Lane departure system stopped working and the engine stalled on the highway. Problem reproduced by dealer who has the car now.
2016 Mercedes-Benz GLA-Class engine problems
moderate 12 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Complaints
12
Recalls
0
Avg fix
$3,100
What stands out
Engine accounts for 24% of all owner complaints filed against this vehicle, across 6 categories tracked.
No new NHTSA engine complaint has been filed on this vehicle in over 4 years — the issue may be aging out of the active population.
The failure pattern owners describe
Owners of the 2016 Mercedes-Benz GLA report engine shutdowns and stalling that occur without warning while driving. Most critical are incidents on highways and during traffic stops; one owner nearly was struck during a shutdown on I-93 during rush hour. The engine cuts off completely, sometimes leaving the vehicle stuck in neutral or unable to shift gears until restart.
Diagnostics point to a crankcase ventilation system failure flagged by code P052E or P052E-71, where the ventilation valve actuator becomes blocked and fuel begins mixing with engine oil. Owners have documented this as a known defect on multiple Mercedes models, with the manufacturer providing service bulletins and extended warranty coverage (up to 150,000 miles) on some models. However, Mercedes-Benz is refusing coverage on GLA vehicles despite identical symptoms.
Repair costs run $2,000–$2,500 for valve or oil separator replacement. Several owners report the defect recurs within 1–2 years after repair. A related fuel system issue involving fuel leaks and injector problems is also reported, with some owners excluded from recalls despite matching the defect description. One owner noted strong gasoline vapor when accessing the engine and was told by a Mercedes dealer this is "common" on some 4-cylinder engines.
Failure modes owners describe
Unplanned engine shutdown/stalling while driving
Engine cuts off completely while in motion, sometimes during highway driving or at low speed (traffic stops, 15-55 mph). Vehicle loses power without warning and may enter neutral. Shifting gears becomes difficult or impossible after restart.
When: Various mileages from 3,800 to 88,180; incidents reported from 2018-2024
Symptoms owners cite: engine shuts off abruptly while driving; vehicle enters neutral or resists gear shift; screen/display blacks out then restarts; occurs during highway driving and at traffic stops
Codes mentioned: P052E, P052E-71
Repairs/costs cited: Dealer estimates $2,000–$2,500 for crankcase ventilation valve/oil separator replacement; owner reports repeat failures within 1–2 years after replacement
Crankcase ventilation system malfunction (P052E/P052E-71)
Crankcase ventilation valve fails, blocking the actuator. Fuel and oil begin to mix inside the engine. Check engine light illuminates. Owners report this is a known defect on multiple Mercedes models covered under service bulletins and extended warranties to 150,000 miles, but Mercedes-Benz has refused coverage on GLA models despite widespread documentation.
When: 92,000–88,180 miles documented; appears early as 63,000 miles
Symptoms owners cite: check engine light; fuel and oil mixing inside engine; valve fails to close properly
Codes mentioned: P052E, P052E-71
Repairs/costs cited: Oil separator or crankcase ventilation valve replacement; $2,000–$2,500 quoted; failure repeats 1–2 years after repair
Recalls/TSBs owners mention: Mercedes-Benz has issued service bulletins and extended warranty coverage (up to 150,000 miles) for other models; GLA owners report denial of coverage despite identical failures
Fuel system malfunction (fuel leak, fuel injector/rail issues)
Fuel leak prevents fuel injectors and fuel rail from receiving proper fuel injection. Vehicle experiences repeated stalling. Owners cite a manufacturer recall for their make, model, and year, but some VINs are excluded despite presenting the identical defect.
When: Failure timing not explicitly stated; vehicle has experienced repeated stalling
Symptoms owners cite: repeated stalling; fuel leak; improper fuel delivery to injectors and rail
Recalls/TSBs owners mention: Manufacturer recall exists but VIN exclusion prevents coverage on some vehicles with identical symptoms
Engine vibration and rumbling noise with performance seizure
Vehicle vibrates and rumbles under the hood at 30–54 mph. At 1,400 RPM/55 mph, engine failure seizes completely. Vibration felt through steering wheel and accelerator pedal.
When: 3,800 miles
Symptoms owners cite: vibration under hood; rumbling noise; engine seizure at 1,400 RPM; vibration through steering wheel and accelerator pedal
Repairs/costs cited: Dealer could not determine cause; vehicle not repaired
Recalls/TSBs owners mention: Manufacturer was notified
Strong gasoline vapor in engine/crankcase ventilation odor
Strong gasoline vapor present when checking oil or removing oil filler cap. Owner fears potential explosion during service. Mercedes dealer acknowledges this is common on some 4-cylinder engines.
When: Ongoing
Symptoms owners cite: strong gasoline vapor when accessing engine; vapor from oil filler cap
Recalls/TSBs owners mention: Mercedes dealer acknowledges condition is common on some 4-cylinder engines
Lane departure system failure with concurrent engine stall
Lane departure warning system stops functioning while engine stalls on the highway. Issue has been reproduced by dealer.
When: <UNKNOWN>
Symptoms owners cite: lane departure system malfunction; engine stall on highway
Repairs/costs cited: Dealer has vehicle for diagnosis
Synthesized from 12 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
I was driving on the highway and when I stopped because there was traffic my car completely cut off. Screen and display went back and then it came back on and went into neutral and when I went to shift gears and try to change into drive it would not allow me to change gears. I had to turn the car off and turn it back on. THIS WAS ON THE HIGHWAY!!! This happened 2 times on my way home. I have…
Had engine trouble with your 2016 Mercedes-Benz GLA-Class?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2016 Mercedes-Benz GLA-Class?
It's a documented issue but not catastrophic. 12 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Based on the 12 complaints filed, engine issues most often appear around 47,495 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2016/Mercedes-Benz/GLA-Class.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.