2018 Mercedes-Benz CLA-Class problems
Light NHTSA footprint — 44 owner complaints. Either a clean record or thin data; we'll show what's there.
The 2018 Mercedes-Benz CLA-Class has 44 NHTSA owner complaints on file (U.S. federal records, as of August 2026). The most-reported system is electrical at 11 complaints, typically surfacing around 3,274 miles (~$850 to repair). Source: NHTSA Office of Defects Investigation.
| Model year | Owner complaints | Recalls |
|---|---|---|
| 2015 CLA-Class | 157 | 0 |
| 2016 CLA-Class | 65 | 0 |
| 2017 CLA-Class | 27 | 0 |
| 2018 CLA-Class (this page) | 44 | 0 |
| 2019 CLA-Class | 51 | 0 |
| 2020 CLA-Class | 23 | 0 |
| 2021 CLA-Class | 5 | 0 |
Solid reliability overall. Common issues are concentrated in a few systems.
Buyable on the data — keep up the usual maintenance and inspect normally.
- No systemic severe-failure pattern in the complaint record
- Reliability score 8.2/10 — above the segment average
Our read of the federal NHTSA complaint and recall record for this exact year and model — not a substitute for a pre-purchase inspection. How we score.
Buying a used 2018 Mercedes-Benz CLA-Class? Check these first
Here's what this model is known to do — so you can inspect for it, price it in, or make the seller fix it before you sign.
What to inspect on this specific car
- electrical — 11 owner reports · tends to show around 3,274 mi · ~$850 to fix
- airbags — 6 owner reports · tends to show around 42,730 mi · ~$1,100 to fix
- body — 6 owner reports · tends to show around 61,050 mi · ~$1,500 to fix
- engine — 5 owner reports · tends to show around 59,973 mi · ~$3,100 to fix
⚠ The one to take seriously: electrical is flagged severe on this model , showing up around 3,274 mi. Inspect it closely on a test drive.
Recalls to confirm are done
Run the VIN from the listing — no active recalls on this model right now, but confirm none were opened after this car was built.
Verdict for buyers: 8.2/10 model. The priciest documented failure is engine (~$3,100) — get the seller's service records for it or inspect closely. Otherwise an average-risk used buy at a fair price.
We tell you what this model is known for and what to inspect — a vehicle-history report tells you what this exact car has been through. Smart buyers get both.
See the full pre-purchase inspection checklist →Ask anything about your 2018 Mercedes-Benz CLA-Class
A noise, a warning light, a repair quote, "should I buy this?" — get an answer grounded in this vehicle's actual NHTSA record, not generic advice.
Answers use this vehicle's NHTSA complaint & recall record — owner-reported and unverified, not a diagnosis. Verify anything safety-critical with a mechanic.
Top trouble spots 5 categories with 3+ complaints
What owners are saying recent NHTSA-filed complaints · verbatim
roof front panel coating peeling off - there has been a recall for this issue on most mercedes benz of my year - not just my model- seems to consistently be an issue for the front panel between windshield and sunroof- [XXX] my specific VIN wasnt included in the recall but i am…
Water comes in the car and fills the back seat floors with water. I think its comming in from the frame.
Check engine code PO52E - Positive Crankcase Ventilation regulator valve performance. Needs to be recalled
I have sent the below email over 100 times to Mercedes To whom it may concern, I am writing regarding the purchase of a CLA250 4matic in December. I had a 120 point inspection done that did not show any issues with this car. As I was driving down a dark road around 1 am, my…
Estimate your repair exposure
Drag to your current mileage. Numbers are derived from this vehicle's complaint history.
Common questions
Is the 2018 Mercedes-Benz CLA-Class reliable?
Mostly yes. With a reliability score of 8.2 out of 10 based on 44 owner complaints filed with NHTSA, the 2018 Mercedes-Benz CLA-Class is generally a sound vehicle. The areas to watch are listed in the top problem section above — most are budget items, not deal-breakers.
Should you avoid the 2018 Mercedes-Benz CLA-Class?
On the NHTSA data, the 2018 Mercedes-Benz CLA-Class does not need avoiding. Buyable on the data — keep up the usual maintenance and inspect normally. The record behind that call: No systemic severe-failure pattern in the complaint record; Reliability score 8.2/10 — above the segment average. This is our read of the federal complaint and recall data — not a substitute for a pre-purchase inspection.
What should I check before buying a used 2018 Mercedes-Benz CLA-Class?
Inspect the electrical first — it's the most-reported issue on this model, with 11 owner complaints filed. Typical failure occurs around 3,274 miles. Average repair cost runs about $850 at an independent shop. Also confirm any open recalls have been completed by running the VIN, and ask for service records covering the problem areas listed above.
Is the 2018 Mercedes-Benz CLA-Class a good used car to buy?
It scores 8.2 out of 10 on our NHTSA-based read of 44 owner complaints. The main thing to watch is electrical. Typical failure occurs around 3,274 miles. Priced fairly and clean on inspection, it's a reasonable used buy. Our data covers what this model is known for — pair it with a vehicle-history report on the VIN to see what that specific car has been through.
What's the most common problem on the 2018 Mercedes-Benz CLA-Class?
Based on NHTSA records, the most-reported issue is electrical, with 11 complaints filed. Typical failure occurs around 3,274 miles. Average repair cost runs about $850 at an independent shop.
What's the most expensive thing that goes wrong?
The electrical is one of the costlier repair items. Average repair cost runs about $850 at an independent shop. Typical failure occurs around 3,274 miles. Catching early warning signs can sometimes extend life by 20–30,000 miles.
How do I check if my Mercedes-Benz CLA-Class has open recalls?
Paste your VIN into the decoder at the top of this page. We pull live from NHTSA, so you'll see exactly which campaigns apply to your vehicle and whether the dealer has logged the fix. Recall repairs are always free regardless of mileage or warranty status.
Is an extended warranty worth it on a 2018 Mercedes-Benz CLA-Class?
Math is straightforward: a quality service contract runs $1,800–3,500 over 3 years. With 44 complaints on file and the costliest repair averaging $850, one major failure more than pays for it. The catch is reading the contract — many providers exclude wear items and require pre-authorization, so cheaper plans are not always better value.