2020 Mercedes-Benz Sprinter 3500

This vehicle with 19711 mileage was parked in the driveway. The engine started normally, but a red error message stated, "Service Required Do Not Shift Gears Visit Dealer". I contacted the local dealership and Mercedes Roadside Assistance was not able to reset the software. The driveshaft was disconnected and two tow trucks were needed to pull the vehicle out of the driveway and then tow to the dealership. The technician found "internal electrical fault in ISM causing shifter not to come out of park". The electronic shifting unit was replaced and the vehicle is functioning normally. The switching unit did not have any external damage and there was no evidence of corrosion on the electrical terminal. This vehicle has had all of the recommended service at the dealership. It was previously serviced on Nov. 5, 2025 for recall 2025070011(update controll unit software). There were no transmission error codes. In approximately February 2026, the vehicle had not been started and the battery was dead. I jumped the vehicle to start it and then used a battery charger. No one was injured. Luckily this occured in my driveway. Mercedes assistance was appreciated. However, there was absolutely no indication of a problem prior to this. There is no mechanism to shift into neutral to move the vehicle unless the drive shaft is disconnected. If this were to occur on a busy street, it is possible that many people could have been injured. I am reporting this "near miss" in case there are other similar problems that have been reported. I believe that the unit will be inspected by Mercedes as well.

NHTSA ID

11759262

Incident

Aug 17, 2026

See attached document for complaint.

NHTSA ID

11656249

Incident

Apr 2, 2025

We were driving on Rt. 32 north of Canaan Valley State Park in West Virginia. Suddenly the dashboard display began flickering on and off, displaying numerous multiple warning errors and alarms, and the windshield wipers began working and would not shut off. Turn signals would not function. Warning messages included instructions not to shift gears, lane keeping assist and automatic braking disabled, "Steering Malfunction", and many other errors. We have a partial video showing part on the incident. Dealer found evidence of corrosion on the Electronic Ignition System module, and sticking ignition on/off switch, which was indicated as the cause of the problem.

NHTSA ID

11624745

Incident

Oct 29, 2024

Mercedes Benz 3500 XL Sprinter motorhome, 2020 chassis. May 2023 MB did several recalls & software updates which MB USA headquarters said those changes could've affected the Cruise Control & Adaptive Cruise Control because these systems worked excellently until May '23, in my local MB Sprinter service. These systems have not worked more than 2% of the time. MB keeps changing items with no improvement. I told them to test on I-95 or The turnpike, as that's when we use it safely. Service tech said they're not allowed to test it there; we told them that's when it won't work, when we need it. Dozens of trips keep proving MB needs a permanent fix for the safety features we paid & need. I KEEP TRYING TO ADD MY 10 SECOND VIDEO CLIP BELOW BUT YOUR SITE WON'T TAKE IT. IT SHOWS the Cruise Control 3 blinking BLANK cursors on dash monitor where the mph Cruise miles #s setting should display. I showed this to my local MB service who sent video to MB USA HEADQUARTERS. Under my active Warranty they need to CHANGE the WHOLE CRUISE CONTROL SYSTEM. THESE bandaids are exhausting time & resources for all of us. Now their engineers say it could be the seat sensor. I've hamstring pain & need a seat cushion while driving. This EXCUSE is FAULTY like their FAULT CODES, as randomly I don't use my seat cushion & Cruise Control & thus Adaptive Cruise Control won't work. Thank you for your help! [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11581506

Incident

May 10, 2023

The contact owns a 2020 Mercedes-Benz Sprinter 3500. The contact stated that the message “Brake Assist Inoperable - See Owner’s Manual” message was displayed. The warning light remained illuminated for several miles before turning off. The vehicle was taken to the local dealer on three occasions, where it was diagnosed that there was a low sensor, approximately 1.5 centimeters, and the sensor was adjusted. The fault code displayed was C174AFB on two diagnostic tests. The vehicle was repaired but the failure recurred. Additionally, the mechanic informed the contact to keep the front of the vehicle clean. The manufacturer was not contacted. The failure mileage was approximately 6,000.

NHTSA ID

11528852

Incident

Mar 1, 2021

Mileage

6,000 mi

The above are wouldn't allow me to place a check mark in the appropriate boxes. In the Standard Vehicle Components and ADAS sections, I was unable to check the boxes, but our vehicle contains ALL of the items in the first and second sections. The vehicle was dropped off at Lazy Days, Tampa on October 21, 2022 and so far they have been unable to provide an estimate or advise when we may receive our repaired motorhome. This dealer has a reputation for very poor follow-up. If you provide an email, I can send you the items to be checked. Despite going through two highway barriers at about 40 to 50 mph, the air bag system failed to deploy. The vehicle stopped as we ran into a fence at an angle of ten to fifteen percent. We luckily dodged five opportunities to be killed. My wife jumped out of the vehicle when it stopped and screamed so loud I could not believe it was her. I've been married 28 years and was shocked at her condition. I had to hold her to quiet her. The first hint of a problem was the brakes failed and the cruise control seemed to increase speed, but I'm not absolutely sure of this, but it felt like it. There are two Tiffin reps at Lazy Days, which I wrote about this, twice, and called leaving a message and they have not sought to get in touch with me. The supervisor, [XXX], of the intake service advisor, [XXX] said she would be in touch. I told her there was so much wrong, we understand if it took longer than her usual case. When it was about a month in, I called and discovered he no longer works there. They failed to assign someone to let us know of any progress. I called and left messages for [XXX] (Lazy Days employee) and wrote two emails and he also failed to get in touch, but he assigned [XXX] who called us asking what was wrong with our coach. I was beside myself. [XXX] failed to even read the invoice! I told her to read the invoice and call us back. Ran out of room. INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

NHTSA ID

11497581

Incident

Oct 8, 2022

The contact owns a 2021 Tiffin Wayfarer built on a 2020 Mercedes-Benz Sprinter 3500. The contact received notification of NHTSA Campaign Number: 21V610000 (Trailer Hitches) however, the part to do the recall repair was not yet available. The local dealer was contacted and the contact was informed that parts were not yet available. The RV was then towed to an independent mechanic but was not repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue but provided no assistance. The contact had not experienced a failure.

NHTSA ID

11485642

Incident

Sep 21, 2022

The contact owns a 2020 Mercedes-Benz Sprinter 3500. The contact received notification of NHTSA Campaign Number: 22V360000 (Electrical System, Communication) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was not made aware of the issue. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

NHTSA ID

11483702

Incident

Sep 9, 2022

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 into the transfer case provides for the torque distribution. If the multiplate clutch is open during normal driving operation, only the rear axle drives the vehicle. If the clutch is closed, the front axle comes into play." The message "All‑wheel drive temporarily unavailable" is not indicative of a malfunction but rather informs the driver that all‑wheel drive is currently not available due to the transfer case clutch overheating. This occurs when the vehicle is driven in such a way that maximum front axle torque is needed for an extended period, causing the clutch to get excessively hot. If the vehicle is being driven under heavy load conditions, like in deep sand or snow, the rear axle may slip while the front axle does not deliver power. The transfer case then attempts to distribute torque to correct the slip, but it is limited to a maximum of 1150 Nm to protect the front axle transmission. In extended heavy‑load scenarios, the multidisk clutch in the transfer case slips, increasing the temperature. If the temperature model detects a critical temperature of 240°C, the system protects itself by disconnecting until it cools down to around 160°C, after which the all‑wheel drive becomes available again and the warning message disappears.Vehicles can handle flat terrain easily, but steep slopes or situations where wheels slip might cause additional resistance, leading to the described protection events and message in the dash. Remedy Recommendation is to release the vehicle back to the client with an explanation that the vehicle is operating as designed. Please advise the client to limit vehicle acceleration in limited traction situations to avoid disabling of the 4Matic system ‑ please see "Notes on all‑wheel drive" provided in the operators manual.

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 temperature of the clutch is too high. There is a fault due to overtemperature may be stored in control unit N15 (Transfer Case). Cause An internal failure of the front axle differential may result in loss of torque transfer to the front wheels. In some cases, a fracture of the weld between the crown gear and differential housing may be present. Remedy Replace the front axle differential in accordance with: AR33.30-D-0525TSY – Replace Front Axle Differential.

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. The service reminder may appear significantly earlier than anticipated even though no faults are stored and no malfunction is present in the vehicle. The remaining distance and remaining time continue to decrease normally until the service reminder is displayed. Cause This condition is not caused by a malfunction of ASSYST PLUS. ASSYST PLUS is a dynamic maintenance management system that continuously evaluates vehicle usage and opera-ting conditions to determine maintenance requirements. The starting maintenance interval specified by variant coding represents a maximum interval that may only be achieved under favorable operating conditions. Actual maintenance intervals may be significantly shorter depending on vehicle use. Vehicle operating conditions such as driving conditions, engine load, engine operating conditions, idling, short-trip operation, environmental influences, oil aging, and Diesel Particulate Filter (DPF) regeneration activity may reduce the maintenance interval from its starting value. These conditions may accelerate engine oil aging through increased soot loading, fuel dilution, moisture accumulation, and additional engine operating stress. As a result, the remaining distance and remaining time until the next service may be reduced from the starting maintenance interval. Remedy Do not replace any parts. A due service must be assumed if the maintenance data calculated by ASSYST PLUS indicates that service is required.

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 PDF document in attachments. Complaint C: One or more electrical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of electrical fault codes PDF document attached. NOTE: This LI supersedes LI14.20-N-073813, which is no longer valid. Cause Cause of Complaint A: Increased friction between the EGR Valve blade and seat due to soot deposits causing a delay of the EGR Valve being able to reach the target value of the EGR Valve position controller. NOTE: This causes the EGR Valve blade and potentially the boost pressure controller to oscillate. Cause of Complaint B: Soot deposits between the EGR Valve blade and seat leading to the EGR Valve no longer being able to meet the de-sired target of the EGR Valve position controller. Cause of Complaint C: Internal EGR Valve or other electrical faults related to the EGR Valve function. Remedy Remedy for Complaint A: Perform the following steps: 1. Disable the EGR Valve (Y27/17) by disconnecting the electrical connector. 2. Perform a test drive to check if the jolting/bucking issue resolves. 3. If the jolting/bucking is resolved, proceed to Remedy for Complaint B. 4. If jolting/bucking is still present, proceed with diagnosis to determine the root cause. Consider checking the follo-wing, but not limited to: •EGR system including the EGR Cooler, EGR Bypass Flap, EGR Temperature Sensor, and pipes for proper operati-on, excessive sooting and/or clogging, as well as EGR Bypass Flap vacuum element, switchover valve, and vacuum system. •Visually check the leak oil line or T-piece; reference LI07.00-N-059118.

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: Malfunction of the concentration sensor for AdBlue; the signal is absent. P203B31: Malfunction of the AdBlue fill level sensor; the signal is absent. P300494: The quality of the AdBlue is insufficient. Background AdBlue must meet ISO 22241 quality requirements. ISO 22241 urea content limits for AdBlue are 31.8 percent to 33.2 percent by mass. AdBlue begins to crystallize and freeze at approximately 12 degrees F. Freeze-thaw does not degrade the product when uncontaminated, and the bulk concentration returns to normal after complete thaw and mixing. Cause In cold soak conditions and during freeze thaw exposure, the tank contents may not be uniform at the time of sampling or system checks. During freezing and partial thaw, ice formation can temporarily create concentration gradients in the tank. As a result, urea percent readings can vary based on sample location and the state of thaw and mixing, which can produce apparent out of range readings even though the bulk fluid returns to normal after mixing. Remedy Testing Do not use a single urea percent reading taken from frozen, partially frozen, or not fully mixed AdBlue to make a repair or responsibility decision. Confirm full thaw and ensure tank contents are mixed before sampling. 1. Confirm full thaw - Confirm the AdBlue tank and associated components are fully thawed before sampling. - Do not sample slushy or partially frozen fluid. 2. Mix tank contents - Perform a road drive intended to mix the tank contents before sampling. - Idle time alone is not a reliable substitute for mixing. 3. Sample and measure - Take the sample and measure with the MB refractometer per the MB tool instructions. - Record the urea percent value. 4. Interpret the result against ISO 22241 limits - Within specification is 31.8 percent to 33.2 percent urea by mass. 5. Repeat if out of specification - If out of specification, repeat after an additional mixing drive to reduce sampling variation. - If still out of specification after full thaw, mixing, and repeat measurement, treat as a true out of specification result and proceed with further diagnosis per applicable MB guidance. Acceptance criteria AdBlue is within the ISO 22241 specification when the urea percent is between 31.8 percent and 33.2 percent by mass. Values outside this range are out of specification and require further diagnosis after completing the full thaw and mi-xing procedure above. Cross reference For vehicles with fault codes P206B31, P203B31, or P300494, refer to LI49.20-N-078838 for the detailed diagnostic and repair procedure. If a SCR or AdBlue warning reset is required after correction, refer to LI49.20-N-075995. Complete the diagnostic and corrective steps first. Perform the warning reset only after the underlying fault condition has been corrected. Warranty information and claim handling

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. 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.