Mercedes-Benz C-Class check engine light problems: what 231 owners reported

Owners filed 231 NHTSA complaints about the check engine light on the Mercedes-Benz C-Class. That is 8.2% of the 2,820 complaints on record for the model. Reports cover model years 2012 to 2024, and the most come from 2015 (46) and 2016 (47). The light is a warning, not a diagnosis: owners linked it to very different things, from a fault code on an emissions part to loss of power and, in a few cases, complete engine failure.

NHTSA's recall data for these model years has no recall matching this problem as of October 2026. If this is not your case, read the full Mercedes-Benz C-Class problem report.

TL;DR

• 231 complaints mention the check engine light, 8.2% of 2,820 C-Class complaints.
• The most reports come from model years 2016 (47), 2015 (46) and 2017 (32).
• 165 of the reports name the engine, 50 the fuel or propulsion system, 25 the power train and 15 the electrical system.
• Several owners name fault code P052E; others name a camshaft position sensor, misfires or the high-pressure fuel pump.
• No crash is mentioned, one report mentions a fire, and the reports list 1 injury in total.
• No recall matching this problem was found in NHTSA data for these years.

Which Mercedes-Benz C-Class years have the most check engine light complaints?

The 2015 and 2016 cars stand out on raw numbers: together they account for 93 of the 231 reports. In share terms the light matters more for 2015 to 2019 cars, where it is 10.2% to 15.2% of all complaints for the year. The 2012 and 2013 cars have more reports than 2014, but they also have far more complaints overall, so the light is a smaller part of their story (4.8% and 4.2%). The newest years have only a handful of reports because those cars have had less time on the road. The 2025 and 2026 model years have none yet.

What do C-Class owners describe?

The reports are owner descriptions, not workshop findings, so treat the causes they mention as their own account.

A specific fault code. P052E is named in three of the reports quoted here, from 2015, 2017 and 2018 cars. One 2015 owner wrote: "Check Engine light came on recently, fault code P052E is identified by scanner. Car has 60,000 miles on original it. MB dealer wants to charge $300 for diagnostics, repair job (parts and labor) may cost over $2,000" (NHTSA complaint 11669468). A 2017 owner described the light "coming and going off for years now" before it stayed on, and said the dealer quoted $850 (complaint 11725960). A 2018 owner called it "a known defective part by Benz" (complaint 11709871). I cannot verify those claims, and none of them is a manufacturer statement.

Loss of power. A 2012 owner wrote: "The vehicle performs normally until there is hard acceleration; then the engine light comes on. This causes the car to lose acceleration power" and blamed the high-pressure fuel pump (complaint 11600868). A 2022 owner reported that the car "fails to accelerate past 25 mph when entering roadway" and that the "Engine light came on after incident" (complaint 11745068).

Rough running and misfires. A 2013 owner described that "the car began running rough and showing hesitation," with a scan showing a camshaft position sensor fault and a cylinder misfire (complaint 11697039). A 2014 owner reported a start-up noise, then a car that would not start, with the check engine light "indicate a cam shaft position sensor error" (complaint 11672484).

Engine failure. A 2019 owner wrote that "the vehicle suddenly shut off and stalled" at an intersection, after the check engine light came on with "severe shaking and misfires" (complaint 11766013). A 2016 owner reported that the light came on "without any prior warning" and the engine failed within minutes (complaint 11739458). These are the most serious accounts, and they are a small part of the 231.

Sensors and wiring. A 2021 owner reported a pressure sensor fault code and wrote: "Found Kink wire on upstream pressure sensor... Electrical Wire replaced" (complaint 11579561).

Across all 231 reports, the components named are Engine (165), Fuel/Propulsion System (50), Power Train (25), Electrical System (15), Fuel System (10) and Gasoline (10). One report mentions a fire, none mentions a crash, and the reports list 1 injury in total.

Is there a recall for the check engine light on the C-Class?

NHTSA's recall data for these model years has no recall matching this problem as of the date of this guide. Several owners above say they expect a recall or believe one exists, but I found nothing in the data to confirm that. A recall for another part may still apply to your car, so check your own VIN rather than relying on this page.

You can look up open recalls by VIN on the NHTSA recalls page or on Mercedes-Benz USA's recall information page. See also the C-Class problem report for recalls on other parts.

What should you do if your C-Class check engine light comes on?

Here is what I would do, using only sources that anyone can check:

1. Check how the car drives. If the light is steady and the car drives normally, get it checked soon. If the car loses power, shakes badly or stalls, stop driving when it is safe and call for help. One owner above was left stranded in traffic.
2. Write down the details. Note the date, mileage, any warning messages, and the conditions (cold start, hard acceleration, highway). If a scanner or dealer gives you a fault code, write it down exactly.
3. Check open recalls by VIN at nhtsa.gov/recalls.
4. Ask the dealer to check for open recalls and manufacturer service bulletins for your VIN before agreeing to a repair, and ask for the diagnosis in writing.
5. Report the problem at nhtsa.gov/report-a-safety-problem. Your report adds to the public record for your model year.

If you are buying a used C-Class, look at the report for the exact model year first, for example the 2015 or 2016 page, and ask the seller whether the light has ever been on.

How this guide was made

The numbers come from owner complaints filed with NHTSA. A complaint counts here when its own text describes the check engine light coming on, so a report can be about the light as a symptom of many different problems. Data as of 27 October 2026. Details are on the methodology page.