KC-2158
Service Bulletin Details
Public Details for: KC-2158
Selective catalytic reduction (scr) muffler troubleshooting guide - us10+obd13 and newer emissions
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6/1/22, 3:22 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
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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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Article
eService case is required for further evaluation.
Review the video link below.
SCR MUFFLER
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p103c00
p207f00
volvo
p20ee00
unlocking uptime
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Article
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
; Live UI
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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
; Live UI
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3rd party sensors with and with out markings
; Live UI
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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
; Live UI
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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
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Tags
3rd party nox sensor
volvo
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p103c
p207f
p026d
spn 1231 fmi 2
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Article
NOx Sensor Troubleshooting Guide - US10+OBD13
And Newer Emissions
Component Overview
There are two Nitrogen Oxide (NOx) sensors in the Exhaust Aftertreatment
System, an INLET and OUTLET. They are smart sensors reporting on the
DL7 (J1939-7) data link and they measure the INLET (Pre SCR) and
OUTLET (Post SCR) of NOx. The NOx sensors have unique CAN
identification numbers and cannot be swapped. Additionally these sensors
are not operational until the exhaust is up to operating temperature and free
of moisture. The Engine Control Module compares the INLET and OUTLET
NOx readings to evaluate the efficiency of the SCR.
The primary failure mode the NOx Sensors is internal failure, which will
generate a sensor specific fault code.
Diagnosis and Repair
Review the tables below to determine which category the Fault Code
currently being diagnosed falls under. Proceed according to the instructions
for the appropriate section.
INLET NOx Sensor (NOx 1) Diagnostic Trouble Codes - Sensor Failure
REPLACE the sensor if any codes in red below are active and/or
confirmed. Do not replace for inactive codes.
Fault
Code
Fault Description
NOx Sensor Performance - Sensing Element Bank 1 Sensor 1,
Performance or Incorrect Operation
NOx Sensor Heater Control Circuit Range/Performance (Bank 1
P220E-93
Sensor 1), No operation
P22FB-92
P2200-13
P2203-00
P2205-13
P2206-00
NOx Sensor Bank 1 Sensor 1, Circuit Open
NOx Sensor Circuit High Bank 1 Sensor 1
NOx Sensor Gas Outlet Open Circuit, Circuit open
NOx sensor heater control circuit low, bank 1 sensor 1
P2208-00
NOx sensor heater sense circuit, bank 1 sensor 1
; Live UI
Direction/Repair: Replace the sensor in accordance with Impact
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instructions.
Do NOT Cut the sensor wiring harness, all NOX sensors are currently on
mandatory return.
Inlet NOx Sensor (NOx 1) Diagnostic Trouble Codes - Potential Sensor
Failure
These codes in yellow below indicate that the inlet NOx sensor is potentially
damaged, but further investigation is required to verify sensor condition.
Fault Code
Fault Description
P026C-00
Fuel Injection Quantity Lower Than Expected
P026D-00
Fuel Injection Quantity Higher Than Expected
P2201-64
NOx Sensor Bank 1 Sensor 1, Signal plausibility failure
P225C-00 NOx Sensor Performance - Signal Stuck High Bank 1 Sensor 1
Direction: Run the applicable PTT Operation per OBD Level.
Emission
Level
OBD 1316
OBD 1718 VGT
Only
OBD 1718 TC
Only
PTT Operation
2549-08-03-03 Nox Conversion Test
2589-08-03-18 Exhaust Aftertreatment System Analysts (make
sure Nox Subtest is selected)
No test… Replace INLET (Nox 1) Nox Sensors if not replaced
within past 3 months and release truck. If Nox sensor has been
replaced within past 3 months open an E-Service Case.
2549-08-03-03 Nox Conversion Test
OBD 19
and
OR (whichever is available)
Newer VGT
Only
2589-08-03-18 Exhaust Aftertreatment System Analysts (only
Nox Subtest available)
OBD 19
and
2549-08-03-03 Nox Conversion Test
Newer TC
Only
; Live UI
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Repair:
• If the INLET (NOx1) sensor fails the evaluation, replace the Inlet NOx
Sensor ONLY.
• If the NOx2 sensor (Outlet NOx Sensor) fails the test, disregard the
results.
OUTLET NOx Sensor (NOx 2) Diagnostic Trouble Codes Sensor Failure
REPLACE the sensor if any codes in red table below are active and/or
confirmed. Do not replace for inactive codes.
Fault Code
Fault Description
P220F-93
NOx Sensor Incorrect Value at Startup, No operation
P229E-13
NOx Sensor Bank 1 Sensor 2, Circuit open
P22A6-00
NOx sensor heater sense circuit, bank 1 sensor 2
P22A1-00
NOx Sensor Circuit High Bank 1 Sensor 2
P22A3-13
NOx Sensor Heater Control Bank 1 Sensor 2, Circuit open
P22A4-00
NOx sensor heater control circuit low, bank 1 sensor 2
P22FE-00 NOx Sensor Performance - Sensing Element Bank 1 Sensor 2
Direction/Repair: Replace the sensor in accordance with Impact instructions.
Do NOT Cut the sensor wiring harness, all NOX sensors are currently on
mandatory return.
Outlet NOx Sensor (NOx 2) Diagnostic Trouble Codes Potential Sensor Failure
Fault Code
Fault Description
P225E-00 NOx Sensor Performance - Signal Stuck High Bank 1 Sensor 2
Direction: Run the applicable PTT Operation per OBD Level.
Emission
PTT Operation
Level
OBD 132549-08-03-03 NOx Conversion Test
16
OBD 172589-08-03-18 Exhaust Aftertreatment System Analysts (make
18 VGT
sure NOx and SCR Subtest are selected)
Only
OBD 17- No test… Replace Outlet (NOx 2) NOx Sensors if not replaced
UI
; Live18
TC
within past 3 months and release truck. If NOx sensor has been
Only
replaced within past 3 months open an E-Service Case
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Only
Article
replaced within past 3 months open an E-Service Case.
OBD 19
and
Newer VGT
Only
2549-08-03-03 NOx Conversion Test
OR (whichever is available)
2589-08-03-18 Exhaust Aftertreatment System Analysts (only
Nox Subtest available)
OBD 19
and
Newer TC
Only
2549-08-03-03 NOx Conversion Test
Repair:
• If the Outlet (NOx 2) sensor fails the evaluation, replace the Outlet NOx
Sensor ONLY.
• If the NOx 1 sensor (Inlet NOx Sensor) fails the test, disregard the
results.
Diagnostic Trouble Codes With NOx Sensor in the Description
Direction/Repair: DO NOT REPLACE the NOx sensor(s) for these codes.
Diagnostics should be performed using PTT Diagnostics and the comment
section in the table below.
Fault
Code
P220A-1C
P220B-1C
Fault Description
Comments
NOx Sensor Supply Voltage Circuit (Bank 1
Sensor 1), Circuit voltage out of range
NOx Sensor Gas Outlet High Voltage, Circuit
voltage out of range
Power
supply
Power
supply
Sensor
reading fresh
air
Sensor
reading fresh
air
P225D-00
NOx Sensor Performance - Signal Stuck Low
Bank 1 Sensor 1
P225F-00
NOx Sensor Performance - Signal Stuck Low
Bank 1 Sensor 2
U029D-00
Lost Communication With NOx Sensor "A"
UI
U029E-00
; Live
Lost Communication with NOx Sensor B
Most likely
Harness
Issue
Most likely
Harness
Issue
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P229F-64
Article
NOx Sensor Gas Outlet Removed, Signal
Nuisance
plausibility failure
code, most
likely
“Confirmed =
False”
Although the codes above have the term "NOx sensor" in their descriptions,
it is highly unlikely that the sensor is the cause of any of these codes. The
table above specifies the likely cause of each code.
Rules for Replacement
Warranty will only cover replacement of the NOx Sensors if one of the codes
in Red or Yellow listed above is active or confirmed. If the NOx Sensor is
suspected to have failed with no active or confirmed codes, an eService
case is required for further evaluation.
Review the video link below.
NOx Sensor
Standard Diagnostic Time for a NOx Sensor is 1.0 hr.
;
Tags
p2200-13
p2203-00
p2205-13
p2206-00
p2208-00
p026c-00
p026d-00
p2201-64
p225c-00
p220f-93
p229e-13
p220a-1c
p220b-1c
p225d-00
p225f-00
u029d-00
u029e-00
p229f-64
p22fb-92
p220e-93
p22a6-00
p22a1-00
p22a3-13
p22a4-00
p225e-00
p20ee-00
p103c-00
Live UI
p22fe-00
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p207f-00
Article
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