Service Bulletin - The transmission has intermittent harsh or jerky upshifts with steady acceleration.
full bulletin at NHTSA ↗2018 Acura MDX powertrain problems
moderate Owners of the 2018 Acura MDX have filed 22 NHTSA complaints about the powertrain at roughly $2,500 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See powertrain across all vehicles →
Complaints
22
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2014 MDX | 23 |
| 2015 MDX | 10 |
| 2016 MDX | 109 |
| 2017 MDX | 62 |
| 2018 MDX (this page) | 22 |
| 2019 MDX | 29 |
| 2020 MDX | 18 |
| 2022 MDX | 49 |
What stands out
No new NHTSA powertrain complaint has been filed on this vehicle in over 4 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain 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 - The transmission has intermittent harsh or jerky upshifts with steady acceleration.
full bulletin at NHTSA ↗"Service Bulletin - The vehicle may exhibit several of the following symptoms: - Multiple indicators are on. - No communication with the i-HDS. - The option fuse (7.5 A) is blown. - MDX: Fuse E21 - TLX: Fuse B7 - MDX: It is hard to shut off the engine. - TLX: The transmission will not shift from park."
full bulletin at NHTSA ↗Service bulletin - The transmission end cover leaks on vehicles with 9-speed A/T. During assembly, the transmission end cover sealing gasket gets torn.
full bulletin at NHTSA ↗Service bulletin - When adjusting seat height or tilt, the power seat does not move or moves just a small amount and clicks loudly during operation. The vertical transmission assembly (VTA) unit has a stripped internal gear.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of 2018 Acura MDX vehicles consistently describe a 1–2 second hesitation in acceleration, especially from complete stops and after braking. The engine receives input but delivers no power for a second or more, then lurches forward suddenly. This happens every drive for some owners and has caused multiple near-miss collisions during lane changes, merging, and intersection crossings.
Transmission shift quality is also a complaint: hard jerking shifts, particularly in the 25–40 mph range, and refusal to upshift when accelerating onto the freeway. One owner reported transmission replacement on a 2016 MDX (three times) with identical issues, and the problem may recur on 2018 models.
Engine stalling under acceleration—particularly on hills, from stops, and even at highway speeds—adds another layer of concern. Gear shifters occasionally jam in Drive, unable to reach Park or Neutral until the vehicle is restarted. Check engine lights and emission warnings accompany these events in some cases.
Acura dealers consistently claim they cannot reproduce the issues during diagnostics and tell owners the behavior is "normal." TSB 20-015 (TCM software update) has been applied in multiple cases without resolution. One owner reported the issue worsened after an engine recall repair. The safety implications are clear: owners are avoiding highway driving and reporting spouse refusal to drive the vehicle.
Same Acura MDX powertrain reports on nearby years: 2015 · 2016 · 2017 · 2019 · 2020
Failure modes owners describe
Transmission hesitation and delayed acceleration response
Vehicle experiences 1-2 second delay before power delivery after accelerator is pressed, particularly after braking or from a complete stop. Owners report the vehicle 'sits there doing nothing' before suddenly lurching forward with a jerk once power engages.
When: Occurs from complete stops (red lights, stop signs, heavy traffic), after moderate to hard braking, and during low-speed acceleration. Happens every day for some owners; reported from first day of ownership for others. One owner noted it worsened after engine recall repair.
Symptoms owners cite: 1-2 second delay in acceleration response after pressing gas pedal; Vehicle feels unresponsive then suddenly lurches into motion; Jerking sensation during power delivery; Issue present in all drive modes, worse in Sport and Sport+ modes; Occurs consistently in stop-and-go driving patterns; Creates safety hazard during lane changes, merging, and intersection crossing
Repairs/costs cited: Dealers applied TSB 20-015 (TCM update) without resolving the issue in at least one case. One owner reported Acura charged for transmission software update that did not resolve the problem. Dealers frequently state they cannot duplicate the problem.
Recalls/TSBs owners mention: TSB 20-015 TCM update. Multiple owners report dealers cannot reproduce the issue or claim the behavior is 'normal' for 2018 MDX models. One owner reported manufacturer was not made aware of the failure.
Transmission shift quality and hard shifting
Owners report abnormally hard transmission shifts, rough shift engagement, and transmission refusing to upshift when needed. Vehicle may miss-shift or stay locked in one gear during certain driving conditions.
When: Shifts occur abnormally hard; reported especially in the 25-40 mph range and when entering the freeway. Jerking observed during transmission shifts, beginning as early as 6 months after delivery.
Symptoms owners cite: Hard, jerky transmission shifts; Vehicle remains in one gear and will not upshift when needed (e.g., entering freeway); Rough shift engagement; Miss-shifts in 25-40 mph range; Transmission makes noise like trouble shifting smoothly
Repairs/costs cited: One owner mentioned TSB B20-015 and TSB B19-004 exist for 2016-2019 MDX models addressing transmission issues. Dealers unable to replicate during diagnostic attempts.
Recalls/TSBs owners mention: TSB B20-015 and TSB B19-004 referenced by owners. Dealers state they cannot duplicate the shift quality issues during service inspections.
Transmission slip and power loss under load
Vehicle experiences sudden brief loss of engine power or transmission slip under acceleration, particularly at low speeds or on hills. Transmission fails to deliver power for a second or more, leaving vehicle vulnerable in traffic.
When: Occurs during low-speed acceleration, parking lot maneuvers, hill climbing, and highway driving. One owner reported the issue while turning left into oncoming traffic. Another reported stalling while accelerating uphill with children in the vehicle.
Symptoms owners cite: Sudden loss of power during acceleration; Transmission slip sensation; Engine stalls or loses power momentarily while driving; Hiccup-like interruption in power delivery; Sudden deceleration followed by re-acceleration at low speed; Vehicle fails to deliver power when accelerating from a stop
Repairs/costs cited: One owner reported transmission was replaced 3 times on a 2016 MDX with the same issue; unsure if repairs were attempted on 2018. Dealers inform owners 'everything is normal' after transmission checks.
Recalls/TSBs owners mention: Acura reportedly aware of the issue but claims there is no remedy. Manufacturer was not made aware of failure in at least one case. Multiple owners report dealer transmission checks found nothing wrong.
Gear shifter malfunction and inability to change gears
Gear shifter becomes stuck, unable to shift out of Drive or into Park or Neutral. Occurs during or after vehicle stall events. Shifter may respond normally after ignition is cycled.
When: Occurred at approximately 44,000 miles in one documented case. One owner experienced gas pedal becoming unresponsive and vehicle shifting into Neutral while driving at 80 mph on a highway.
Symptoms owners cite: Gear shifter stuck in Drive position; Unable to shift into Park or Neutral; Shifter responds after vehicle is turned off and restarted; Vehicle shifts into Neutral unexpectedly while driving; Multiple warning lights illuminate when failure occurs
Repairs/costs cited: One vehicle with this issue was not repaired; dealer could not duplicate the failure. Owner reported the problem to dealer who informed contact that failure could not be duplicated.
Recalls/TSBs owners mention: Associated with NHTSA Campaign 19V298000 (Engine and Engine Cooling). Manufacturer was contacted but provided no assistance in one case.
Engine stall and power loss while driving
Engine stalls unexpectedly while vehicle is in motion or at stops. One case involved stall at complete stop; another at highway speed. Stalls associated with check engine light, electronic parking brake, and emission warning lights. One owner cited a 'clutch positions controlled error' DTC related to outdated TCM/PCM software.
When: One stall occurred at complete stop with inability to shift gears afterward. Another stall happened on highway at 80 mph during heavy Thanksgiving traffic. Some owners report knocking or ticking from engine before stalls.
Symptoms owners cite: Engine stalls during acceleration or at stops; Loss of all engine power while driving; Check engine light, electronic parking brake light, and emission warning lights illuminate; Ticking or knocking noises from engine before stall; Gas pedal becomes unresponsive during stall event; Brief loss of power reported by owners
Codes mentioned: Clutch positions controlled error (mentioned by Acura technician in one case)
Repairs/costs cited: One Acura technician diagnosed 'clutch positions controlled error' caused by outdated TCM and PCM software. One owner reported Acura attempted to charge for transmission software repair. No successful repairs documented in narratives.
Recalls/TSBs owners mention: One technician indicated the issue is caused by outdated TCM/PCM software, implying software update is intended remedy. Engine recall (NHTSA Campaign 19V298000) may be relevant. One owner reported manufacturer should fix for free; another stated 'manufacturer was not made aware.'
Synthesized from 22 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Car miss shifts especially in the 25 to 40 mph range. Sometimes hesitates when taking off. Also stays in one gear and will not upshift when entering the Freeway. Very dangerous. I found numerous complaints on the web in reference to these problems, but still no recall??? Have told the dealership about these problems with every service, but they said that there is nothing wrong.
While accelerating, the vehicle to decelerated rapidly, the gas pedal became unresponsive when pushed down. Numerous warning lights started Additionally, the vehicle shifted into neutral while the vehicle was being driven and would not shift out even after stopped. I was on a very busy 6 lane highway going 80 mph in thanksgiving traffic, my wife, 1 year old and 3 year old were in the vehicle.…
Had powertrain trouble with your 2018 Acura MDX?
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 2018 Acura MDX?
It's a documented issue but not catastrophic. 22 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Based on the 22 complaints filed, powertrain issues most often appear around 47,928 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/2018/Acura/MDX.
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.