8/31/2021

Article

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Selective Catalytic Reduction (SCR) Parts
Supersession; New Part Numbers For SCR
Muffler/Canister - All One Box And Two Box
Configurations EXCEPT Turbo Compound US17+OBD16 And US17+OBD18 Emissions, Model
Years 2018 And 2019

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Internal Content

THIS SOLUTION SHOULD ONLY BE UTILIZED AFTER RECEIVING
AUTRHORIZATION FROM DEALER TECHNICAL SUPPORT AS OUTLINED
IN SOLUTION K65527708.

Note: SCR part numbers do not change for Turbo Compound (TC)
applications.

Volvo Part Number 21970118 – This P/N has been replaced for all
applications except for Turbo Compound applications, replacement P/N
is 23189992.
Mack Part Number 21970120 – This P/N has been replaced for all
applications except for Turbo Compound applications, replacement P/N
is 23189994.

Copper (Old) Part Numbers
P/N
Description
Brand
22058301 SCR, VBOC Bottom Inlet Volvo
21970125 SCR, VBOC Side Inlet
Bus
22058302 SCR, VBOC Bottom Inlet Mack
22058306 SCR, VBOC Side Inlet
Mack

21970118 1-Box DPF + SCR

21970120 1-Box DPF + SCR

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Notes

Part number does not
Volvo change for Turbo Compound
vehicles!
Part number does not
Mack change for Turbo Compound
vehicles!

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Hybrid Part Numbers
P/N
23190004
23190006
23190005
23190007

Description
SCR, VBOC Bottom Inlet
SCR, VBOC Side Inlet
SCR, VBOC Bottom Inlet
SCR, VBOC Side Inlet

Brand
Volvo
Bus
Mack
Mack

23189992
23189994

1-Box DPF + SCR except TC
1-Box DPF + SCR except TC

Volvo
Mack

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Tags

k05618059

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Solution K65527708
Tuesday, August 31, 2021 6:56:38 PM CEST

** SOLUTION **
Title

Diagnostic Trouble Codes (DTC) P20EE And P103C, Diagnostic Procedure; REPLACES GUIDED DIAGNOSTICS IN PREMIUM TECH
TOOL ( PTT ) - US17+OBD16 Through US17+OBD2018 Emissions, Model Years 2018 And 2019

Mack Models
Mack Model

LR , MRU - TerraPro , TE - TerraPro , AN - Anthem , CHU - Pinnacle, Axle back , CXU - Pinnacle, Axle front , GR - Granite ,
GU - Granite , PI - Pinnacle

Volvo Models
Volvo Model

VNL , VNM , VNR , VAH , VHD

Emission Standard
Emission Standard

US17+OBD16 , US17+OBD18

Engine family
Engine family

11L Engine , 13L Engine , MP7 , MP8

** SOLUTION **
Cause
Solution

Procedures and checks to follow for P20EE and P103C on US17+OBD2016 and US17+OBD2018 chassis.

5 JANUARY 2020 UPDATE
There is no longer an eService case required for ANY STEP of
the process below. A case should ONLY BE OPENED if further
assistance is required to complete diagnosis.
If test results determine an SCR replacement is required, A
CASE IS NOT REQUIRED TO ORDER A REPLACEMENT.
Cases submitted solely to request approval to replace an SCR
WILL BE REFUSED.

PRIOR TO PROCEEDING
Review open campaigns for the vehicle and ensure that it is NOT listed for Recalls
EC0020a, EC0022a, EC0022b, or EC0022c.
IF THE CAMPAIGN APPLIES TO THE VEHICLE:
• No diagnostics are necessary.
• No eService case is necessary.
Follow the recall instructions if the vehicle is listed. This solution should only be
utilized if the vehicle is not included in any of the recalls.
CASES AND DIAGNOSTIC TIME REQUESTS OPENED FOR CHASSIS AFFECTED BY
ONE OF THE ABOVE RECALLS WILL BE REFUSED.

If this solution is being reviewed for P225E-00, solution
K15560422 must be utilized FIRST, and this solution should
only be followed if the NOx sensors are determined to be
functioning properly. The tests performed in K15560422 do
not need to be duplicated for this solution.

The following checklist should be used for diagnosis of P20EE or P103C on GHG17 chassis
instead of Guided Diagnostics.
DO NOT REPLACE ANY PARTS UNTIL ALL ACTIVITIES LISTED IN THIS CBR ARE COMPLETE.

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NOTE: The Malfunction Indicator Lamp ( MIL ) may still be lit even if P20EE shows inactive on a DTC Readout.

I. Vehicle Emissions Level
Review the vehicle emissions level
• Details can be found in the Product Details box on the Product tab in PTT as seen below:

• If the vehicle is US17+OBD16 or US17+OBD18:
- Perform Sections II and III below.

II. Vehicle History
- The following information should be obtained prior to beginning diagnosis.
• Is this the chassis's first visit to the dealer for either of these codes?
• Have there been any previous failures or problems that may have caused problems with the Exhaust Aftertreatment
System (EATS)?
○ Examples:
- Turbocharger failure
- EGR Cooler failure
- Coolant passage through the exhaust
- Excessive fuel through the exhaust (Injector failure, AHI failure)
- DPF failure
- Contaminated DEF

III. Check the DTC Readout
- Are there any other NOx sensor DTCs present?
• P225E and P0422 are very similar to P20EE and should be checked with the same steps below.
• Any other NOx sensor codes may suggest intermittent NOx sensor failure.
- Are there any codes present for other engine components that would indicate an issue contributing to or causing
either P20EE or P103C?
• Examples:
○ EGR System
○ Fuel System ( Includes AHI)
○ Turbocharger/Boost
○ DPF
○ Exhaust temperature

IV. Check SCR Efficiency Evaluations
- SCR Efficiency values can be found in Premium Tech Tool ( PTT ) Operation 2589-08-03-05 Aftertreatment
Selective Catalytic Reduction (SCR) System.

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• The last five efficiency evaluations are displayed as shown in the screenshot above.
○ If all five tests are below the fault limit, SCR conversion has been poor for an extended amount of time.
○ If only one or two are below the fault limit, conversion is only intermittently poor.
- Information on driving conditions when the poor conversion is occurring may provide insight into the cause of the
codes.

V. SCR System Checks
All steps below should be performed to verify proper function of each component.
1. Check DEF quality with a refractometer
2. Physically check for any contamination in the DEF tank
• Examples
- Dirt or Debris
- Coolant
- Water
- Fuel
- Oil
3. Physically inspect the DEF Dosing Valve, Diffuser Pipe, and SCR Inlet for crystallized DEF
• Ensure there is no significant/excessive crystal buildup in any component.
○ NOTE: A small amount of crystal accumulation is normal.
• If significant accumulation is noted clean it as first step and then ensure that the DEF dosing valve is correctly
installed with all gaskets and clamps positioned properly.
4. Perform DEF Dosing Test 2 to confirm proper function
• Located in Operation 2589-08-03-05 Aftertreatment Selective Catalytic Reduction (SCR) System.
○ Test B from the first screen of the operation
• Test two is the Small Dosing Test
○ The test should be run twice and results noted to an accuracy of 2 milliliters
○ Nominal Volume is 55 mL
- Acceptable range is 55 mL ± 3 mL
5. Check the Main Software part number for the Engine Control Module (EMS).
If vehicle has Turbo-compound system, then do not update EECU SW. Only EECU MSW 23470187 and older
have capability to run NOx conversion test on Turbo-compound vehicles.
If vehicle has VGT system, then update EECU MSW to 23766686 or newer.

6. If vehicle has a Turbo-compound System run NOx Conversion, Operation 2549-08-03-03. (only possible if
vehicle still has 23470187 and older EECU MSW).
7. If vehicle has a VGT System run Exhaust After-treatment System Analysis, Operation 2589-08-03-18. Make
sure to evaluate only NOx sensors and SCR using this test (See Picture Below).

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If NOx sensors have been recently evaluated to be good or replaced, Just selecting SCR efficiency is preferred.

Interpreting NOx Sensor Test Results:
When NOx Sensors portion of the test is completed look for results on right hand side as shown in picture below.

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Average difference Low more than 75 ppm suggests one sensor not acceptable (Currently we may fail at difference
>50ppm). If results for low level (circled above) is between 50-75 ppm, sensors are OK. Re do the 2589-08-0318, while selecting only SCR efficiency.
If results for low level is greater than 75 ppm, look and see if there are any other NOx sensor fault codes
suggesting a sensor to be damaged. If no other codes, we would recommend replacing the sensor reading higher
values in the test (Egs: In the example above NOx Inlet sensor would be suspected to be failed, as Average Inlet is
higher than Average Outlet).

Interpreting SCR Efficiency Results:
Expected Efficiency by Step 2 is more than 83% for Good SCR. If Step 1 gets more than 85% efficiency Step 2 is
skipped (Fast Pass).
Maximum Efficiency out of Step1 and Step 2 below 77% is considered degraded SCR and SCR can be replaced.
Maximum efficiency out of Step 1 and Step 2 above 83% is considered Good SCR and should not be replaced.
Maximum Efficiency out of Step 1 and Step 2 between (77-83)% is considered marginal SCR, replacement can be
done based onother considerations (Repeat visit, any derates etc).

VI. eService Case
If further assistance is required to complete diagnosis and an eService case is opened, the case MUST INCLUDE:
1. The vehicle history as described in Section I.
2. A complete DTC Readout from the time of the vehicle's arrival.
3. Screenshots of:

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• SCR Efficiency values as shown in Section III
• The NOx Conversion Test as shown in the picture in Section IV.
NOTE: Refer to CBR Solution K52225504 - Methods For Taking A Screenshot

4. A description of findings for each item checked in Section IV, including numerical values for the dosing tests ("Good",
"Okay", "In spec", etc. are not acceptable values).

Internal comments

For OBD2019 and Newer vehicles (Truck MY2020+), there is a new CBR.

(BO)
GHG2017 and OBD2018 vehicles have Exhaust Aftertreatment System Analysis Test (2589-08-03-18), which helps evaluate NOx
sensors, DEF dosing valve and SCR in one ~30 minute test with wk1945+ EECU MSW (P/N 2376686 or newer) releases.
We do not have capability to run either NOx conversion or EATS Diagnostics Test (2589-08-03-18) on Turbocompound Vehicles.
Solution visibility

Dealer distribution

Function(s)/component(s) affected
Function affected

Diagnostic tool , DEF Dosing , SCR

Function Group
Function Group

254 catalytic converter; exhaust emission control equipment , 258 emissions after-treatment

Customer effect
Main customer effect

regeneration , diagnostics/methodology , efficiency/abnormal behavior , fault code/display

Fluid implicated

Diesel Exhaust Fluid (DEF)

Fault Codes And Error Codes
OBDII Diagnostic
Trouble Codes (P, U, B

P0422-00 , P103C-00 , P20EE-00 , P225E-00

Format)

Conditions
Vehicle operating
mode
Frequency of
occurrence of problem

when driving , when stationary

random

Administration
Author

UT0031H

Dealer ID

UT0031H

Last modified by

A241298

Creation date

05-06-2018 17:06

Date of last update

14-05-2020 19:05

Review date

01-10-2018 00:10

Status

Published

Average score

4

Number of scores

5

NA_Reviewer

ut0031h

NA_Author_Group

GTT

UNCONTROLLED COPY. Printed document is for temporary use only and should not be retained.

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