Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset with fault code P13DF00 or P300685
Topic number

LI49.20-N-075995

Version

5

Function group

49.20 - Exhaust gas aftertreatment

Date

1/15/26

Validity

Model 907 with code KP7 (Generation 4 SCR exhaust
gas cleaning)

Reason for change

Remedy Update

Complaint
Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset.
Information: All fault codes in the AdBlue® (SCR) control unit have been processed and corrected; however, fault
codes P13DF00 and P300685 remain active and stored in the AdBlue® (SCR) control unit.

Cause
The procedure for resetting the SCR/AdBlue® warning message with XENTRY Diagnosis has not been carried out.
Information: Before resetting the SCR/AdBlue® warning message for SCR Generation 4, the AdBlue® system must
be in proper working condition and tested.

Remedy
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Note: Do not replace any parts
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1. Connect the Battery Charger
•
Refer to manual AR54.10-D-1127TS for detailed instructions specific to Model 907.
Note: Maintaining an adequate voltage from the onboard electrical system battery is crucial throughout the entire work
procedure. Insufficient voltage can damage the control units.
Important: Follow the operating instructions for the charger meticulously.
Important: Ensure the charger sustains a minimum voltage of 12.5V from the onboard electrical system battery at all
times.
2. Connect the Diagnostic Device

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•

Refer to manual AD00.00-D-2000-06TS for detailed instructions on connecting the diagnostic device for Model
907.
Important: Adhere strictly to the operational steps outlined in the XENTRY Diagnosis.
Note: Utilize XENTRY Diagnosis version 09/2025 with Add-on 32891 or 12/2025 with Add-on 32890 or later. Verify
that you have the latest version and add-ons, as updates are regular.
3. Reset the SCR/AdBlue® Warning Message using XENTRY Diagnosis
•
•

Navigate through the menu items as follows:
Quick test view → N118/5 – Selective Catalytic Reduction (SCR GEN4) → Special processes → Reset SCR/AdBlue® warning message.
Note: Ensure all 5 listed processes are completed successfully, indicated by Actual value: "successfully completed".
4. Complete the Disconnect and Sleep Mode Initiation Procedure
•
•
•
•
•
•
•

Disconnect XENTRY.
Refer to manual AD00.00-D-2000-06TS for the correct procedure to disconnect the diagnostic device from Model 907.
Disconnect the Battery Charger
Refer to manual AR54.10-D-1127TS for instructions on safely disconnecting the battery charger from Model
907.
Turn off the ignition.
Remove the key.
Lock the vehicle and wait approximately 15 minutes to allow the CAN bus system to enter sleep mode.

5. Post-Sleep Mode Vehicle Start
•
After the 15-minute waiting period, start the vehicle.
Note: The "starts remaining" message will remain on the Instrument Cluster (IC), but the vehicle will not be in the
5mph derate mode.
6. Drive for System Self-Test
•

Drive the vehicle for 5-10 miles to enable the SCR system to perform a self-test and potentially resolve fault
codes.

7. Confirm and Erase Fault Codes
•
•
•

Verify that the "starts remaining" message disappears from the IC.
Ensure all relevant fault codes are stored.
Erase the fault memory if necessary.

8. Disconnect the Diagnostic Device
•

Refer to manual AD00.00-D-2000-06TS for the correct procedure to disconnect the diagnostic device from Model 907.

9. Disconnect the Battery Charger
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•

Refer to manual AR54.10-D-1127TS for instructions on safely disconnecting the battery charger from Model
907.
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Note: It is not permitted to replace parts or to invoice for material or wage costs under the warranty or goodwill in connection with an incorrectly executed reset of the SCR/AdBlue® warning message with XENTRY Diagnosis.
***********************************************************************************************************************

Attachments
File

Description

SCR reset test plan.mp4

SCR reset test plan

WIS-References
Document number

Title

Note

AD00.00-D-2000-06TS

Connect/disconnect diagnostic device Model 907

AR54.10-D-1127TS

Maintain on-board electrical system
Model 907
voltage for testing and diagnosis work
on the vehicle

Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.

Symptoms
Power generation > Engine management > Indicator lamp > Engine diagnosis > lit
Communication/information > Information display > Indicator lamp > lit
Power generation > Exhaust system > AdBlue > AdBlue consumption > Too high
Power generation > Exhaust system > AdBlue > AdBlue consumption > Too low
Power generation > Engine management > Function > Malfunction

Control unit/fault code
Control unit

Fault text

N118/5 | N141 - Selective catalytic reduction (SCR
GEN4) (UDCM2)

P13DF00 - The AdBlue® system has a malfunction. _

Operation numbers/damage codes
Op. no.

Operation text

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Damage
code

Note

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541011

Perform quick test

540650

Maintain on-board electrical system vol- H
tage (for testing and diagnosis work)

470642

CHECK ADBLUE(R) SYSTEM (AFTER H
QUICK TEST)

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