2015 Mercedes-Benz C300 Transmission & Powertrain Problems
NHTSA lists 20 Transmission & Powertrain complaints for the 2015 Mercedes-Benz C300, 5% of its 381 total complaints for the year. Owners report sudden power loss into limp mode, harsh shifting, and PCV/turbo related stalling, with a median failure mileage of 20,147. No related recalls are listed for this area.
- Transmission & Powertrain complaints
- 20
- 5% of 381
- Crashes reported
- 0
- Fires reported
- 0
- Injuries reported
- 0
- Median mileage
- 20,148 mi
- Related recalls
- 0
Typical transmission symptoms owners report
- Vehicle unexpectedly loses drivetrain power and enters limp mode, sometimes with a collision assist or cruise control warning displayed.
- The 7-speed transmission shifts harshly between 1st and 3rd gears, especially when slowing to a stop, while shifts from 3rd to 7th stay smooth.
- Engine independently decelerates while driving, with RPM dropping between 4,000 and 5,000, then returns to normal after the car is shut off and restarted.
- Owners report a positive crankcase ventilation (PCV) valve failure that triggers a check engine light and is described as a recurring issue on this model.
- Shift module fails to engage gears from park to drive or reverse, with a diagnostic code showing lost communication with the gear module, even after dealer software reprogramming.
- Turbo booster is reported as defective, causing intermittent failure to accelerate when the pedal is pressed.
When 2015 Mercedes-Benz C300 transmission complaints were filed
First complaint Aug 4, 2015, latest Oct 30, 2025.
Transmission & Powertrain recalls for the 2015 Mercedes-Benz C300
No safety recalls on record for this model year.
Transmission & Powertrain complaints by C300 model year
Raw complaint counts per model year; newer years have had less time to accumulate complaints.
Frequently asked questions
- How many transmission and powertrain complaints does the 2015 Mercedes-Benz C300 have?
- NHTSA lists 20 Transmission & Powertrain complaints for the 2015 C300, which is 5% of the 381 total complaints filed for that model year.
- Is there a transmission recall for the 2015 Mercedes-Benz C300?
- No related recalls are listed for the Transmission & Powertrain area on the 2015 C300 in the data reviewed.
- At what mileage do 2015 C300 transmission problems typically appear?
- The median mileage at failure for Transmission & Powertrain complaints on the 2015 C300 is 20,147 miles.
- What specific transmission symptoms do 2015 C300 owners report?
- Owners describe sudden limp-mode power loss, harsh low-gear shifting, unexplained RPM drops while driving, PCV valve failures, and shift module communication errors.
- Were there any crashes or injuries linked to these complaints?
- NHTSA records show 0 crashes, 0 fires, and 0 injuries among the 20 Transmission & Powertrain complaints for the 2015 C300.