I was travelling on highway with adaptive cruise control on. When near the exit, I press the off button for the cruise control. To my surprise, the car didn't slow down, and instead maintain the engine power to keep the car in set speed. I tried the other settings (off, cancel, speed down) option but nothing is responsive. Since I am on the off ramp already, I have to step on the brake (this…
2020 Mercedes-Benz GLE-Class cruise control problems
moderate 10 complaints filed with NHTSA · avg repair $600 · see cruise control across all vehicles →
Complaints
10
Recalls
0
Avg fix
$600
When does it fail?
Of the 10 cruise control complaints filed for the 2020 Mercedes-Benz GLE-Class, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 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
No new NHTSA cruise control complaint has been filed on this vehicle in over 5 years — the issue may be aging out of the active population.
The failure pattern owners describe
Buyer takeaway: Several 2020 GLE-Class owners report cruise control malfunctions including unresponsive controls, erroneous speed limit readings, arbitrary speed changes, and harsh braking that create highway safety risks. A 48V battery overheating issue has also caused complete power loss on freeways.
The 2020 GLE-Class has a pattern of cruise control problems that go beyond minor annoyances. Owners report the adaptive cruise control either stops responding to button inputs altogether—forcing emergency brake application—or misreads speed limit signs and accelerates to dangerous speeds. One owner's camera system confused kilometer signs for mph signs, causing sudden acceleration from 45 to 80 mph in traffic.
Equally troubling, the cruise control arbitrarily drops speed from 70 to 45 mph without driver input, even with sign recognition turned off. This has caused near rear-end collisions. The system also brakes hard when it spots exit ramp signs or falsely detects obstacles like guard rails on the opposite side of the road, creating rear-end collision hazards.
Beyond cruise control, owners describe harsh, clunky transmission behavior with the Auto Start/Stop 48V system at low speeds, making parking unpredictable. More critically, several owners experienced complete power loss on freeways linked to 48V battery overheating—a known issue Mercedes issued a bulletin for, though not all affected vehicles were recalled. Dealership inspections frequently find no replicable fault, leaving owners without solutions.
Failure modes owners describe
Cruise control unresponsive to manual disengagement
Adaptive cruise control fails to respond to OFF button presses and other control inputs (CANCEL, SPEED DOWN). Owner must apply brake pedal to force deceleration.
When: Highway driving
Symptoms owners cite: OFF button does not deactivate cruise control; Vehicle maintains set speed despite control inputs; Cruise control indicator remains active on dash despite system malfunction; Multiple warning messages appear: 'ADAPTIVE CRUISE CONTROL INOPERATIVE', 'ACTIVE LANE KEEP ASSIST INOPERATIVE'
Repairs/costs cited: Dealership inspection found no issue; camera condensation was present and cleared by dealer, then reappeared
Speed limit sign misreading with erroneous acceleration
Cruise control with speed-sign recognition feature misreads speed limit signs and accelerates to dangerous speeds. Camera system confuses kilometer signs for mph signs, causing unintended rapid acceleration.
When: While driving on road with posted speed limits
Symptoms owners cite: Cruise control automatically resets to incorrect higher speed (set to 45 mph, accelerates to 70 mph or higher); Dashboard displays wrong speed limit reading; Vehicle rapidly accelerates past intended set speed; Sign recognition feature misinterprets kilometer signs as mph signs
Recalls/TSBs owners mention: Driver notes vehicle has Mercedes Driver Assistance Package
Arbitrary cruise control speed reduction during cruise
Cruise control changes set speed from 70 mph to 45 mph without driver input or visible trigger, applying brakes to reduce speed. Occurs repeatedly even with speed-sign recognition feature disabled.
When: Long highway driving (900-mile trip); occurred at least 12 times over trip
Symptoms owners cite: Set speed changes from 70 mph to 45 mph without driver action; Brakes apply automatically during speed reduction; Occurs with sign recognition feature turned off; No identifiable cause or trigger
Repairs/costs cited: Dealer states no malfunction found
Harsh/clunky transmission behavior with Auto Start/Stop
Auto Start/Stop 48V system causes jerky, unsmooth transmission engagement at low speeds. Vehicle surges or lurches forward abruptly when system engages and disengages, making parking maneuvers unsafe and unpredictable.
When: Low-speed driving, parking, parallel parking situations
Symptoms owners cite: Transmission feels clunky and not smooth; Vehicle surges or lurches forward uncontrollably; Unpredictable jerking during engagement/disengagement of Auto Start/Stop; Makes garage parking and parallel parking unsafe
Recalls/TSBs owners mention: Auto Start/Stop 48V system enabled by default for reduced emissions
48V battery overheating with complete power loss
48V battery overheats causing total loss of vehicle power and all control functions while driving. Related to known issue with GLE 450 models; owner's vehicle was not included in recent recall despite exhibiting same symptoms.
When: While driving on freeway
Symptoms owners cite: Battery warning light cycles on and off; Bright red battery light appears on dashboard; Complete loss of vehicle power and all functions; Overheating message appears; Vehicle limp-home capability reduced to 10 mph on separate incident
Codes mentioned: 48V battery malfunction message, Coolant not working/overheating message
Repairs/costs cited: One owner could only drive 10 mph after power loss; nearly rear-ended by semi truck
Recalls/TSBs owners mention: Mercedes aware of technical bulletin regarding this issue; some vehicles recalled but not all affected units
Adaptive cruise erroneous braking on exit ramps and false obstacles
Adaptive cruise control reads exit ramp speed limit signs and brakes hard as if approaching hazard, creating rear-end collision risk. Also brakes for false obstacles like vegetation or guard rails on opposite side of road during turns.
When: Interstate driving during lane transitions and turns
Symptoms owners cite: Hard braking when approaching exit ramp (camera reads exit speed limit); Braking for obstacles on opposite side of road during turns; False collision avoidance activation when no hazard exists; Multiple occurrences of both behaviors
Throttle unresponsiveness during acceleration
Accelerator pedal becomes unresponsive despite being fully depressed. No engine response to throttle input; issue resolves after shifting transmission to Park and back to Drive.
When: During acceleration from stop at busy intersection
Symptoms owners cite: No throttle response despite depressing gas pedal; No engine noise when pedal is pressed; 3-4 second delay before vehicle accelerates; Hard transmission 'clunk' when coming to stop
Repairs/costs cited: Dealership unable to replicate issue; vehicle returned with 'non replicable' notation
Harsh adaptive cruise braking in stop-and-go traffic
Adaptive cruise control applies braking in jarring, unnatural manner during stop-and-go traffic. Braking is harsh and abrupt rather than smooth, creating concern for rear-end collision risk.
When: Stop-and-go traffic conditions
Symptoms owners cite: Jarring, harsh braking feel; Unnatural braking behavior compared to normal driving; Abrupt deceleration rather than smooth braking; Multiple owners report same issue
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Had cruise control trouble with your 2020 Mercedes-Benz GLE-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 cruise control problem on the 2020 Mercedes-Benz GLE-Class?
It's a documented issue but not catastrophic. 10 complaints have been filed. Repairs average $600 and most owners catch it before it causes a breakdown.
At what mileage does the cruise control typically fail?
Based on the 10 complaints filed, cruise control issues most often appear around 2,942 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 $600 for cruise control 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 cruise control?
No active recalls currently cover cruise control 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/2020/Mercedes-Benz/GLE-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.