NHTSA ID Number: 10136558
Manufacturer Communication Number: TSB180047-041320
TSB/Document Date: 2018-05-14
Summary
This Technical Service Bulletin describes the verfication and resolution of Diesel exhaust fluid (DEF) dosing unit heater elements becoming discolored caused by chemical reactions between DEF and the aluminum housing. Also the DEF dosing valve inlet screen can become plugged with debris when corrosion on the DEF dosing unit heating element flakes off typically leading to FC1682, FC3574, and/or FC3596.
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TSB/Document ID: TSB180047-041320
Replacement Service Bulletin Number:
MFR Communication Date: 2018-04-18
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
MFR Component System:
MFR Component Subsystem:
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Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 1 of 9
Technical Service Bulletin
Technical Service Bulletin:
Released Date: 18-Apr-2018
TSB180047
Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element
Discoloration
Aftertreatnent Diesel Exhaust Fluid Dosing Unit
Heating Element Discoloration
Warranty Statement
The information in this document has no effect on present warranty coverage or repair
practices, nor does it authorize TRP or Campaign actions.
Contents
Product Affected
•
•
•
•
•
•
•
•
B6.7 CM2350 B121B
L9
CM2350 L116B
X12 CM2350 X119B
X15 CM2350 X114B
X15 CM2350 X116B
QSK19 CM2350 K105
QSK50 CM2350 K108
QSK95 CM2350 K113
Issue
Symptom:
• Diesel exhaust fluid (DEF) dosing unit heater elements can be discolored caused by
chemical reactions between aluminum housing and DEF.
• DEF dosing valve inlet screen can become plugged with debris when corrosion on
the DEF dosing unit heating element flakes off.
• A plugged DEF dosing valve inlet screen will typically lead to FC1682, FC3574,
and/or FC3596.
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Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
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Note : Additional DEF system related fault codes can be present.
Verification/Confirmation
Verify symptoms and/or listed Fault Codes are present.
Resolution
If DEF dosing valve inlet screen is found to be plugged with debris, and corrosion on
DEF dosing unit heating element is flaking off:
• DEF dosing unit and DEF dosing valve inlet screen must be replaced. DEF pressure
line, between DEF dosing unit and DEF dosing valve must be flushed with distilled
water to remove any residual debris.
• See Figure 1 for an example of a plugged DEF dosing valve inlet screen.
• See Figure 2 for an example of a DEF dosing unit heating element with corrosion
that is flaking off.
If DEF dosing valve inlet screen is not plugged with debris and there is corrosion on DEF
dosing unit heating element, but is not flaking off:
• Do not replace DEF dosing unit (for this condition). All DEF dosing units will have
some level of discoloration/corrosion internally.
• See Figure 3 for an example of a clean DEF dosing valve inlet screen.
• See Figures 4, 5, and 6 for examples of DEF dosing units with acceptable levels of
discoloration/corrosion.
Note : If DEF dosing valve inlet screen was removed from DEF dosing valve
during inspection, DEF dosing valve inlet screen must be replaced.
Part Identification
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Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
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Figure 1, Plugged DEF Dosing Valve Inlet Screen.
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Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
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Figure 2, Corroded DEF Dosing Unit Heating Element
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Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
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Figure 3, Normal DEF Dosing Valve Inlet Screen.
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Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
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Figure 4, Normal DEF Dosing Unit Heating Element Discoloration.
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Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
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Figure 5, Normal DEF Dosing Unit Heating Element Discoloration.
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Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
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Figure 6, Normal DEF Dosing Unit Heating Element Discoloration.
Affected UL2 DEF dosing unit parts numbers can be seen in Table 1:
Table 1: Affected DEF dosing unit part numbers
CES Part Number
EBU Part Number
A052Y605
4388105
A051F964
4377994
A047H782
4353810
A050G798
4377364
A055B124
5373865
A055B125
5373866
A057Y382
5375478
A057Y387
5375479
A057Y445
5375480
A057Y212
5375481
A057Y215
5375482
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Aftertreatnent Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
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Document History
Date
2018-4-13
Details
Module Created
Last Modified: 18-Apr-2018
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4/19/2018
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