2021 Mercedes-Benz Sprinter 3500 Technical Service Bulletins

127 technical service bulletins (TSBs) are on record for the 2021 Mercedes-Benz Sprinter 3500. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 11038169Sep 29, 2026Brakes. Brakes may lock up when reversing at slow speeds Complaint When reversing slowly, the vehicle erroneously triggers an emergency braking event, causing the brakes to lock up. Engine may not start following a key cycle. Cause The vehicle triggers a maneuvering or emergency braking event while reversing. The customer must then immediately park the vehicle (ignition Switched OFF) The hydraulic pressure release process…
• 11038718Sep 26, 2026Other or unknown. Fuel Level Unchanged After Refueling Complaint The customer reports that the fuel gauge shows inaccurate readings or remains unchanged after refueling. Cause The fuel level display may be incorrect due to one or both of the following conditions: 1. The Fuel Supply Control Unit (FSCU) may not recognize a refueling event if the Controller Area Network (CAN) does not enter sleep mode.
• 11038170Sep 19, 2026Other or unknown. Unavailability of MB Apps Complaint A popup is seen on the HU with the message "data connection temporarily not available". Cause MB Apps is officially sundowned for all vehicles with NTG5 Head Unit Variant. Remedy No support available for NTG5 Head Unit Variants for MB App related topics.
• 11036855Aug 26, 2026Transmission and drivetrain. Complaint While driving through muddy / sandy/ off road terrain "4Matic Currently Unavailable" message on the dash Cause This vehicle is not equipped with a fixed force distribution AWD, rather force is only applied to the front axle according to ESP calculations. As per GF28.00‑D‑ 9900A: "vehicles with 4MATIC all‑wheel system and variable force distribution, an electronically regulated multiplate clutch integrated…
• 11035562Jul 17, 2026Transmission and drivetrain. Model 907 with all-wheel drive (A4M) – All-wheel drive inoperative Complaint The customer may report one or more of the following: • All-wheel drive is unavailable or inoperative. • Rear wheel slip during acceleration on low-traction surfaces. • Noise from the front axle area while driving. • Message in the instrument cluster indicating all-wheel drive is unavailable due to overheating. • Fault code P27874B - The…
• 11035563Jul 1, 2026Other or unknown. ASSYST PLUS service reminder appears earlier than expected due to vehicle operating conditions Complaint The ASSYST PLUS service reminder appears earlier than expected. The customer or dealer may report that the vehicle did not reach the starting maintenance interval shown in vehicle documentation, option coding, sales literature, or the Owner's Manual.
• 11034411Jun 16, 2026Fuel system. Fuel Level Unchanged After Refueling Complaint The customer reports that the fuel gauge shows inaccurate readings or remains unchanged after refueling. Cause A. The Fuel Supply Control Unit (FSCU) fails to detect a refueling event B. The Fuel Level Sensor provides incorrect readings due to mechanical interference or installation issues
• 11034410Jun 15, 2026Transmission and drivetrain. Complaint Complaint A: The engine is jolting/bucking between 1700 and 1900 rpm. Complaint B: One or more mechanical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of mechanical fault codes in table below. NOTE: If one or more electrical related fault codes for EGR Valve are also present in CDI, utilize Complaint C. Review list of electrical fault codes…
• 11034417Jun 8, 2026Body and structure. Acoustic Warning or message occurring when a closed sliding door is not recognized Complaint Customer may state the warning message or indicator accompanied by acoustic tone alerting the sliding door is ajar when the door is completely closed Cause There are several reasons that lead to the failure occurring: - Mechanical damage through bending when loading and unloading - Worn contact plates --> After detachment…
• 11034412Jun 2, 2026Transmission and drivetrain. Complaint ASSYST values in XENTRY actual values and workshop menu of instrument cluster are implausibly excessive. Infor-mation: According to ASSYST values in XENTRY Diagnosis and the instrument cluster workshop menu, a larger jump (for example 20,000 km or 12,500 miles) has been detected within one ignition cycle that does not match the usual customer usage pattern/maintenance history.
• 11033160May 26, 2026Transmission and drivetrain. Sprinter 907 - Rear Axle Noise Diagnosis Best Practices Complaint Various noises from area of rear axle while driving Cause A: Howling Noises The high‑frequency howling noise is caused by the normal meshing behavior of the rear axle gear set, consisting of the pinion and crown gear. Two example noise recordings are provided in the attachment for reference. The volume and perception of this noise can vary depending…
• 11033165May 8, 2026Fuel system. Check engine light with fault code P3005CA in MRD1 (CDI) Complaint The check engine light is on, with a possiblility in a reduction of power and the presence of soot in the exhaust system. Fault code P3005CA: The diesel particulate filter efficiency is insufficient. Additional information: Additional fault codes may be present, related to the Diesel Particulate Filter (DPF) system or the Exhaust Gas Recirculation…
• 11031942Apr 29, 2026Fuel system. Complaint The customer reports that the fuel gauge shows inaccurate readings or remains unchanged after refueling. Cause A. The Fuel Supply Control Unit (FSCU) fails to detect a refueling event. B. The Fuel Level Sensor provides incorrect readings.
• 11031944Apr 9, 2026Body and structure. Complaint Crease formation on genuine leather seat covers in vehicles with low mileage Cause • objects left on the seats for extended periods of time (pressure marks) • objects wedged between the seat backrest and seat cushion (e.g. seat belt buckle) • light initial creases due to vehicle handling • light creases in the outer covers originating from the production process (missing finish) Remedy Heat treatment of…
• 11030629Mar 23, 2026Fuel system. The check engine light is illuminated, or the AdBlue warning is active, with recorded faults related to AdBlue quality or concentration. Complaint Customer reports an illuminated check engine light and or an AdBlue system warning indicating AdBlue quality out of specification. The vehicle may enter reduced performance mode. One or more of the following fault codes related to the AdBlue tank may be stored: P206B31…
• 11030627Mar 23, 2026Fuel system. Check engine light or Adblue warning with fault codes P206B31, P203B31, or P300494 present in AdBlue (SCR) control unit (N118/5) Complaint The check engine light or AdBlue warning is activated, accompanied by one or more of the following fault codes related to the AdBlue tank: P206B31 Malfunction of the concentration sensor for AdBlue; the signal is absent. P203B31 Malfunction of the AdBlue fill level sensor; the…
• 11030626Mar 23, 2026Other or unknown. Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset with fault code P13DF00 or P300685 Complaint SCR or AdBlue warning message cannot be reset. All fault codes in the AdBlue (SCR) control unit have been processed and corrected, however fault codes P13DF00 or P300685 remain active and stored. Cause The procedure for resetting the SCR or AdBlue warning message with XENTRY Diagnosis has not…
• 11029273Feb 24, 2026Engine. Check engine light or Adblue warning with fault codes P206B31, P203B31, or P300494 present in AdBlue (SCR) control unit (N118/5) Complaint The check engine light or AdBlue warning is activated, accompanied by one or more of the following fault codes related to the AdBlue tank: P206B31: Malfunction of the concentration sensor for AdBlue; the signal is absent. P203B31: Malfunction of the AdBlue fill level sensor; the…
• 11029272Feb 24, 2026Engine. Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset with fault code P13DF00 or P300685 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.
• 11029274Feb 20, 2026Other or unknown. Xentry Battery Tester results do not match with workshop Complaint The result from the XENTRY battery test does not match the current state of the battery. Cause The XENTRY battery tester uses the stored on-board electrical system data in the SAM module to access the health of the 12 volt battery. The XENTRY battery test may not take into account a single discharge event because the SAM or EZS cannot record the…
• 11028113Jan 16, 2026Engine. EGR Valve Diagnosis & Cleaning (and EGR Cooler Cleaning) – OM642, Sprinter 906/907 Complaint A: The engine is jolting/bucking between 1700 and 1900 rpm. Complaint B: One or more mechanical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of mechanical fault codes in table below. NOTE: If one or more electrical related fault codes for EGR Valve are also…
• 11028119Jan 15, 2026Engine. 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.
• 11026891Dec 1, 2025Transmission and drivetrain. Clunking noise on load change or gear engagement Complaint Clunking noise can be heard on some load changes or when changing from N->R or N->D Cause Movement of transfer case splines Remedy Apply bearing retainer (green) Loctite to both output shaft splines of the transfer case. Loctite 648, 609 and 603 are acceptable for this repair. Note: Do not apply Loctite to input shaft (connection with transmission) splines…
• 11026055Nov 13, 2025Body and structure. Electric Step will not extend/inoperative Complaint T57 Electric step inop with warning on cluster. Cause Possible damage to end position sensors. Remedy Please remove lower panel on step and inspect for damage to end position sensors. If no damage is found to end position sensors, please continue diagnosis of concern as normal.
• 11026054Nov 12, 2025Engine. Diverse messages in the instrument cluster, vehicle will not start, gears cannot be engaged Complaint Vehicle cannot be started, various messages in instrument cluster, gears cannot be engaged, ignition cannot be switched on, central locking has malfunction. Cause Water entry or condensation on vehicle, resulting possibly in oxidation at plug and/or water/moisture entry in control unit N73/8 for Electronic Ignition…
• 11024928Oct 6, 2025Other or unknown. The software for the communication module does not correspond to the latest series production configuration. For this reason, a remote software update to update the software for the communication module is planned for the affected vehicles. This update includes quality-enhancing optimizations for the communication module to improve the system stability and accessibility of connected services. MBUSA is conducting a…
• 11024927Oct 6, 2025Other or unknown. The software for the communication module does not correspond to the latest series production configuration. For this reason, a remote software update to update the software for the communication module is planned for the affected vehicles. This update includes quality-enhancing optimizations for the communication module to improve the system stability and accessibility of connected services. DVUSA is conducting a…
• 11023983Sep 26, 2025Other or unknown. Engine Oil Level Cannot Be Checked via Instrument Cluster Service Menu Complaint Sometimes the engine oil level cannot be determined using the instrument cluster's service menu. The following mes- sages may be displayed: •Engine oil level currently inoperative. See Attachment: Message "Engine oil level currently inoperative" (shown in German on model 907 with code C6L (Multifunction steering wheel)). •Engine oil…
• 11023978Sep 26, 2025Engine. Internal Diesel Engine Damage or Oil Sludge Formation Complaint Customer reports that the vehicle will not start, is difficult to start, or is making unusual noises. Inspection Findings: Upon inspection, engine bearings—including crankshaft, connection rod, and camshafts—exhibit significant signs of wear. Engine oil shows evidence of sludging, characterized by the presence of thick, gel-like, or semi-solid deposits…
• 11023982Sep 16, 2025Transmission and drivetrain. Complaint Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick test and/or no communication possible with VGS. Cause Transmission control unit Y3/8n4 Remedy For vehicles with 722.9 transmission: Ensure LI54.15-P-057373 is performed before replacing any component parts. After processing and complying with the above document(s): 1. Perform an ignition reset on Y3/8n4…
• 11023975Sep 4, 2025Electrical system. MBAG has determined the software of the control unit for the anti-theft warning system does not correspond to the current production configuration. There is a possibility that the alarm system (EDW) could be triggered while the vehicle is parked and locked. MBUSA is conducting a service campaign. An authorized Mercedes-Benz Sprinter dealer will update the anti-theft system software on the affected vehicles.
• 11022498Aug 12, 2025Other or unknown. Mercedes-Benz AG, the manufacturer of Mercedes-Benz Sprinter vans, has determined that on certain Model Years 2017-2021 Sprinter vehicles, the In Use Monitor Performance Ratio (“IUMPR”) function of the OBD system might not perform as intended under certain circumstances.
• 11022497Aug 12, 2025Other or unknown. Mercedes-Benz AG, the manufacturer of Mercedes-Benz Sprinter vans, has determined that on certain Model Year 2019-2021 Sprinter vehicles, the SCR control unit software does not correspond to the current series production configuration.
• 11021173Jul 25, 2025Other or unknown. Check engine light with fault code P20EEFE in the CDI control unit CDI (N3/47) Complaint Check engine light is illuminated with fault code P20EEFE "The efficiency of component 'SCR catalytic converter' is not sufficient" stored in the CDI control unit (N3/47). Cause Excessive ammonia slip is being detected in the SCR system, often triggered by IUMPR (In-Use Monitor Performance Ratio) thresholds.
• 11021170Jul 23, 2025Other or unknown. Check engine light with fault code P300E3B in the CDI control unit CDI (N3/28) Complaint Check engine light is illuminated with fault code P300E3B “The efficiency of component 'SCR catalytic converter' is not sufficient" stored in the CDI control unit (N3/28). Cause Excessive ammonia slip is being detected in the SCR system, often triggered by IUMPR (In-Use Monitor Performance Ratio) thresholds.
• 11019973Jun 24, 2025Electrical system. Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Adblue System: •P20F409: The Adblue consumption is too low. There is a component fault. •P202E84: The Adblue metering valve 1 (Motor side) has a malfunction. There is a signal below the permissible limit value. Cause The potential causes for these fault codes are: A. A leak in the Adblue System B…
• 11019967Jun 20, 2025Engine. Check engine light active - Fault P3007F1, P3007F2, P300CA8, or P300CA9 present in CDI control unit Complaint Check engine warning light active.
• 11019964Jun 16, 2025Engine. Check engine light with fault code P300E55 with H12 Complaint The check engine light is activated, accompanied by the following fault code related to the Exhaust gas recirculation cooler (low pressure): •P300E55 The efficiency of component 'Exhaust gas recirculation cooler (low pressure)' is not sufficient. Cause The issue is attributed to an error in the coding of the climate control unit software (HVAC177).
• 11019971Jun 12, 2025Electrical system. HV battery is not charging to its full capacity with restricted maximum SoC Complaint The vehicle's HV battery is not charging to its full capacity, with the maximum State of Charge (SoC) being restricted to a specific percentage. Cause The State of Charge (SoC) percentage limitation might be influenced by the Onboard Logic Unit (OLU), MBUX Headunit, or the Powertrain Control Unit (PTCU).
• 11019963Jun 6, 2025Engine. Internal Diesel Engine Damage or Oil Sludge Formation Complaint Customer reports that the vehicle will not start, is difficult to start, or is making unusual noises. Inspection Findings: Upon inspection, engine bearings—including crankshaft, connection rod, and camshafts—exhibit significant signs of wear. Engine oil shows evidence of sludging, characterized by the presence of thick, gel-like, or semi-solid deposits…
• 11018922May 19, 2025Engine. Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Adblue System: •P20F409: The Adblue consumption is too low. There is a component fault. •P202E84: The Adblue metering valve 1 (Motor side) has a malfunction. There is a signal below the permissible limit value. Cause The potential causes for these fault codes are: A. A leak in the Adblue System B…
• 11018921May 19, 2025Engine. Complaint The check engine light is activated, accompanied by the following fault code related to the Exhaust gas recirculation cooler (low pressure): •P300E55 The efficiency of component 'Exhaust gas recirculation cooler (low pressure)' is not sufficient. Cause The issue is attributed to an error in the coding of the climate control unit software (HVAC177). Remedy A software update to correct the coding error is…
• 11018920May 9, 2025Engine. Complaint Complaint A: The engine is jolting/bucking between 1700 and 1900 rpm. Complaint B: One or more mechanical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of mechanical fault codes in table below. NOTE: If one or more electrical related fault codes for EGR Valve are also present in CDI, utilize Complaint C. Review list of electrical fault codes…
• 11017570Apr 25, 2025Engine. In our continuing efforts to assure the proper performance of our products and to ensure the satisfaction of our customers, the warranty for the EGR Valve in the vehicles listed below has been extended from the original 5 years/100,000 miles to 15 years/150,000 miles, whichever occurs first.
• 11017565Apr 25, 2025Engine. EGR Valve Diagnosis and Cleaning Procedure using TUNAP 926® on 906, 907 Sprinter with OM642 Diesel Engine Complaint Complaint A: The engine is jolting/bucking between 1700 and 1900 rpm. Complaint B: One or more mechanical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of mechanical fault codes in table below. NOTE: If one or more electrical related fault…
• 11017561Apr 25, 2025Engine. Check engine light with reduced power with fault codes P300A6D, P300974, P300DFB, or P300DE8 Complaint: The check engine light is activated, accompanied by one or more of the following fault codes related to the Boost Pressure Positioner: • P300A6D The boost pressure is too low. Charge Air Cooler. • P300974 Component 'Boost pressure positioner' has a malfunction. The boost pressure is too low. • P300DFB Component…
• 11017563Apr 21, 2025Engine. Low Coolant Warning, Potential Misfire, and Absence of External Coolant Leaks Complaint Low Coolant warning with possible engine misfire caused by a leaking Charge Air Cooler (Intercooler), accompanied by one or more of the following possible fault codes related to the coolant system: P30040B: Component 'Temperature sensor downstream of charge air cooler' has an open circuit or short circuit to po- sitive. P25567B…
• 11017567Apr 17, 2025Engine. Check engine light with possible Adblue warning with fault code P20F409 or P202E84 Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Adblue System: •P20F409: The Adblue consumption is too low. There is a component fault. •P202E84: The Adblue metering valve 1 (Motor side) has a malfunction. There is a signal below the permissible limit value. Cause…
• 11017558Apr 3, 2025Engine. Check engine light illuminated - Fault code current P04D-B79 The crankcase ventilation system is interrupted. Complaint: Check engine light on. Fault code P04DB79 is current in the engine control module (N3/10). Cause: Open circuit or high resistance to crankcase vent line contact Remedy 1. Check the electrical connector for S208 vent line contact switch. Refer to attached photo of connection location. 2. Ensure…
• 11016429Mar 18, 2025Fuel system. Check engine light or Adblue warning with fault codes P206B31, P203B31, or P300494 when outside temperatures are below 32 degrees Fahrenheit. SCR Gen4 (KP7) Complaint: The check engine light or AdBlue warning is activated, accompanied by one or more of the following fault codes rela- ted to the AdBlue tank: P206B31: Malfunction of the concentration sensor for AdBlue; the signal is absent. P203B31: Malfunction of…

← All problems reported for the 2021 Mercedes-Benz Sprinter 3500