2015 Mercedes-Benz C300 Engine Problems

NHTSA component category: ENGINE · data through 07/12/2026

127Engine complaints

33.8%Of all 376 complaints

#1Most-reported category

Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.

How engine ranks on this vehicle

ENGINE127 · 33.8%

FUEL/PROPULSION SYSTEM66 · 17.6%

Unspecified / other63 · 16.8%

ELECTRICAL SYSTEM49 · 13%

STRUCTURE:BODY33 · 8.8%

Share of the 376 complaints citing each category; one complaint can cite several. Full breakdown on the 2015 Mercedes-Benz C300 overview page.

What owners report

“BOUGHT USED MERCEDES C300 2015 4MATIC ON FEB'2019, ODOMETER READING WAS 44K MILES WITH CLEAN CARFAX REPORT. AFTER DRIVING JUST ABOUT 7K MIKES MORE, AT…”NHTSA complaint 11290795 — filed 12/23/2019

“WHILE THE VEHICLE IN MOTION, HEARING A LOUD SOUNDS COMING FROM THE ENGINE. AT FIRST IT'S SOUNDED LIKE A ROCK IN A TIN CAN, LATER…”NHTSA complaint 11290346 — filed 12/20/2019

“THE CONTACT OWNS A 2015 MERCEDES-BENZ C300. WHILE THE CONTACT'S DAUGHTER WAS DRIVING AT AN UNKNOWN SPEED, THE VEHICLE FAILED TO ACCELERATE AND BEGAN TO…”NHTSA complaint 11278131 — filed 11/04/2019

Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.

Engine complaints by year filed

Frequently asked questions

Does the 2015 Mercedes-Benz C300 have engine problems?

Engine is the most-reported problem area on the 2015 Mercedes-Benz C300: 127 of 376 complaints on file (33.8%). Complaints are unverified owner reports, not confirmed defects.

How many complaints does the 2015 Mercedes-Benz C300 have in total?

376 complaints were on file with NHTSA as of 07/12/2026. Across all categories, 9 involved a crash, 1 involved a fire, 7 reported injuries, and none reported deaths.

What does NHTSA's engine category include?

NHTSA assigns each complaint to standard component categories; this page reports the ENGINE category exactly as NHTSA defines and records it.

About this data — Complaint figures on this page are consumer reports submitted to the National Highway Traffic Safety Administration (NHTSA), a U.S. government agency. NHTSA does not verify individual complaints; a complaint is not proof that a defect exists, and counts reflect what owners chose to report, not confirmed failure rates. Recall information comes from official NHTSA safety recall campaigns; recall repairs are free at authorized dealers. Always check your specific vehicle by VIN at nhtsa.gov/recalls. CarModelProblems.com is an independent site and is not affiliated with NHTSA or any vehicle manufacturer. Data through 07/12/2026.