K58203603
Service Bulletin Details
Public Details for: K58203603
Diagnostic trouble code (dtc) P20EE - scr nox catalyst efficiency below threshold (bank 1) - us17+obd2019 emissions, model year 2020 only
- 2020 -
Models from 2020
2020 VOLVO VAH |
2020 VOLVO VHD |
2020 VOLVO VN |
2020 VOLVO VNL |
2020 VOLVO VNR |
2020 VOLVO VNX |
Solution K58203603 Wednesday, December 4, 2019 9:42:22 PM CET ** SOLUTION ** Title Diagnostic Trouble Code (DTC) P20EE - SCR NOx Catalyst Efficiency Below Threshold (Bank 1) - US17+OBD2019 Emissions, Model Year 2020 ONLY Mack Models Mack Model AN - Anthem , CHU - Pinnacle, Axle back , CXU - Pinnacle, Axle front , GR - Granite , GU - Granite , PI - Pinnacle Volvo Models Volvo Model VN , VNL , VNR , VNX , VAH , VHD Emission Standard Emission Standard US17+OBD19 Engine family Engine family 11L Engine , 13L Engine , MP7 , MP8 ** SOLUTION ** Cause Trucks built for emissions level US17+OBD19 (Model year 2020) and equipped with a one-box exhaust aftertreatment system (DPF, DOC and SCR are contained in one unit) have shown a higher than normal occurrence of fault code P20EE logged in the field. Affected vehicles have been observed having large urea crystal buildup starting from the DEF dosing valve. When applicable SCR mufflers are evaluated following removal of the DEF crystals, the SCR functions as good as a new component. Solution Return Visit If the vehicle has been in for this issue previously an eService case should be started for further assistance AFTER verifying that the same problem exists. The eService case MUST INCLUDE: • The CBR Diagnostic Session number or this Solution number. • A thorough description of the problem. • The vehicles previous history and what was done to resolve the issue on previous visits (This solution MUST have been performed previously if a case is being opened!). • A complete DTC readout from the time of the vehicle's arrival. First Visit 1. Verify the chassis emissions level and ensure that the vehicle is within the applicable range for this solution. Details can be found in the Product Details box on the Product tab in PTT as seen below: 2. Remove the DEF dosing valve and inspect for crystal buildup. An example of expected crystal buildup can be seen below: 2.1. If crystal buildup is similar to that shown in the picture above: Continue to Step 3. 2.2 If there are no crystals present, or the crystal accumulation is light with small crystals: Proceed to and complete solution K65527708. 3. Remove the DPF (Tear Drop) cover and clean the crystal accumulation out of the pipes. 3.1. With a damp cloth, wipe off the DEF dosing valve and mixing vanes. 4. Once the inside of the muffler is clean, Install new gaskets and V-clamps clamps for the tear drop cover. 5. Re-install the cover. 6. Remove and discard the insulator (gasket) from the dosing valve. The part is highlighted in the picture below. 7. Re-install the DEF dosing valve WITHOUT a new insulator. Make sure to use a new sealing plate and new mounting screws (one time use parts). 8. Clear fault codes. 9. Perform a Sulfur Regeneration. This will complete the cleaning of the SCR. 10. Release the vehicle. This is a temporary containment for this issue. This solution will be updated when more information is available. Internal comments (FO) This is a containment. If a truck has P20EE without urea crystals or if a truck returns with crystallization even after containment please contact Nataraj Bhat/ John Whelan for additional analysis. Temporary solution Temporary solution Solution visibility Dealer distribution Function(s)/component(s) affected Function affected SCR , DEF Dosing Function Group Function Group 254 catalytic converter; exhaust emission control equipment , 2584 Dosage Valve; Injector Customer effect Main customer effect regeneration , fault code/display Fluid implicated Diesel Exhaust Fluid (DEF) Fault Codes And Error Codes OBDII Diagnostic Trouble Codes (P, U, B Format) P0422-00 , P103C-00 , P20EE-00 , P225C-00 Administration Author UT0031H Dealer ID UT0031H Last modified by RU4469V Creation date 16-10-2019 19:10 Date of last update 13-11-2019 20:11 Review date 16-12-2019 00:12 Status Published NA_Reviewer UT0031H UNCONTROLLED COPY. Printed document is for temporary use only and should not be retained.