOUTH COAST FIRE EQUIP INC
BULVERDE SPRING BRANCH
FIRE AND EMS
FAIRFAX COUNTY FIRE &
RESCUE DEPT
CITY OF SAN DIEGO
471940S0434867
4P1BAAGF8HA016966
29859-1
GANTT FD
471940S0435895
4P1BCAGF0HA016941
29782-1
471940S0438570
4P1BAAGF0HA017013
29822-2
471940S0442411
4P1BCAGF9HA017005
29704-1
471940S0442423
4P1BAAGF4HA017077
29781-1
471940S0442429
4P1BAAGF9HA017057
29752-1
SPARTAN FIRE & EMERGENCY
APPARATUS
SCHUHMACHER FIRE EQUIPMENT
LLC
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
SCHUHMACHER FIRE EQUIPMENT
LLC
RELIANT FIRE APPARATUS INC
471940S0442736
4P1BCAGF2HA017265
29804-2
SUPERIOR EQUIPMENT
SALT LAKE CITY CORPORATION
471940S0442746
4P1BCAGF8HA017030
29749-1
CITY OF EULESS
471940S0442758
4P1BAAGF0HA017187
30016-1
471940S0442785
4P1BCAGF9HA017070
29099-1
471940S0448916
4P1BAAGF8HA017227
29686-1
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
HUGHES FIRE EQUIPMENT INC
471940S0449880
4P1BCAGF1HA017175
29614-1
471940S0449896
4P1BCAGF6HA017267
29893-1
FAIRFAX COUNTY FIRE &
RESCUE DEPT
LONGVIEW FD
471940S0451149
4P1BCAGF0HA017264
29804-1
ATLANTIC EMER. SOLUTIONS, INC MANASS
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
SUPERIOR EQUIPMENT
471940S0451152
4P1BCAGF3HA017291
29756-1
471940S0452322
4P1BAAGF7HA017431
30267-5
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
SOUTH COAST FIRE EQUIP INC
SAN ANTONIO FIRE
DEPARTMENT
CITY OF SAN DIEGO
471940S0452326
4P1BAAGF7HA017302
30078-1
BRIGHTON TWP VFD
471940S0453743
4P1BAAGF2HA017319
30000-1
471940S0453751
4P1BAAGF6HA017484
30277-2
GLICK FIRE EQUIPMENT CO. INC. EAST
FRONT RANGE FIRE APPARATUS
LTD
HUGHES FIRE EQUIPMENT INC
471940S0457591
4P1BAAGFXHA017391
29957-2
HUGHES FIRE EQUIPMENT INC
471940S0457737
4P1BAAGFXHA017441
30310-1
471940S0457746
4P1BAAGF1HA017392
29957-3
SCHUHMACHER FIRE EQUIPMENT
LLC
HUGHES FIRE EQUIPMENT INC
CLACKAMAS COUNTY FIRE DIST
#1
CEDAR HILL FPD
471940S0460297
4P1BCAGF3HA017551
30150-1
TEN-8 FIRE EQUIPMENT INC
471940S0460303
4P1BAAGF6HA017422
30209-1
BAYTOWN FIRE & RESCUE
471940S0460309
4P1BAAGF4HA017483
30277-1
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
HUGHES FIRE EQUIPMENT INC
471940S0460315
4P1BAAGF4HA017421
30197-1
471940S0463284
4P1BCAFF9HA017572
30121-1
ATLANTIC EMER. SOLUTIONS, INC MANASS
FIRE & SAFETY SERVICES LTD
471940S0463402
4P1BAAGF3HA017507
30208-1
FAIRFAX COUNTY FIRE &
RESCUE DEPT
GLOUCESTER TOWNSHIP FIRE
DISTRICT #5
GILROY CITY OF
GOLDEN STATE FIRE APPARATUS
INC
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6
NORTH VIEW FIRE DISTRICT
CENTRAL COUNTY FIRE &
RESCUE
CITY OF DENTON
ALLEN FIRE DEPARTMENT
CENTRAL COUNTY FIRE &
RESCUE
JANESVILLE FIRE DEPARTMENT
COUNTY OF BERNALILLO
ROUND ROCK FIRE
DEPARTMENT
CALDWELL FIRE & RESCUE
SALT LAKE CITY CORPORATION
LONGMONT FD CITY OF
TOWN OF GILBERT
CLACKAMAS COUNTY FIRE DIST
#1
CITY OF MIAMI
TOWN OF GILBERT
SERVICE BULLETIN #654
471940S0463651
4P1BAAGF7HA017512
30311-1
CENTRAL JACKSON CO FPD
30655-1
SCHUHMACHER FIRE EQUIPMENT
LLC
FRONT RANGE FIRE APPARATUS
LTD
FINLEY FIRE EQUIPMENT CO INC
471940S0466809
4P1BAAGF0HA017562
30369-1
471940S0467031
4P1BAAGF4HA017788
471940S0467911
4P1BAAGF6HA017582
30347-1
HUGHES FIRE EQUIPMENT INC
471940S0467920
4P1BAAGF9HA017432
30267-6
SOUTH COAST FIRE EQUIP INC
FORT MCDOWELL YAVAPAI
NATION
CITY OF SAN DIEGO
471940S0469820
4P1BAAGF7HA017655
30285-1
471940S0469831
4P1BAAGF9HA017656
30285-2
471940S0470249
4P1BAAGF2HA017739
30312-1
471940S0471324
4P1BAAGF1HA017618
30535-2
FRONT RANGE FIRE APPARATUS
LTD
FRONT RANGE FIRE APPARATUS
LTD
FRONT RANGE FIRE APPARATUS
LTD
HUGHES FIRE EQUIPMENT INC
471940S0471327
4P1BAAGF1HA017666
30646-1
SUPERIOR EQUIPMENT
471940S0471345
4P1BCAGF2HA017668
30265-1
471940S0473639
4P1BAAGF9HA017849
30594-1
ADAMS COUNTY FIRE
PROTECTION DISTRICT
COMMUNITY VFD
471940S0473648
4P1BCAGF1HA017693
30206-1
FRONT RANGE FIRE APPARATUS
LTD
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
HUGHES FIRE EQUIPMENT INC
471940S0476645
4P1BAAGFXHA017861
30951-1
COMMUNITY VFD
471940S0477846
4P1BAAGF2HA017854
30675-1
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
HUGHES FIRE EQUIPMENT INC
471940S0477849
4P1BCAGF6HA017916
30335-1
METRO WEST FPD
471940S0479081
4P1BAAGF1HA017859
30784-1
471940S0483171
4P1BBAGFXHA017890
30247-1
471940S0483177
4P1BAAGF9HA017981
30772-1
SCHUHMACHER FIRE EQUIPMENT
LLC
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
FRONT RANGE FIRE APPARATUS
LTD
HUGHES FIRE EQUIPMENT INC
471940S0484477
4P1BAAGFXHA018010
30726-1
471940S0484489
4P1BCAGF8HA017917
30363-1
ATLANTIC EMER. SOLUTIONS, INC MANASS
HUGHES FIRE EQUIPMENT INC
471940S0485901
4P1BAAGF0JA018152
30802-1
FAIRFAX COUNTY FIRE &
RESCUE DEPT
CITY OF NORTH LAS VEGAS FIRE
DEPARTMENT
CITY OF MANASSAS
471940S0485907
4P1BAAGFXHA018119
30727-2
471940S0485919
4P1BAAGF0HA017982
30772-2
471940S0487556
4P1BAAGF0HA017819
30501-2
471940S0487562
4P1BAAGF2HA018051
30957-1
471940S0490392
4P1BAAGF1HA018011
30726-2
471940S0492082
4P1BAAGF9HA018189
30726-3
471940S0494158
4P1BAAGF5HA018190
30726-4
471940S0494170
4P1BAAGF5HA018108
30912-1
471940S0495954
4P1BAAGF8HA018118
30727-1
471940S0495969
4P1BCAGF7JA018224
30958-1
471940S0496298
4P1BAAGF9JA018182
30889-1
471940S0497865
4P1BAAGF4JA018199
30721-1
471940S0504945
4P1BAAGF8JA018268
30871-1
471940S0506447
4P1BBAGF3JA018238
30459-1
471940S0508105
4P1BAAGF6JA018270
471940S0508120
4P1BAAGFXJA018269
ATLANTIC EMER. SOLUTIONS, INC MANASS
ATLANTIC EMER. SOLUTIONS, INC MANASS
HUGHES FIRE EQUIPMENT INC
TOWN OF CASTLE ROCK
CITY OF LOGAN
SOUTH ADAMS CO FPD
SOUTH ADAMS CO FPD
ADAMS COUNTY FIRE
PROTECTION DISTRICT
GRESHAM FIRE & EMERGENCY
SERVICES
SALT LAKE CITY CORPORATION
CITY OF MESA
CITY OF SIERRA VISTA
ANNA FIRE DEPARTMENT
WEST METRO FPD
CITY OF HENDERSON
FAIRFAX COUNTY FIRE &
RESCUE DEPT
CITY OF HENDERSON
FRONT RANGE FIRE APPARATUS
LTD
SUPERIOR EQUIPMENT
CITY OF WESTMINSTER
ATLANTIC EMER. SOLUTIONS, INC MANASS
ATLANTIC EMER. SOLUTIONS, INC MANASS
ATLANTIC EMER. SOLUTIONS, INC MANASS
ATLANTIC EMER. SOLUTIONS, INC MANASS
ATLANTIC EMER. SOLUTIONS, INC MANASS
SUPERIOR EQUIPMENT
FAIRFAX COUNTY FIRE &
RESCUE DEPT
FAIRFAX COUNTY FIRE &
RESCUE DEPT
FAIRFAX COUNTY FIRE &
RESCUE DEPT
MARYLAND CITY VFD
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
ATLANTIC EMER. SOLUTIONS, INC MANASS
SOUTH COAST FIRE EQUIP INC
CITY OF ALLEN
30871-3
GLICK FIRE EQUIPMENT CO. INC. EAST
SOUTH COAST FIRE EQUIP INC
PITTSBURGH EMERGENCY
MEDICAL SERVICES
CITY OF PALM SPRINGS
30871-2
SOUTH COAST FIRE EQUIP INC
CITY OF PALM SPRINGS
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DRAPER CITY CORPORATION
FAIRFAX COUNTY FIRE &
RESCUE DEPT
DRAPER CITY CORPORATION
FAIRFAX VOLUNTEER FIRE
DEPARTMENT
CITY OF PALM SPRINGS
SERVICE BULLETIN #654
471940S0510448
4P1BCAGF7JA018448
31093-1
FINLEY FIRE EQUIPMENT CO INC
CITY OF COLUMBUS
471940S0510454
4P1BAAGF7JA018410
31122-1
COUNTY OF BERNALILLO
471940S0511634
4P1BCAGF4JA018441
30914-1
471940S0517869
4P1BCAGF8JA018443
30947-1
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
ALLEGIANCE FIRE AND RESCUE
471940S0519709
4P1BCAGF2JA018504
30934-2
SOUTH ADAMS CO FPD
471940S0519737
4P1BAAGF4JA018543
31290-2
471940S0519740
4P1BAAGF6JA018494
31185-1
471940S0519743
4P1BAAGF8JA018545
31309-1
471940S0522847
4P1BAAGF2JA018539
31233-3
471940S0522859
4P1BAAGF2JA018542
31290-1
471940S0522862
4P1BCAGF0JA018503
30934-1
471940S0537039
4P1BAAGF9JA018716
31387-1
FRONT RANGE FIRE APPARATUS
LTD
FRONT RANGE FIRE APPARATUS
LTD
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
FRONT RANGE FIRE APPARATUS
LTD
ATLANTIC EMER. SOLUTIONS, INC MANASS
FRONT RANGE FIRE APPARATUS
LTD
FRONT RANGE FIRE APPARATUS
LTD
TEN-8 FIRE EQUIPMENT INC
471940S0538232
4P1BCAGF2JA018843
31715-1
CONRAD FIRE EQUIPMENT INC
CITY OF WICHITA
471940S0539144
4P1BCAGF0JA018761
31098-2
TOWN OF CASTLE ROCK
471940S0541384
4P1BCAGF9JA018760
31098-1
471940S0562415
4P1BAAGF5JA019152
31843-1
FRONT RANGE FIRE APPARATUS
LTD
FRONT RANGE FIRE APPARATUS
LTD
HUGHES FIRE EQUIPMENT INC
471940S0567610
4P1BAAGF6JA019130
31416-6
WASHINGTON DC FIRE & EMS
471940S0572069
4P1BAAGF6JA019256
31873-1
471940S0573251
4P1BCAGF0JA019151
31819-1
471940S0576059
4P1BAHGF9JA018658
31215-1
471940S0578542
4P1BAAGF3JA019313
31997-2
ATLANTIC EMER. SOLUTIONS, INC MANASS
ATLANTIC EMER. SOLUTIONS, INC MANASS
SCHUHMACHER FIRE EQUIPMENT
LLC
FRONT RANGE FIRE APPARATUS
LTD
HUGHES FIRE EQUIPMENT INC
471940S0580483
4P1BCAGF7JA019342
32005-1
471940S0580534
4P1BAAGF8JA019372
32008-1
SCHUHMACHER FIRE EQUIPMENT
LLC
HUGHES FIRE EQUIPMENT INC
ROCK COMMUNITY FIRE PROT
DIST
EAGLE FIRE DEPARTMENT
471940S0587998
4P1BAAGF4KA019466
32175-1
HUGHES FIRE EQUIPMENT INC
GILBERT TOWN OF
471940S0590790
4P1BCAGF8KA019495
32051-1
FAIRMOUNT FPD
471940S0592821
4P1BAAGF3KA019569
32321-1
FRONT RANGE FIRE APPARATUS
LTD
SUPERIOR EQUIPMENT
471940S0592848
4P1BAAGF4KA019547
32054-1
HUGHES FIRE EQUIPMENT INC
471940S0593664
4P1BAAGF3KA019572
32321-4
SUPERIOR EQUIPMENT
TUALATIN VALLEY FIRE &
RESCUE
SALT LAKE CITY CORPORATION
471940S0596260
4P1BAAGF8KA019647
32195-1
COUNTY OF LOUDOUN
471940S0600426
4P1BAAGF5KA019668
32220-1
471940S0600459
4P1BCAGF8KA019688
32237-1
471940S0604628
4P1BAAGF1KA019716
32246-1
471940S0606561
4P1BAAGF3KA019748
32331-1
471940S0606581
4P1BAAGF3KA019717
32246-2
471940S0608925
4P1BAAGF8KA019762
32375-1
471940S0608952
4P1BCAGF1KA019659
32412-1
ATLANTIC EMER. SOLUTIONS, INC MANASS
SCHUHMACHER FIRE EQUIPMENT
LLC
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
FRONT RANGE FIRE APPARATUS
LTD
FRONT RANGE FIRE APPARATUS
LTD
FRONT RANGE FIRE APPARATUS
LTD
FRONT RANGE FIRE APPARATUS
LTD
TEN-8 FIRE & SAFETY LLC
471940S0615048
4P1BAAGF2KA019868
32364-1
HUGHES FIRE EQUIPMENT INC
471940S0617055
4P1BAAGF1KA019845
32374-1
FRONT RANGE FIRE APPARATUS
LTD
THURSTON COUNTY FIRE DIST
NO 3
TOWN OF CASTLE ROCK
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DISTRICT 7 FIRE AND RESCUE
TOWN OF DERRY
CITY OF LITTLETON
PFLUGERVILLE TRAVIS COUNTY
ESD #2
WEST METRO FIRE RESCUE
PRINCE GEORGE COUNTY FIRE
& EMS DEPT
CITY OF LITTLETON
SOUTH ADAMS CO FPD
CITY OF TAMPA
TOWN OF CASTLE ROCK
CITY OF EUGENE
PRINCE GEORGE COUNTY FIRE
& EMS DEPT
CREVE COEUR FPD
EAGLE RIVER FPD
CITY OF BOISE
SALT LAKE CITY CORPORATION
METRO WEST FPD
CITY OF FARMINGTON
THORNTON CITY OF
FORT LUPTON FPD
THORNTON CITY OF
CITY OF LONGMONT
CITY OF LARGO
SERVICE BULLETIN #654
471940S0619129
4P1BAAGF3KA019846
32374-2
471940S0622943
4P1BCAGFXKA019983
32510-1
471940S0632499
4P1BAAGFXKA020038
32596-1
471940S0635694
4P1BAAGFXKA020198
32871-2
471940S0644613
4P1BAAGF2KA020163
32748-1
471940S0644617
4P1BAAGF8KA020197
32871-1
471940S0650659
4P1BAAGF2KA020289
32904-2
471940S0655986
4P1BAAGF2KA020373
32774-1
471940S0695102
4P1BCAGFXLA021010
33717-1
471940S0715365
4P1BAAGF1LA021175
33794-2
471940S0724538
4P1BAAGF7LA021214
33756-1
471940S0767811
4P1BAAGF6LA021933
34565-2
471940S0769267
4P1BAAGF2LA021699
33849-1
471940S0949681
4P1BCAGF4NA024262
36478-1
FRONT RANGE FIRE APPARATUS
LTD
COMMERCIAL EMERGENCY
EQUIPMENT
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
HUGHES FIRE EQUIPMENT INC
TOWN OF CASTLE ROCK
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
HUGHES FIRE EQUIPMENT INC
LAKE WORTH FIRE
DEPARTMENT
CITY OF HENDERSON
ATLANTIC EMER. SOLUTIONS, INC MANASS
HUGHES FIRE EQUIPMENT INC
ANNE ARUNDEL COUNTY FIRE
DEPARTMENT
GILBERT TOWN OF
FRONT RANGE FIRE APPARATUS
LTD
HUGHES FIRE EQUIPMENT INC
NORTH METRO FIRE RESCUE
DISTRICT
BILLINGS CITY OF
FRONT RANGE FIRE APPARATUS
LTD
SOUTH COAST FIRE EQUIP INC
SOUTH ADAMS COUNTY FIRE
PROTECTION DISTR
CITY OF GLENDALE
COMMERCIAL EMERGENCY
EQUIPMENT
SIDDONS-MARTIN EMERGENCY
GROUP, LLC
CITY OF MISSISSAUGA
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6
CITY OF MISSISSAUGA
CITY OF DENTON
CITY OF HENDERSON
OREM CITY OF