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What 6 owners told NHTSA about the 2018 Acura Rlx

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (6)Electrical system (2)Engine (2)Engine & cooling (2)Fuel system (1)

2 of 6 complaints match · Engine · clear filters

Jun 2, 2026Engine

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 determine the cause of the problem. I provided that authorization, and by May 22 the engine had been torn down to the point where the failure could be identified. On May 22, I spoke with my service advisor, Ken, who informed me that the connecting rod bearings were worn and that the engine would need to be replaced. I was sent photographs, a video, and an estimate for the repair totaling $12,943.83. While I was shocked by the cost, Ken advised me that the dealership would be contacting Acura to request goodwill assistance on my behalf. Because this occurred immediately before the Memorial Day weekend, several days passed before I received an update. On May 30, a different service advisor informed me that Acura had approved $8,000 in goodwill assistance. During that conversation, he asked me, “The original estimate was around $16,000, right?” I knew that was incorrect, as the estimate I had received was $12,943.83. Concerned by the discrepancy, I contacted Acura Customer Relations on June 1 and opened a case for review. Later that same day, I spoke with Ken and provided him with the case number. During that conversation, he informed me that the original estimate had been incorrect because certain parts and/or labor had allegedly been omitted. I was then told that the actual repair cost would be approximately $18,000 to $19,000 plus tax. While I can understand minor adjustments to an estimate, a difference of several hundred dollars or even $1,000 might be reasonable. However, an increase of approximately $6,000 from the original estimate is extremely concerning and raises serious questions about the accuracy of the repair assessment and cost estimate. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11741672

Nov 12, 2024Engine

My vehicle has the same 3.5 liter naturally aspirated V6 that comes in the Acrua MDX which is currently on recall for connecting rod bearings on vehicles with 3.5-liter V6 engines can fail, leading to complete engine failure. my car has the excact same engin with the exact same problem. i have the full diagnosis and estimate from Acura ENGINE REPLACEMENT

NHTSA ODI 11624761

Working with the data? Download all 6 complaints as CSV · fetched from NHTSA July 21, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2018 Acura Rlx verdict →