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moderate Owners of the 2018 Acura MDX have filed 11 NHTSA complaints about the fuel system at roughly $1,200 to repair (U.S. federal records, as of August 2026). Source: NHTSA Office of Defects Investigation. See fuel system across all vehicles →
| Model year | fuel system complaints |
|---|---|
| 2016 MDX | 4 |
| 2018 MDX (this page) | 11 |
| 2019 MDX | 8 |
| 2020 MDX | 4 |
Of the 11 fuel system complaints filed for the 2018 Acura MDX, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 mi.
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.
Of the 5 model years of Acura MDX we track for fuel system problems, this one carries the most owner complaints on file — 11.
All 2 active fuel system recalls on this vehicle land at critical or severe — none classified moderate.
Reduced fuel pump performance can result in an engine stall, increasing the risk of crash.
Fuel pump failure can cause an engine stall while driving, increasing the risk of a crash.
The manufacturer has issued service bulletins covering fuel system on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Service Bulletin - Due to variations in the purge control solenoid valve spring, the valve wears unevenly and intermittently sticks. This may result in setting DTC P0441 (Evaporative Emission (EVAP) System Purge Flow Malfunction).
full bulletin at NHTSA ↗American Honda Motor Co., Inc. (AHM) is searching for certain 2016-2020 MDXs, RLXs & TLXs with a client complaint of the Malfunction Indicator Light (MIL) on with the DTC P030X (Cylinder Misfire Detected), P0171 & P0174 (Rear/Front Bank Fuel System Too Lean), or P219A&B (Air-Fuel Ratio Variation of Cylinder) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
full bulletin at NHTSA ↗Dealer message - American Honda Motor Co., Inc. (AHM) is searching for certain 2016-2020 MDXs, RDXs & TLXs with a client complaint of the Malfunction Indicator Light (MIL) on with the DTC P030X (Cylinder Misfire Detected), P0171 & P0174 (Rear/Front Bank Fuel System Too Lean), or P219A&B (Air-Fuel Ratio Variation of Cylinder) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
full bulletin at NHTSA ↗Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2016-2020 MDXs, RDXs & TLXs with a client complaint of the Malfunction Indicator Light (MIL) on with the DTC P030X (Cylinder Misfire Detected), P0171 & P0174 (Rear/Front Bank Fuel System Too Lean), or P219A&B (Air-Fuel Ratio Variation of Cylinder) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
full bulletin at NHTSA ↗Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2016-2020 MDXs, RDXs & TLXs with a client complaint of the Malfunction Indicator Light (MIL) on with the DTC P030X (Cylinder Misfire Detected), P0171 & P0174 (Rear/Front Bank Fuel System Too Lean), or P219A&B (Air-Fuel Ratio Variation of Cylinder) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
Owners of the 2018 Acura MDX report multiple fuel-system complaints across this cluster of 11 cases. The most serious involve fuel pump failure causing complete loss of engine power and stalling at highway speeds (45–75 MPH), with some vehicles unable to restart without a tow. One owner at 40,000 miles had the fuel pump replaced at a dealer but the stalling persisted; dealers then diagnosed transmission failure and said the vehicle exceeded warranty mileage.
A second owner at 100,500 miles experienced loud vibrating noise; Acura performed recall 23V858000 (Fuel System, Gasoline) on the vehicle, but the noise continued. An independent mechanic suggested a secondary fuel pump not covered by the recall was the culprit, yet the manufacturer offered no further assistance.
An owner at 50,000 miles reported unintended acceleration (sudden lunge forward) with warning lights, diagnosed as a faulty fuel system.
Intermittent engine hesitation while driving was reported at 87,000 miles on a vehicle awaiting the fuel system recall repair.
The remaining six complaints (24V-4, 5, 6, 8, 10) document that Acura's recall parts have been unavailable for extended periods, preventing repairs on vehicles that received recall notices but cannot be serviced.
Multiple fuel pump failures reported across different vehicles. In complaint #1, the fuel pump was replaced but the loss-of-power condition persisted. In complaint #2, an independent mechanic diagnosed a second fuel pump (not covered by the recall) as likely the cause of a loud vibrating noise.
When: 40,000 miles (#1); 100,500 miles (#2)
Symptoms owners cite: Loss of motive power and stalling (#1); Unable to restart the vehicle (#1); Loud vibrating noise from vehicle (#2)
Repairs/costs cited: Fuel pump replaced (#1, #2) but failure persisted; dual fuel pump configuration suspected with secondary pump not covered by recall (#2)
Recalls/TSBs owners mention: NHTSA Campaign Number: 23V858000 (Fuel System, Gasoline); VIN #1 not included in campaign; recall repair performed #2 but did not resolve issue; parts unavailable for repair in complaints #3–#10
Complaint #1 involved diagnosis of an oil pressure switch failure when the vehicle stalled at 45 MPH. The switch was replaced but the loss-of-power condition persisted, suggesting either a misdiagnosis or a related fuel-system root cause.
When: 40,000 miles
Symptoms owners cite: Loss of motive power and stalling at 45 MPH; Multiple unknown warning lights and traction control light illuminated
Repairs/costs cited: Oil pressure switch replaced but failure persisted
Recalls/TSBs owners mention: NHTSA Campaign Number: 23V858000 (Fuel System, Gasoline); VIN not included in campaign
Complaint #3 reports intermittent engine hesitation while driving on a vehicle that was pending the fuel system recall repair. No diagnosis or repair was performed because the recall part was unavailable.
When: 87,000 miles
Symptoms owners cite: Intermittent engine hesitation while driving
Repairs/costs cited: Vehicle not diagnosed or repaired; recall part unavailable
Recalls/TSBs owners mention: NHTSA Campaign Number: 23V858000 (Fuel System, Gasoline); part not yet available; manufacturer exceeded reasonable repair timeline
Complaint #1 describes unintended deceleration (70–75 MPH dropping to 40–45 MPH) during driving, with acceleration requiring pedal pumping and producing a crunching sound. Later diagnosed as transmission failure, but whether the fuel-system issue was primary or secondary is unclear from the narrative.
When: 40,000 miles
Symptoms owners cite: Unintended deceleration from 70–75 MPH to 40–45 MPH; Crunching sound when accelerating; Remote start failure (intermittent)
Repairs/costs cited: Transmission failure diagnosed by certified mechanic; transmission replacement needed but not performed; vehicle exceeded mileage for warranty transmission repair
Recalls/TSBs owners mention: Manufacturer opened a case; vehicle not repaired
Complaint #9 reports an unintended lunge forward when the accelerator pedal was depressed, accompanied by multiple unknown warning lights. Diagnosed by an independent mechanic as a faulty fuel system.
When: 50,000 miles
Symptoms owners cite: Vehicle lunged forward when accelerator pedal was depressed; Multiple unknown warning lights illuminated
Repairs/costs cited: Diagnosed with faulty fuel system by independent mechanic; repair status not stated
Recalls/TSBs owners mention: Manufacturer made aware of failure; no resolution stated
Synthesized from 11 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
The contact owns a 2018 Acura MDX. The contact stated while driving at various speeds, there was a loud vibrating noise coming from the vehicle. There was no warning light illuminated. The contact had received notification of NHTSA Campaign Number: 23V85800 (FUEL SYSTEM, GASOLINE); and the vehicle was taken to the dealer where the recall repair was performed; however, the failure persisted. The…
It's a documented issue but not catastrophic. 11 complaints have been filed. Repairs average $1,200 and most owners catch it before it causes a breakdown.
Based on the 11 complaints filed, fuel system issues most often appear around 69,375 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.
Independent shops typically charge around $1,200 for fuel system 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.
Yes — 2 active recall(s) cover fuel system issues on this vehicle. Recall fixes are always free regardless of mileage or warranty status. Use the VIN decoder at the top of the page to check if your specific vehicle is affected.