The contact owns a 2019 Mercedes-Benz GLA250. The contact stated that while driving at approximately 70 MPH, several unknown warnings illuminated on the instrument cluster. The contact stated that upon depressing the accelerator pedal, the vehicle failed to respond while the engine revved. The contact pulled over to the side of the road and turned the vehicle off. Upon restarting the vehicle, no…
2019 Mercedes-Benz CLA-Class powertrain problems
severe 13 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Complaints
13
Recalls
0
Avg fix
$2,500
1crash
1injury
When does it fail?
Of the 13 powertrain complaints filed for the 2019 Mercedes-Benz CLA-Class, here's the actual mileage breakdown — failures cluster heaviest at 125,000-150,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Among the 6 model years of Mercedes-Benz CLA-Class in our records for powertrain problems, this one ranks #3 by owner-complaint volume.
Powertrain accounts for 25% of all owner complaints filed against this vehicle, across 8 categories tracked.
The failure pattern owners describe
Buyer takeaway: Owners report transmission repeatedly shifting into neutral without warning at highway speeds, sometimes causing stalls and loss of control—a serious safety issue that dealers often cannot duplicate or permanently fix. Rear differential problems also surface early, with dealerships offering temporary fluid flushes that eventually require expensive full replacement out of warranty.
Owners of 2019 Mercedes-Benz GLA-Class vehicles describe a pattern of transmission suddenly shifting into neutral at various speeds (25 to 70 MPH) without input from the driver, causing immediate loss of power and sometimes engine stall. The vehicle must be turned off and restarted to regain drive; the problem occurs intermittently and repeatedly during single trips. Dashboard warnings include "See Dealer," "Reversing Not Possible Service Required," and transmission error messages; check engine lights typically illuminate. Most owners relate this to NHTSA Campaign 21V033000 (Power Train), though multiple report their VINs were excluded from the recall despite matching symptoms. Dealers frequently cannot duplicate the failure and sometimes only reset the check engine light without repair.
Rear differential issues also appear early—noises, fluid loss, and hardware fractures reported between 55,000 and 75,000 miles. Dealerships perform temporary fixes (fluid flush and change) under warranty but openly tell owners the differential will eventually fail and require full replacement at owner expense. One owner reports a collision when the vehicle shifted from park to reverse at low speed with the driver attempting the opposite input, injuring the driver and totaling the vehicle. A separate complaint describes brake knock and brake pedal pulsation coupled with the neutral-shift problem on a nearly-new vehicle with ongoing electrical issues.
Failure modes owners describe
Transmission shifts into neutral at highway speeds
Transmission inadvertently shifts to neutral while driving, causing loss of motive power and engine stall. Vehicle must be turned off and restarted to regain drive. Occurs intermittently at various speeds (25 MPH to 70 MPH). Check engine light often illuminates with 'See Dealer' or 'Reversing Not Possible Service Required' messages.
When: Occurs from 29,775 miles through 145,495 miles; reported as early as 11,000 miles in one case
Symptoms owners cite: Transmission shifts to neutral without driver input; Loss of drive power; Vehicle stalls; Check engine light illuminates; Dashboard warnings: 'See Dealer', 'Reversing Not Possible Service Required', 'Pull Over Contact Service Immediately'; Transmission error messages displayed; Intermittent, repeats multiple times during single drive
Codes mentioned: 21V033000, 21V033, 2021020038
Repairs/costs cited: Dealers unable to consistently duplicate failure. One owner mentions transmission control unit replacement (Campaign No. 2021020038, Part 21P5495403). Some dealers reset check engine light without repair. Vehicle restarted to regain function; no permanent repair reported in most cases.
Recalls/TSBs owners mention: NHTSA Campaign 21V033000 (Power Train) referenced by owners; however, multiple owners report their VINs were not included in recall. Manufacturer referred owners to dealers or NHTSA Hotline. One owner reports manufacturer stated no recall associated with VIN despite matching campaign number symptoms.
Rear differential failure
Rear differential develops problems requiring service. In one case, dealership diagnosed fractured differential. In another, dealership recommended fluid flush and change as temporary measure, advising eventual replacement will be necessary. Owner reports dealership acknowledged differential failure would recur after warranty expires, requiring full replacement at owner expense.
When: One case at 55,000 miles; another at 75,000 miles; one case after December 2023 fix re-failed in July 2024
Symptoms owners cite: Noise from rear differential; Check engine light; Repeated failures after warranty service
Repairs/costs cited: Dealership fluid flush and change performed under warranty as temporary fix (December 2023 case). Owner advised full differential replacement is only permanent solution. Fractured differential diagnosed at another dealership; vehicle not repaired due to cost. Fluid service costs not specified; full replacement cost not quoted in narratives.
Recalls/TSBs owners mention: One owner reports dealership and manufacturer conducted warranty repair (fluid service) but acknowledged this is temporary measure and full replacement will eventually be needed at owner cost. Manufacturer referred contact to NHTSA Hotline. Software upgrade mentioned in one narrative as attempted fix.
Transmission only able to operate in reverse
Transmission operates only in reverse gear; unable to shift into other gears. Dealer advised repair would take weeks.
When: Reported in one 2019 GLA 45; exact mileage not stated
Symptoms owners cite: Vehicle only operates in reverse; Cannot shift into drive or other gears
Repairs/costs cited: Dealer stated transmission is cause and repair would require weeks to complete. Vehicle not repaired at time of complaint.
Brake system failure with transmission shift to neutral
Vehicle exhibited brake knock and brake pedal pulsation on first stop, followed by transmission shifting to neutral on second use within blocks of driving. At 29,775 miles on new vehicle, owner reports dangerous condition with electrical issues from beginning of ownership.
When: 29,775 miles (new vehicle)
Symptoms owners cite: Knocking noise in brakes; Brake pedal jumped up and down on first stop; Transmission shifted to neutral without input; Loss of drive power; Dashboard warning: 'Pull Over Contact Service Immediately'; Dashboard warning: 'Reversing Not Possible Service Required'; Intermittent electrical problems
Repairs/costs cited: Vehicle was not repaired. Owner reports multiple reports to dealership (3-4 times) without resolution.
Unintended shift from park to reverse causing collision
While stopped and attempting to shift to park, vehicle instead shifted into reverse, causing driver to collide with unknown object. Vehicle then shifted into drive and collided with truck. Side airbags deployed but steering wheel airbag did not. Driver sustained chest bruising requiring medical attention. Vehicle deemed total loss by insurance.
When: 11,000 miles
Symptoms owners cite: Unintended shift from park to reverse; Unintended shift from reverse to drive; Complete loss of shifter control; Side airbags deployed; Steering wheel airbag did not deploy
Repairs/costs cited: Vehicle totaled; no repair attempted.
Recalls/TSBs owners mention: Manufacturer made aware of failure.
Synthesized from 13 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
I was driving my vehicle and it shifted into neutral and would not go back into gear until I pulled over to side of the road, turned it off and back on. A check engine light came on when I restarted the vehicle and I took the vehicle to the dealership for diagnosis. They told me they couldn't find an issue and reset the check engine light. A week later, I was driving on the freeway and it…
The contact owns a 2019 Mercedes-Benz GLA250. The contact stated that while his wife was driving 25 MPH, the transmission inadvertently shifted into neutral(N). The Reverse Inoperative message was displayed. The contact's wife turned off and restarted the vehicle before driving to the residence. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was…
The vehicle with only 29,775 miles on it, and I bought it new, made a knocking noise in the brakes and the brake pedal jumped up and down at first stop sign when I left my house. I reapplied the brake to see if it would work. It did. I turned onto the highway and within two blocks the vehicle shifted itself into N, a message on dashboard said pull over, contact service immediately. I was able to…
Had powertrain trouble with your 2019 Mercedes-Benz CLA-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 powertrain problem on the 2019 Mercedes-Benz CLA-Class?
It's a meaningful issue. 13 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Based on the 13 complaints filed, powertrain issues most often appear around 57,583 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 $2,500 for powertrain 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 powertrain?
No active recalls currently cover powertrain 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/2019/Mercedes-Benz/CLA-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.