NHTSA ID Number: 10248700
Manufacturer Communication Number: SB_654
TSB/Document Date: 2024-01-13
Summary
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 software includes improvements for three fault codes.
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
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TSB/Document ID: SB_654
Replacement Service Bulletin Number:
MFR Communication Date: 2023-12-19
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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