NHTSA ID Number: 10216860
Manufacturer Communication Number: KC-2158
TSB/Document Date: 2022-08-02
Summary
Mack
Selective Catalytic Reduction (SCR) Muffler Troubleshoot...
6/30/22, 12:34 PM
Article
Selective Catalytic Reduction (SCR) Muffler
Troubleshooting Guide - US10+OBD13 And Newer
Emissions
Component Overview
The SCR contains a coated substrate that, with the input of heat and DEF,
changes NOx into nitrogen and water vapor. The SCR's job in the Emissions
After-Treatment System (EATS) is to lower the NOx level emitted into the
atmosphere.
The performance of the SCR is evaluated by the NOx sensors. There are
NOx sensors that are located on upstream (inlet) and downstream (outlet)
ends of the SCR.
Important: the SCR is the last component in the EATS which makes
it susceptible to any upstream failures.
Primary failure mode of the Muffler (SCR) is:
Coating of the substrate being compromised
Indigestions of foreign objects such as oil, coolant, fuel, etc.
Diagnosis and Repair
Prior to proceeding with any of the information below, any codes,
symptoms or failures of upstream components must be diagnosed and
corrected first.
Upstream components include:
Base Engine (Starting or operation issues)
EGR System
Fuel System (Engine supply and aftertreatment hydrocarbon injector
supply)
Turbocharger/Boost
Diesel Oxidation Catalyst (DOC)
Diesel Particulate Filter (DPF)
Aftertreatment sensors (Exhaust temperature)
; Live UI
The three DTCs below indicate problems with SCR function. These DTCs
h ld l b di
d if h
i
if h DTC C fi
d
i
https://volvo-trkna-prod1.pegacloud.net/prweb/PRAuth/app/VolvoKM_/iNPUIKpeinqPJi2G0hH930k43USdE1gb*/!TABTHREAD9?pyActivity=%40basec…
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should only be diagnosed if they are active or if the DTC Confirmed status is
True in the Detailed status information section.
Fault
Code
Descriptions
P20EE
SCR NOx Catalyst Efficiency Below Threshold (Bank 1)
P103C
NOx Catalyst Efficiency Inducement, Selective Catalytic
Reduction (SCR) Unit
P207F
SCR NOx Catalyst Efficiency Below Threshold (Bank 1)
Evaluations for SCR Muffler Replacement
The following systems need to be evaluated in progressive order to
determine the state of the SCR.
1. DEF System - Test the Urea/DEF Systems functionality for proper:
Quality
Check DEF Quality using Refractometer (88890105)
Litmus Test paper (88890110)
Quantity
SCR Dosing Test in PTT, Operation 2589-08-03-05
subsection 1-3.
With the dosing nozzle removed, inspect for crystal build up.
If any of the above tests fail: Correct the issue, clear fault codes, and
release the truck.
2. NOx Sensor Condition - Evaluate the condition of both NOx
Sensors.
Look for the following:
Non-OEM (3rd party) sensors, use CBR-2114 for guidance.
Any/All NOx sensor fault codes. See CBR-2116 for a list of
these faults and recommendations.
If Non-OEM or faulty Nox Sensor(s) is found: Replace the sensor(s),
clear faults and release the truck.
3. NOx Sensor Function and SCR Assessment- Evaluate NOx sensor
function using the appropriate test for the vehicle's emission level,
indicated below. Follow the directions in the Action column for Nox or
UI
; Live
SCR Replacements.
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Emission
Article
PTT Operation
Action
OBD 13-16
2549-08-03-03 Nox
Conversion Test
Follow test recommendation, if no
fault found replace the SCR in
accordance with Impact
procedures.
OBD 17-18
VGT Only
2589-08-03-18
Exhaust
Aftertreatment
System Analysts
(make sure Nox and
SCR Subtest are
selected)
Follow test recommendation and
release truck.
OBD 17-18
TC Only
No test…
Replace Both Nox Sensors if not
replaced within past 3 months
and release truck. If truck has
received both Nox sensors within
past 3 months replace the SCR in
accordance to impact
procedures.
Level
OBD 19 and 2549-08-03-03 Nox
Newer VGT Conversion Test
Only
OR (whichever is
available)
Follow test recommendation, if no
fault found replace the SCR in
accordance to Impact procedure.
2589-08-03-18
Exhaust
Aftertreatment
System Analysts
(only Nox Subtest
available)
OBD 19 and 2549-08-03-03 Nox
Newer TC
Conversion Test
Only
Follow test recommendation, if no
fault found replace the SCR in
accordance to Impact
procedures.
Rules for Replacement
Standard Diagnostic time is 3 hours.
Note that Warranty will only cover replacement of the SCR if one of the
;
three
Live
UIcodes in the section above is present. If the SCR is suspected to
have failed due to upstream contamination with no codes present, an
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eService case is required for further evaluation.
Review the applicable video link below.
SCR MUFFLER
SCR MUFFLER
Tags
p103c00
p207f00
p20ee00
unlocking uptime
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scr
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Non-OEM (3rd Party) NOx Sensor Identification
Internal Content
If one or more of the codes below are present it is recommended to
inspect for 3rd party NOx sensors.
P103C-00
P207F-00
P026D-00
3rd party NOx sensors have been found to induce erroneous faults
and cause various system failures. If 3rd party NOx sensors are found
they should be removed and replaced with a genuine OEM sensor.
Clear faults and verify the repair.
Use the below information to identify 3rd
party NOx sensors.
How To Verify An OEM Sensor
For Trucks MY 2017 and newer products run Premium Tech Tool Test 170008-03-06 Sensor and Parameter Values. All genuine OEM NOx
sensors will display the expected values as seen below. All other
values are components from a 3rd party.
Expected Values
NOx1
791293237
NOx2
541003308
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Refer to the illustrations below to help identify 3rd party
NOx sensor.
OEM sensor with markings and part number for reference
3rd party NOx Sensor in bag
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3rd party sensors with and with out markings
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OEM sensor tip design for
reference
Article
3rd party sensor with
incorrect sensor tip
The table below illustrates how difficult it can be
to identify 3rd party sensors when compared to
an OEM sensor
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Sticker says “Warranty void”
Marking text: “PreSCR”
Marking text: “CONTINENT AL”
Marking text font: different from
Volvo part
Article
No such sticker
Marking text: “Pre SCR”
Marking text: “CONTINENTAL”
Conclusion: The sensor on the left is not a Genuine Volvo
NOx Sensor
; Live UI
Tags
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Article
Tags
3rd party nox sensor
volvo
p103c
p207f
p026d
spn 1231 fmi 2
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TSB/Document ID: KC-2158
Replacement Service Bulletin Number:
MFR Communication Date: 2022-07-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
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