AutoUtility currently tracks 6 official NHTSA owner defect complaints for the 2018 Acura RLX. Engine & Cooling issues are the most frequently reported category, appearing in 4 complaints (66.7% of submitted records). Zero crashes, fires, injury reports, or fatality reports are cited across these complaint records.

Key Problem Findings
  • Total NHTSA Complaints: 6 reports
  • #1 Reported Problem Area: Engine & Cooling (4 reports • 66.7% of submitted complaints)
  • Secondary Problem Areas: Electrical System (2), Fuel & Propulsion System (1)
  • Crash-Citing Complaints: 0 filings
  • Fire-Citing Complaints: 0 filings
  • Complaints Reporting Injuries / Fatalities: 0 injury filings • 0 fatality filings
Reporting Methodology: Statistics describe unverified consumer submissions voluntarily filed with NHTSA. Complaint volume is not normalized for vehicle sales volume or miles driven. Multiple components can be cited within a single owner complaint submission.
Total Complaints
6
Submitted to NHTSA ODI
Crash-Citing Complaints
0
Filings citing a collision
Fire-Citing Complaints
0
Filings citing smoke or fire
Complaints Reporting Injuries
0
Filings citing one or more injuries
Complaints Reporting Fatalities
0
Consumer filings citing fatalities

Most Reported Problems for 2018 Acura RLX

Top automotive subsystem defect categories ranked by unique owner complaint volume in federal records

#1 Problem Area 66.7% of complaints

Engine & Cooling

4 owner complaints submitted to NHTSA ODI
✓ 0 crashes or fires cited
#2 Problem Area 33.3% of complaints

Electrical System

2 owner complaints submitted to NHTSA ODI
✓ 0 crashes or fires cited
#3 Problem Area 16.7% of complaints

Fuel & Propulsion System

1 owner complaint submitted to NHTSA ODI
⚠️ NHTSA Recall Context

NHTSA records list 1 official safety recall campaign for this model year involving the same broad component area:

*Component overlap means an official recall exists for the same broad vehicle system. It does not establish that an individual owner complaint was caused by, covered by, or resolved through that recall.
✓ 0 crashes or fires cited
Domain Share Note: Share percentage represents the proportion of unique complaint filings referencing each vehicle system. Because single complaints may cite multiple systems (such as engine and electrical simultaneously), domain percentages represent individual category incidence and may sum to over 100%.

Recent NHTSA Owner Reports for 2018 Acura RLX

Representative defect filings submitted by owners to the NHTSA Office of Defects Investigation

Engine & Cooling NHTSA ODI ID: #11741672
Filed: 06/02/2026

"The first time I heard the engine noise was on [XXX]. I brought the vehicle to the Schaumburg Muller Acura dealership and dropped it off on May 20. On May 21, the dealership performed an initial inspection and informed me that they needed authorization to further disassemble the engine in order to..."

Incident Date: 05/20/2026 • Raw NHTSA Component: ENGINE
Engine & Cooling NHTSA ODI ID: #11738529
Filed: 05/18/2026

"The contact owns a 2018 Acura RLX. The contact stated while driving her vehicle at an undisclosed speed, stated that the vehicle would not start up, and noticed every single waring light illuminated up on her dash. The vehicle was taken to a dealer twice, first time it was diagnosed to have a crank..."

Incident Date: 12/01/2025 • Raw NHTSA Component: ELECTRICAL SYSTEM,ENGINE AND ENGINE COOLING
Electrical System NHTSA ODI ID: #11722582
Filed: 03/06/2026

"The contact owns a 2018 Acura RLX. The contact stated that while attempting to start the vehicle, the headlight failure message was displayed. A dealer was contacted. The vehicle was taken to the dealer, where it was diagnosed that the A/C compressor needed to be replaced. The vehicle was not..."

Incident Date: 03/15/2023 • Raw NHTSA Component: ELECTRICAL SYSTEM
Engine & Cooling NHTSA ODI ID: #11642306
Filed: 02/12/2025

"The contact owns a 2018 Acura RLX. The contact stated while driving 30 MPH, the oil change and tire rotation messages were displayed. The contact stated that a dealer was contacted. The contact stated that an oil change and tire rotation were performed, and the contact was informed that the engine..."

Incident Date: 02/08/2025 • Raw NHTSA Component: ENGINE AND ENGINE COOLING
Fuel & Propulsion System NHTSA ODI ID: #11628568
Filed: 12/03/2024

"The contact owns a 2018 Acura RLX. The contact received notification of NHTSA Campaign Number: 23V858000 (Fuel System, Gasoline); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The..."

Incident Date: 12/03/2024 • Raw NHTSA Component: FUEL SYSTEM, GASOLINE
Consumer Narrative Notice: Excerpts are sanitized text descriptions submitted by vehicle owners to the federal ODI database. They reflect the reporting consumer's observations at the time of filing and have not been independently confirmed by vehicle manufacturers or government investigators.

Complaint History for Acura RLX

Reported defect complaint volume across sibling model years (2015–2020)

Model Year NHTSA Complaints Crash Reports Safety Recalls Detailed Report
2015 Acura RLX 11 0 3 View 2015 Problems →
2016 Acura RLX 5 1 0 View 2016 Problems →
2017 Acura RLX 3 0 0 View 2017 Problems →
2018 Acura RLX Current Page 6 0 1 Current
2019 Acura RLX 0 0 3 View 2019 Problems →
2020 Acura RLX 2 0 1 View 2020 Problems →
Comparative Disclaimer: Complaint totals are unadjusted historical counts and are not normalized for vehicles sold, active fleet size, or total road mileage. Newer model years naturally have had less calendar exposure time to accumulate owner filings.

Detailed NHTSA Component Breakdown for 2018 Acura RLX

Complete distribution of consumer defect reports across all 5 granular NHTSA system and subsystem classifications

Vehicle Component / System Total Complaints Crash Reports Fire Reports Reported Injury Entries Reported Fatality Entries
Engine NHTSA category: ENGINE 2 0 0 0 0
Electrical System NHTSA category: ELECTRICAL SYSTEM 1 0 0 0 0
ELECTRICAL SYSTEM,ENGINE AND ENGINE COOLING 1 0 0 0 0
Engine & Cooling NHTSA category: ENGINE AND ENGINE COOLING 1 0 0 0 0
Fuel System NHTSA category: FUEL SYSTEM, GASOLINE 1 0 0 0 0
Data Attribution & Reporting Methodology: Complaints are unverified voluntary submissions to the NHTSA Office of Defects Investigation (ODI). Because multiple vehicle components can be cited within a single owner complaint submission, component-level rollups may sum to more than the unique complaint count (6). Injury and fatality entries in the detailed table reflect raw values entered by reporting consumers across individual submissions; they are not deduplicated casualty statistics and may include duplicate or unverified entries. Complaint volume is not normalized for sales volume or vehicle mileage and does not represent an audited component failure rate.

Official NHTSA Defect Investigations (2)

2 CLOSED

Formal safety defect inquiries and engineering analyses opened by the NHTSA Office of Defects Investigation (ODI)

Official Federal Inquiries: NHTSA opens a defect investigation when safety screening or consumer defect trends indicate a potential unreasonable safety risk. An open investigation is a formal inquiry and does not by itself confirm a defect or result in a mandatory recall.
CLOSED Defect Petition (DP) ODI Action #DP22005
Opened: 2023-01-27 • Closed: 2023-08-07

Pedestrian alert sounds

Affected Component: ELECTRICAL SYSTEM:PROPULSION SYSTEM

NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles. The standard applies to hybrid and electric vehicles that have a gross vehicle weight ra...

✓ Resulted in Safety Recall Campaign: 22V063000 Official NHTSA File →
CLOSED Engineering Analysis (EA) ODI Action #EA19001
Opened: 2019-04-19 • Closed: 2024-09-19

Electrical overstress

Affected Component: AIR BAGS: AIR BAG/RESTRAINT CONTROL MODULE

The Office of Defects Investigation (ODI) opened this investigation to determine if the failure of airbags to deploy during severe crashes, in certain vehicles, was the result of a safety related defect.  During the investigation a complex failure was studied that can result in non-deployment of subject vehicle air bags and other restraint system devices in severe crash events. The subject vehicles may be equipped with an airbag control unit (AC...

✓ Resulted in Safety Recall Campaign: 20V024 Official NHTSA File →
Official US Government Data Provenance

The complaint records on this page are retrieved directly from the NHTSA Office of Defects Investigation (ODI) public database.

Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.