NHTSA Service Bulletin 11003093: 2022-2024 Mercedes-benz C 300
Official manufacturer communication context for 2022-2024 Mercedes-benz C 300, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.
Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.
Complaint When the pre-entry climate control was activated via Mercedes me connect App, the driver no longer had access to a cooling output for the vehicle interior once the vehicle had started. Cause If pre-entry climate control is activated, the engine fan should switch on to regulate corresponding temperature and pressure rises in the refrigerant circuit. Since the engine fan is not switched on, high pressure (overpressure) can arise in the refrigerant circuit and consequently switch it off. Remedy Software update in drivetrain control unit (PTCU) Should further complaints arise after the software update, please create a TIPS case with the following information: The customer complaint in detail Current quick test Refrigerant filling quantity Actual values for climate control at the time the complaint occurs High and low-pressure values at the time the complaint occurs
What this bulletin may mean before buying
Treat this as service research, not a verdict on one car. Before you buy, compare this communication with official recall campaigns, model-level owner complaint patterns, and the exact vehicle’s VIN-decoded specifications. A bulletin can help you ask a seller or dealer sharper questions about software updates, known repairs, warranty extensions and service history.
Affected products listed in this communication
Buyer checklist
- Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
- Check recall campaign pages for safety actions that may require dealer repair.
- Compare this bulletin with common problem pages for the same model and component area.
- Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
- Use the used-car buying checklist and get an independent inspection.
Frequently asked questions
What is NHTSA service bulletin 11003093?
Complaint When the pre-entry climate control was activated via Mercedes me connect App, the driver no longer had access to a cooling output for the vehicle interior once the vehicle had started. Cause If pre-entry climate control is activated, the engine fan should switch on to regulate corresponding temperature and pressure rises in the refrigerant circuit. Since the engine fan is not switched on, high pressure.
Is a service bulletin the same as a recall?
No. A recall is a safety campaign with a required remedy for affected VINs. A service bulletin or manufacturer communication usually describes diagnostic, repair, software, warranty or service information.
How should a used-car buyer use this bulletin?
Use it as a research signal. Compare it with recalls, owner complaints, service records, a VIN report and an independent inspection before buying.
Check the exact VIN before you buy
Model-level pages show public safety patterns. A full VIN report helps confirm the exact vehicle, decoded specs, recall applicability and buyer checks.
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