Recalls, owner-reported complaints, investigations and safety data
Data refreshed
Our database contains 3 NHTSA owner-reported complaints for the 2024 Mercedes-Benz C 300 4MATIC, most frequently naming the brakes, driver assistance and electrical categories. 118 manufacturer communications are on file.
Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.
When owners filed reports about this model year
Not enough dated records to plot a meaningful trend — 3 months of data.
Complaints grouped by the component NHTSA recorded
Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.
No recalls in our database for this model year
That does not guarantee a specific vehicle is unaffected — recalls are issued against VINs, and new campaigns are announced regularly. Check a VIN on NHTSA.gov.
Reports submitted to NHTSA, shown in the owner's own words
Dashboard reading incorrectly. Blackout screen while driving. Mileage incorrectly reading. Speed limit incorrectly reading while driving the Dashboard pick up the undercarriage camera. The electricity on the car keep popping up. I have been complaining over 1yr since I lease the vehicle they only offer to trade with me paying the expenses. Gas gage not reading correctly
Dealership: Mercedes-Benz of Santa Fe, 2586 Camino Entrada, Santa Fe, NM 87507 I am filing this complaint regarding multiple unresolved safety defects in my 2024 Mercedes-Benz C300 persisting across numerous repair visits since February 2026. Defect 1 – Recurring Strut Assembly: Following an AC sensor replacement on February 11, 2026, a loud rattling noise emerged from the dashboard/strut area. The vehicle was retained 22 days without resolution. The strut plate was repaired, but the noise recurred. Parts were ordered for the strut assembly, requiring me to drive the defective vehicle for approximately two additional weeks. As of June 8, 2026, the noise remains unresolved. A defective strut assembly affects handling, stability, and steering — creating serious risk at highway speeds. Defect 2 – Safety Systems Disabled: Following the strut plate repair, all driver assistance systems — including collision avoidance and lane keeping — were completely disabled. A warning message confirmed the systems were inoperable. A subsequent software update was required to restore them. Defect 3 – Check Engine Light; Dealer Advised Continued Operation: While driving with the unrepaired strut assembly, the check engine light illuminated. I have photographic evidence. Service Manager Simon explicitly advised me it was safe to continue driving. I contest this. I was not provided a loaner vehicle. Inaccurate Service Records: On June 5, 2026, service notes falsely stated the check engine light was not illuminated. I presented photographic evidence to service representative Robert Rodriguez, who verbally confirmed the photograph. The record was not corrected, potentially obscuring defect patterns from NHTSA review. I respectfully request NHTSA add this complaint to the public database, investigate whether this model has a safety-related defect pattern, and review the dealership's practice of advising consumers to operate vehicles with known structural defects.
I had to take a detour one night coming home, the detour led to a bridge that connects to a highway. Approaching the bridge my car started to jerk and pop up with all of these notification about “blind spot assistance” is down, “car engine failure, please check user manual”, “car malfunction” with a engine battery symbol. All the while the engine light was on. All these warning was popping up one after another, while I was trying to merge onto the bridge. Mind you there is no shoulder currently during the active merging or on the bridge, but I didn’t think of what would happen next. As I merge onto the bridge at 35mph the car shuts off completely on me. My car automatically sets itself into Neutral mode and I was rolling on the bridge at 35mph, no shoulder and no brakes or gas to move properly. I called the police but they won’t dispatch a officer unless I am in a accident or about to cause on, but they heard I am rolling at 35mph and they said from her words herself “I can’t send a officer over for your reason ma’am, are you a threat to others or about to crash? Can’t you just brake?” My car system never turned back on, I stepped my foot on the brakes all the way praying something will work as I existed the bridge onto a small shoulder. The emergency brakes came on as I keep swerving onto the grass. As everyone was going 65mph I don’t know why I wouldn’t impose as a threat if I have no control over my car from oncoming traffic. This is a very dangerous situation, and my service shop said we try to retest the issue/diagnostics but couldn’t replicate the situation and told me that my car is fine. But this isn’t the first time that happened and it also wasn’t the last. I don’t know what test they’re running but telling me it’s a simple system malfunction error every time is playing with my lifespan. Do not recommend.
A bulletin sent by a manufacturer to its dealers. Not a recall, and repairs are not necessarily free.
ELECTRICAL SYSTEM; POWER TRAIN
Complaint Diverse functional limitations in the vehicle in combination with various warning and fault messages in the instrument cluster display. Cause Communication timeouts mean that communication errors may occur in the on‑board electrical system, which can result in various fault messages being displayed in the instrument cluster. This could be down to delayed feedback from the drivetrain control unit (N127) (CPC) to other control units networked to the CAN bus. Information: Only valid for vehicles through production period 10/2025. Not valid for vehicles with control unit CDCC (N125, central controller charging and driving) • It may not be possible to attribute any communication errors stored in the control units on the CAN bus to a specific cause • In rare instances, there may be a brief activation of the yellow warning lamp for engine diagnosis or there may be a sporadic delay with the start enable. • There may not be any specific fault codes present that indicate a specific component. Example image: Fault messages in instrument cluster: The reason for this could be down to delayed feedback from the control unit CPC3 to other control units networked on the CAN bus. Remedy Do not replace any components!!! ******************************************************************************************************* 1. Connect charger (see AR54.10‑P‑1127WT). Note: An adequate voltage from the on‑board electrical system battery must be guaranteed for the entire duration of the work procedure. Otherwise, the control units could be damaged if an undervoltage occurs. Information: Observe the operating instructions of the charger. Information: Use the charger to ensure an adequate voltage (at least 12.5 V) from the on‑board electrical system battery. ‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑ 2. Connect diagnostic system (see AD00.00‑P‑2000‑06FR). Note: Always use the latest XENTRY Diagnostics software release. Information: Strict compliance with the operation steps in XENTRY Diagnostics is absolutely essential. ‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑ 3. Select control unit N127 (CPC) via the direct link using XENTRY Diagnosis. Information: To do so, select the following menu items: Control units view → Drive systems → N127 ‑ "Drivetrain" control unit (CPC) ‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑ 4. Update software for control unit N127 (CPC) (see AR54.21‑P‑0014‑01Y). Info: To do so, select the following menu items: Adaptations → Control unit update → Update control unit software. Information: You are then automatically guided through the steps "Update of control unit software" and "SCN coding". Always observe the following operation steps at all times ‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑ 5. Disconnect diagnostic device from vehicle (see AD00.00‑P‑2000‑06FR). ‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑ 6. Disconnect charger from vehicle (see AR54.10‑P‑1127WT).
ELECTRICAL SYSTEM
Issue Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, is launching an OTA update to the subject vehicles to provide an enhanced user experience. This OTA update includes enhancements to the MBUX voice assistant. Remedy MBUSA will conduct an OTA service campaign. Remote software updates are automatically downloaded and installed in the customer’s vehicle free of charge and do not require a dealer visit.
SUSPENSION
Complaint Wheezing noises/squeaking noises from the front shock absorbers when passing over surface undulations and rough road. Noise MUST match those heard in the attached videos. Cause • Wheezing noises: Flow noises of the damper oil • Squeaking noises: From the mechanical rubber valve in the dividing piston Remedy In case of complaints, the front shock absorbers must be replaced. If shocks have been replaced and noise persists, please open a TIPS case to the Body, Chassis, Entertainment inbox.
STRUCTURE:BODY
Complaint Wheezing noises/squeaking noises from the front shock absorbers when passing over surface undulations and rough road. Noise MUST match those heard in the attached videos. Cause • Wheezing noises: Flow noises of the damper oil • Squeaking noises: From the mechanical rubber valve in the dividing piston Remedy In case of complaints, the front shock absorbers must be replaced. If shocks have been replaced and noise persists, please open a TIPS case to the Body, Chassis, Entertainment inbox.
ENGINE
Complaint Oil seeping from turbocharger oil return line at connection to engine block. Low oil level warning. Oil observed under vehicle. Cause Return line under tension due to turbo rotation. Remedy Inspect turbocharger housing for rotation (refer to attachment). If rotation is confirmed, the turbocharger and oil return line must be replaced.‑Resealing or replacing only the oil return line is not sufficient and will not resolve the symptom.‑Clean noise insulation on right side of engine if necessary. Replace insulation if cleaning is not sufficient.‑Observe foot notes regarding additional parts in XENTRY parts information when ordering turbocharger.
ELECTRICAL SYSTEM
Issue A software update will be performed that provides enhancements to the robustness and system stability of the communication module. The update is free of charge and runs in the background, which takes about 8 minutes to install. During this time, the vehicle can be driven without any restrictions, and the new software will be active with the next ignition cycle. Remedy MBUSA will conduct an OTA service campaign. Remote software updates are automatically downloaded and installed in the customer’s vehicle free of charge and do not require a dealer visit.
Manufacturers file copies of the bulletins they send to dealers with NHTSA. These often describe diagnostic or repair procedures for a known condition. They are not recalls: repairs described in a bulletin are usually only free if the vehicle is still under warranty or the manufacturer has extended coverage.
Complaint and recall counts across every year of this model
Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers. Older model years have had longer for reports to accumulate.