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Acura · Known Issues

2018 Acura MDX Problems: 5 Known Issues

2018 model year · 3,600+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 3,600+ owner reports, the 2018 Acura MDX has 5 documented known issues, with 4 rated critical. The most serious are ZF 9-Speed Automatic Transmission Shudder and Harsh Shifting ($200-$3,200 repair), Auto Idle-Stop Failure to Restart (2016-2020 MDX) ($0-$1,500 repair), Fuel Pump Impeller Deformation Causing Stall (NHTSA Recall 23V-858) ($0-$0 repair) and ZF 9-Speed Transmission Hesitation, Hard Shifts and Stalling (2016-2019 MDX) ($0-$6,500 repair). The most commonly reported issue is ZF 9-Speed Automatic Transmission Shudder and Harsh Shifting with 2,400 owner reports. Across all issues with published estimates, repair costs range from $200 to $6,500. DIY maintenance guides at au7o.io.

In This Article

  • MDX Transmission2
  • MDX Electrical2
  • MDX Fuel System1
  • Recalls14
  • FAQ
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In This Article

  • Transmission2
  • Electrical2
  • Fuel System1
  • Recalls14
  • FAQ

All 5 Known Issues

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ALL YEARS20202019201820172016201520142013201220112010200920082007200620052004200320022001
Community reported
2,400 owners

On the 2016-2020 Acura MDX 3.5L J35Y5 V6, third-generation MDX models with the ZF 9-speed automatic suffer from torque converter shudder during light throttle acceleration between 30-50 mph. The lockup clutch in the torque converter vibrates as it engages, creating a sensation similar to driving over rumble strips that many owners mistake for an engine misfire.

This issue also affects: Acura CL, Acura ILX, Acura TL

Common Symptoms

  • Vibration/shudder at 30-50 mph under light throttle
  • Sensation like driving over rumble strips
  • Shudder disappears under hard acceleration
  • Vibration felt through seat and steering wheel
  • Transmission slipping sensation

How to Fix

Update the TCM software to the latest Acura calibration that modifies torque converter lockup strategy. Perform a complete ATF drain and refill with Honda DW-1. If shudder persists after software update and fluid change, the torque converter assembly must be replaced.

Owner tips & cautions

  • TipGet the TCM update first — it resolves about 70% of cases for free under warranty. If the shudder returns after 10,000 miles, the torque converter needs replacement. Do not let the dealer just change fluid and send you home.
Typical repair cost:$200 - $3,200

Research This Issue

Based on 2,400 owner reports

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Community Reported
High Confidence2,400 owner reportsLast reported by owners Jan 2026Reviewed Mar 2026

On the 2016-2019 Acura MDX, the ZF 9HP 9-speed automatic introduced on the 2016 MDX suffers from documented hesitation, harsh shifts, lurching, and unexpected downshifts/deceleration. Drivers report the vehicle hesitating from a stop, banging into gear, or briefly losing power. Software miscommunication between TCM, ECM and throttle control is the alleged root cause; a class action was filed alleging Honda knew of the defect from 2015.

This issue also affects: Acura CL, Acura TL, Honda Passport

Common Symptoms

  • Hesitation from a stop
  • Hard or banging shifts
  • Unexpected downshift while cruising
  • Brief loss of power
  • Lurching at low speed

How to Fix

Have dealer apply latest TCM/PGM-FI software updates first (covered by powertrain warranty). If symptoms persist, request fluid replacement and dealer escalation; document everything for lemon-law/class-action relief. Avoid jerky throttle inputs while cold.

Typical repair cost:$0 - $6,500

Research This Issue

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Community Reported
High ConfidenceVerifiedReviewed Jun 2026

On the 2016-2020 Acura MDX J35Y5, on 2016-2020 Acura MDX with the 3.5L V6 (J35Y5) and Auto Idle-Stop, the engine may fail to automatically restart from a stop event, leaving the driver stranded in traffic. NHTSA opened an Engineering Analysis (PE22-016 → EA) after 1,300+ complaints across ~2.2M Honda/Acura vehicles, with 4 confirmed accidents. Acura issued Service Bulletin 23-001 in January 2023 with a PGM-FI software update (reduces idle-stop operating range) and extended warranty coverage on starter replacement and valve adjustment to 10 years / unlimited miles. Note: the Sport Hybrid (J30Y1) uses a different motor-based stop/start system and is not in scope of this TSB.

Common Symptoms

  • Engine does not restart after auto-stop event
  • Have to press Start button or shift to Park to restart
  • Warning chime / MIL
  • Battery drain after repeated failures

How to Fix

Have dealer perform the PGM-FI idle-stop software update plus starter / starter relay inspection per Honda's 2023 service campaign (covered 10 years). To avoid recurrence, defeat Idle-Stop with the dash button each drive or install an aftermarket auto-disable module.

Typical repair cost:$0 - $1,500

Research This Issue

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Community Reported
High ConfidenceVerifiedReviewed Jun 2026
Community reported
1,200 owners

On the 2014-2020 Acura MDX 3.5L J35Y5 V6, the AcuraLink infotainment system in third-gen MDX models experiences random reboots during driving, temporarily disabling navigation, audio, and the backup camera. The system takes 30-60 seconds to restart, leaving the driver without audio or navigation guidance mid-route.

This issue also affects: Acura RDX, Acura TLX

Common Symptoms

  • Screen goes black and reboots while driving
  • Audio cuts out for 30-60 seconds
  • Navigation loses route mid-trip
  • Backup camera unavailable after reboot
  • Bluetooth disconnects and fails to reconnect

How to Fix

Update to the latest infotainment firmware from an Acura dealer. Reset the system to factory defaults and clear cached data. If reboots continue, the infotainment control module may need hardware replacement under an extended warranty program.

Owner tips & cautions

  • TipAsk the dealer specifically for the latest firmware version — many dealers install outdated updates. The 2019 firmware revision dramatically reduced reboot frequency for most owners.

Research This Issue

Based on 1,200 owner reports

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Community Reported
High Confidence1,200 owner reportsLast reported by owners Oct 2025Reviewed Mar 2026

On the 2018-2020 Acura MDX, certain 2018-2020 MDX (J35Y5 3.5L V6) and MDX Sport Hybrid (3.0L V6 hybrid) units were built with low-density, improperly molded in-tank fuel pump impellers. Surface cracking from production solvent absorption causes the impeller to swell and seize against the pump body, leading to no-start or stall while driving. Honda issued NHTSA recall 23V-858 covering ~2.5 million Honda/Acura vehicles.

This issue also affects: Acura ILX, Acura TLX, Honda Accord

Common Symptoms

  • Engine stall while driving
  • Long cranking / no-start
  • Intermittent loss of power
  • Check Engine Light
  • Fuel pump warning

How to Fix

Free recall remedy under NHTSA 23V-858 - dealer replaces the fuel pump module with a redesigned part. Check VIN at nhtsa.gov/recalls or owners.acura.com and schedule replacement immediately if not yet completed.

Typical repair cost:$0 - $0

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Jun 2026
NHTSA Recalls14 recalls

FUEL SYSTEM, OTHER:DELIVERY:FUEL PUMP

Honda (American Honda Motor Co.) is recalling certain 2016-2018 Acura MDX, 2015-2019 Acura TLX and 2015-2017 Honda Accord vehicles, equipped with a 3.5L V6 engine. Particulates in fuel may adhere to the internal components of the fuel pump, reducing its performance.

Campaign #19V06000029/01/2019

EXTERIOR LIGHTING:TAIL LIGHTS

Honda (American Honda Motor Co.) is recalling certain 2014-2019 Acura MDX and 2017-2019 Acura MDX Sport Hybrid vehicles. Moisture may enter the tailgate lid lights, possibly causing a loss of the tailgate lid lights and the taillights.

Campaign #19V25600028/03/2019

FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY

Honda (American Honda Motor Co.) is recalling certain model year 2015 Acura MDX 2WD and MDX 4WD vehicles, 2016 Acura MDX 4WD vehicles, 2015-2016 Honda Odyssey vehicles, and 2016 Honda Pilot 2WD and 4WD vehicles. The affected vehicles have fuel tanks that were manufactured with insufficient welds which may separate and allow fuel to leak out.

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Other Acura Models

Acura Integra19Acura RDX17Acura TLX15Acura TL14Acura RSX14Acura ILX12

Frequently Asked Questions

What are the most common Acura MDX problems?

According to Au7o's analysis of 3,600+ owner reports, the 2018 Acura MDX has 5 documented issues. The most frequently reported are: ZF 9-Speed Automatic Transmission Shudder and Harsh Shifting, Auto Idle-Stop Failure to Restart (2016-2020 MDX), Fuel Pump Impeller Deformation Causing Stall (NHTSA Recall 23V-858). Of these, 4 are rated critical and should be addressed promptly.

Is the Acura MDX reliable?

The 2018 Acura MDX has 5 known issues documented across 3,600+ owner reports. 4 issues are rated critical: ZF 9-Speed Automatic Transmission Shudder and Harsh Shifting and Auto Idle-Stop Failure to Restart (2016-2020 MDX) and Fuel Pump Impeller Deformation Causing Stall (NHTSA Recall 23V-858) and ZF 9-Speed Transmission Hesitation, Hard Shifts and Stalling (2016-2019 MDX). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Acura MDX problems?

Repair costs for known Acura MDX issues range from $0 to $6,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, ZF 9-Speed Automatic Transmission Shudder and Harsh Shifting, typically costs $200-$3,200 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2016-2020 Acura MDX ZF 9-Speed Automatic Transmission Shudder and Harsh Shifting?

Third-generation MDX models with the ZF 9-speed automatic suffer from torque converter shudder during light throttle acceleration between 30-50 mph. The lockup clutch in the torque converter vibrates as it engages, creating a sensation similar to driving over rumble strips that m… Repairs typically run $200-$3,200. Severity: high.

What is the 2016-2020 Acura MDX Auto Idle-Stop Failure to Restart (2016-2020 MDX)?

On 2016-2020 Acura MDX with the 3.5L V6 (J35Y5) and Auto Idle-Stop, the engine may fail to automatically restart from a stop event, leaving the driver stranded in traffic. NHTSA opened an Engineering Analysis (PE22-016 → EA) after 1,300+ complaints across ~2.2M Honda/Acura vehicl… Repairs typically run $0-$1,500. Severity: high.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 3,600+ owner reports, NHTSA recalls, TSBs, and automotive forums.

Campaign #16V417000
09/06/2016

ENGINE AND ENGINE COOLING:ENGINE:HARD PARTS INTERNAL/MECHANICAL

Honda (American Honda Motor Co.) is recalling certain 2015-2020 Acura TLX, 2016-2020 Acura MDX, 2016 and 2018-2019 Pilot, 2017 and 2019 Ridgeline, and 2018-2019 Odyssey vehicles. Due to a manufacturing error, the connecting rod bearing in the engine may wear and seize, damaging the engine.

Campaign #23V75100013/11/2023

FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP

Honda (American Honda Motor Co.) is recalling certain 2013-2023 Honda Accord, Civic Coupe, Civic Sedan, Civic Hatchback, Civic Type R, CR-V, HR-V, Ridgeline, Odyssey, Acura ILX, MDX, MDX Hybrid, RDX, RLX, TLX, 2019-2022 Honda Insight, Passport, 2020 Honda CR-V Hybrid, 2018-2019 Honda Clarity PHEV, Fit, and 2015-2020 Honda Accord Hybrid, Pilot, Acura NSX vehicles. The fuel pump inside the fuel tank may fail.

Campaign #23V85800018/12/2023

+ 9 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

What is the 2018-2020 Acura MDX Fuel Pump Impeller Deformation Causing Stall (NHTSA Recall 23V-858)?

Certain 2018-2020 MDX (J35Y5 3.5L V6) and MDX Sport Hybrid (3.0L V6 hybrid) units were built with low-density, improperly molded in-tank fuel pump impellers. Surface cracking from production solvent absorption causes the impeller to swell and seize against the pump body, leading… Repairs typically run $0-$0. Severity: high.

What is the 2016-2019 Acura MDX ZF 9-Speed Transmission Hesitation, Hard Shifts and Stalling (2016-2019 MDX)?

The ZF 9HP 9-speed automatic introduced on the 2016 MDX suffers from documented hesitation, harsh shifts, lurching, and unexpected downshifts/deceleration. Drivers report the vehicle hesitating from a stop, banging into gear, or briefly losing power. Software miscommunication bet… Repairs typically run $0-$6,500. Severity: high.

What is the 2014-2020 Acura MDX Infotainment System Random Reboots?

The AcuraLink infotainment system in third-gen MDX models experiences random reboots during driving, temporarily disabling navigation, audio, and the backup camera. The system takes 30-60 seconds to restart, leaving the driver without audio or navigation guidance mid-route. Severity: medium.