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2017 Mercedes-Benz SLC-Class problems, recalls and owner complaints
What the 2017 Mercedes-Benz SLC-Class has been recalled for, how often it fails the UK MOT and what owners report, from official government data. Updated October 25, 2026.
- 0safety recalls
- 4owner complaints
- 0crash reports
- 0fire reports
- 14%fail the UK MOT
Every Mercedes-Benz SLC-Class model year with its number of owner complaints. Pick a year to compare.
What goes wrong with the 2017 Mercedes-Benz SLC-Class?
The components named most often in the 4 owner complaints. One complaint can name several, so the shares can add up to more than 100%.
Has the 2017 Mercedes-Benz SLC-Class been recalled?
NHTSA lists no safety recalls for the 2017 Mercedes-Benz SLC-Class as of October 25, 2026. Recalls can be issued at any time, so check your VIN before you rely on this.
Is the 2017 Mercedes-Benz SLC-Class recalled in the UK or Europe?
Recalls issued by the UK's DVSA and through the EU's Safety Gate system that cover this model and build period. European models can differ from U.S. ones, and "years estimated" means the recall gave no build dates, so confirm your own car with your registration or VIN.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe communication module may be deactivated
Risk: The communication module may be deactivated
Fix: Carry out a check of the configuration of the communication module on affected vehicles and if necessary activate the communication module.
UK DVSAThe software of certain communication modules may not meet specifications
Risk: The software of certain communication modules may not meet specifications.
Fix: Carry out an update to the software of the communication module on affected vehicles.
UK DVSAThe emergency call system (ecall) does not meet the specification
Risk: On affected vehicles the software of the communication module for the emergency call system does not meet the specification
Fix: Update the software of the communication module for the emergency call system
UK DVSAEngine control unit software to be updated
Risk: Improve the vehicle emissions via software updates.
Fix: Update the relevant control unit's software and if necessary replace the NOx sensors.
UK DVSAEmission output requires improvement
Risk: Emission output requires improvement
Fix: Update software in the engine control unit and replace the NOx sensor if required.
UK DVSADoors on left vehicle side (passenger side) remain permanently locked after the vehicle has been locked/unlocked with the remote control key
Risk: Possible inability to open the left hand door externally or internally.
Fix: Replace the affected door locks on the left side of the vehicle.
UK DVSABrakes may overheat creating a risk of smoke and/or fire
Risk: The software for the Electronic Stability Program (ESP) is faulty. The fault could lead to a low residual pressure in the hydraulic system so the brakes are applied and gain heat. This increased heat will apply the brakes further and could adversely affect the brake fluid. Fire in the wheel housing cannot be ruled out.
Fix: Recall the vehicles that are likely to be affected and update the software for the ESP.
How often does the 2017 Mercedes-Benz SLC-Class fail its MOT?
Why they failed: the share of failed tests with at least one fault in each area (a test can fail on several). Cars first registered in 2017, tested in Great Britain in 2023; first registration is usually, but not always, the model year. Source: DVSA anonymised MOT tests and results, Open Government Licence v3.0.
What do 2017 Mercedes-Benz SLC-Class owners report?
4 of the 4 complaints, the most recent for the most-reported components, as the owners wrote them. NHTSA removes names and VINs; long reports are trimmed. CarHooq has not verified individual claims.
The contact owns a 2017 Mercedes-Benz SLC300. The contact stated that while driving at an undisclosed speed, there was a loud whistling sound coming from the upper panel of the roof. The vehicle was taken to an independent mechanic, where it was diagnosed and determined that the bonding of the upper roof panel had failed and required to be replaced. The vehicle was not repaired, and the contact was referred to the dealer for additional assistance. The dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and referred the…
On September 6, 2025 while driving approximately 70 mph, the front roof panel of my vehicle detached completely. This was not only a costly failure, but also an extremely dangerous incident that could easily have caused severe injuries or fatalities — either to myself, my passengers, or other motorists on the roadway. As you are aware, Mercedes-Benz has already acknowledged this precise risk through NHTSA Recall No. 21V197000 / Campaign 2021070010, later expanded under NHTSA Recall 23V854000. These documents confirm that the bonding adhesive used on the front roof panel can deteriorate…
Piston 1 broken at 76000 miles. Compleat engine failer
TL* THE CONTACT OWNS A 2017 MERCEDES-BENZ SLC300. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBER: 21V058000 (COMMUNICATION, ELECTRICAL SYSTEM) HOWEVER, THE PART TO DO THE RECALL REPAIR WAS NOT YET AVAILABLE. THE VEHICLE WAS TAKEN TO MERCEDES-BENZ OF HILTON HEAD (155 FORDING ISLAND RD, BLUFFTON, SC 29910) WHERE THE CONTACT WAS INFORMED THAT THE UPDATE WAS NOT YET AVAILABLE. THE MANUFACTURER WAS MADE AWARE OF THE ISSUE AND CONFIRMED THE INFORMATION PROVIDED BY THE DEALER. THE CONTACT HAD NOT EXPERIENCED A FAILURE. PARTS DISTRIBUTION DISCONNECT.
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2017 Mercedes-Benz SLC-Class: questions owners ask
Is the 2017 Mercedes-Benz SLC-Class reliable?
NHTSA data alone cannot rate reliability, but it shows what owners reported. Owners filed 4 complaints with NHTSA about the 2017 Mercedes-Benz SLC-Class; the most common categories were communication (1, 25%), electrical system (1, 25%), engine (1, 25%). There are no safety recalls listed for this model year.
What are the most common problems with the 2017 Mercedes-Benz SLC-Class?
Across 4 owner complaints filed with NHTSA, the categories mentioned most often are communication (25% of complaints), electrical system (25% of complaints), engine (25% of complaints), structure (25% of complaints). One complaint can name several components.
Does the 2017 Mercedes-Benz SLC-Class have any recalls?
As of October 2026, NHTSA lists no safety recalls for the 2017 Mercedes-Benz SLC-Class. Recalls can be issued at any time, so check your VIN at nhtsa.gov/recalls.
Check your own SLC-Class
Counts are a starting point, not a verdict: popular models collect more complaints because more of them are on the road, and NHTSA does not verify individual reports. To see whether a recall is still open on your car, enter your VIN at nhtsa.gov/recalls (U.S.) or your registration at check-vehicle-recalls.service.gov.uk (UK). Had a safety problem? Report it to NHTSA; complaints are what trigger investigations and recalls.
Data: NHTSA Office of Defects Investigation recall and complaint databases (public domain), DVSA anonymised MOT results (Open Government Licence v3.0), DVSA vehicle recalls (Open Government Licence v3.0), retrieved October 25, 2026. Model year 2017 only.