KC-450

1/31/22, 4:00 PM
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Diagnostic Trouble Codes ( DTC ) P20EE, P207F And
P103C, Diagnostic Procedure - REPLACES GUIDED
DIAGNOSTICS IN PREMIUM TECH TOOL ( PTT )
- US10+OBD2013 to US14+OBD2016 (Non-Common
Rail) Emissions, Commonly Model Years 2014 To
2017
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Internal Content
IMPORTANT
An eService case IS NOT 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.
The following checklist should be used for diagnosis of
P20EE, P207F or P103C on US10+OBD13 to US14+OBD16
chassis instead of Guided Diagnostics.
DO NOT REPLACE ANY PARTS UNTIL ALL ACTIVITIES LISTED IN THIS
SOLUTION ARE COMPLETE.
NOTE: The Malfunction Indicator Lamp ( MIL ) may still be lit even if
P20EE shows inactive on a DTC Readout.
I. Vehicle History
- The following information should be obtained and reviewed 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)?
; Live UI ○ Examples:
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- Turbocharger failure
- EGR Cooler failure
- Coolant passage through the exhaust
- Excessive fuel through the exhaust (Injector failure, AHI failure)
- DPF failure
- Contaminated DEF
NOTE: If this is the chassis's first visit for any of the three codes, a
Crystal Sublimation should be performed and the chassis released
after confirming the items below.
II. Check the DTC Readout
- A complete DTC Readout from the time of the vehicle's arrival
should be attached to the eService case if one must be opened as
outlined in Step V.
- Are there any other NOx sensor DTCs present?
• P225E and P0422 are very similar to P20EE. The checks below should
be followed for these codes as well.
• 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,
P207F or P103C?
• Examples:
○ EGR System
○ Fuel System ( Includes AHI)
○ Turbocharger/Boost
○ DPF
○ Exhaust temperature
III. Check SCR Efficiency Evaluations
- SCR Efficiency values can be found in Premium Tech Tool ( PTT )
;
Live
UI
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.
○ Note: US10+OBD13 vehicles will only display one previous
evaluation. A screenshot should still be provided if an eService
case is opened.
○ 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.
IV. SCR System Checks
- Check DEF quality with a refractometer
- Physically check for any contamination in the DEF tank
• Examples
- Dirt or Debris
- Coolant
- Water
- Fuel
- Oil
; Live UI
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- 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.
- Perform DEF Dosing Test 2 (confirms correct operation of the DEF
dosing valve)
• 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
- Run a NOx Conversion, Operation 2549-08-03-03.
• Note: This test checks the function of both NOx sensors. It does not
evaluate SCR efficiency.
• While running the routine if you get new NOx sensor fault code (Egs:
P220E-93 , P220F-93), then troubleshoot that fault code. Typically
P220E-93 fault code suggests replacement of NOx1 sensor.
• Inlet and Outlet NOx Sensor values should be close to each other at
high engine speed (last portion of the test) as shown below.
; Live UI
If during the test difference between NOx sensors are greater than
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10%, we recommend replacing sensor reading higher value and re-do
the test.
The likelihood that both sensors require replacement at once is low.
Replacement of both sensors at once should not be considered
immediately unless affected by an upstream failure.
V. If no fault is found and an eService is required for further
assistance, the following items MUST BE included when the case is
opened:
- A thorough description of vehicle history
• Summary of previous visits to service locations
• Previous repairs and part replacements and findings that led to
the repair or replacement
- A complete list of all diagnostic steps performed including actual
numerical values observed in the steps above.
• "Performed GD", "Completed worksheet", "Completed solution" etc.
do not provide any information on work that has already been done.
• "Good", "OK", "in spec", are not acceptable values. Numerical values
are required.
• CBR solution numbers should be included.
- A complete DTC Readout from the time of the vehicle's arrival.
- A screenshot of SCR efficiency evaluations as shown in Section III.
UI
; Live
- A screenshot of the NOx Conversion test as shown in Section
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p20ee-00
p207f00
p0422-00
p225e-00
p20ee00
p103c-00
p042200
p225e00
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