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Hyundai · Known Issues

2017-2023 Hyundai Grandeur Problems: 6 Known Issues

2017-2023 model years · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2017-2023 Hyundai Grandeur has 6 documented known issues, with 3 rated critical. The most serious are Theta II 2.4 GDI connecting-rod bearing wear and engine seizure (Grandeur IG 2.4), 2.5 GDI engine stalls while stopped in Drive — ECU neutral-control software defect (Grandeur GN7) ($0-$100 repair) and Hybrid electronic brake software lets car roll back on hills — official MOLIT recall (Grandeur GN7 HEV) ($0-$100 repair). Across all issues with published estimates, repair costs range from $50 to $1,200. DIY maintenance guides at au7o.io.

In This Article

  • Grandeur Engine3
  • Grandeur Brakes1
  • Grandeur Electrical1
  • Grandeur Steering1
  • FAQ
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In This Article

  • Engine3
  • Brakes1
  • Electrical1
  • Steering1
  • FAQ

All 6 Known Issues

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Hyundai identifies the Grandeur among Korea-market Theta II GDI vehicles receiving expanded Knock Sensor Detection System (KSDS) coverage and a lifetime engine warranty limited to connecting-rod-bearing seizure. Hyundai's official 2019 Grandeur specification identifies its engine as the improved Theta II 2.4 GDi. Hyundai's disclosure also provides compensation terms for eligible customers who experienced engine stoppage or fire because of the covered engine defect.

Common Symptoms

  • Engine stoppage in a covered connecting-rod-bearing-seizure case
  • Engine fire in a covered engine-defect case

How to Fix

Ask a Hyundai service center to check the VIN for applicable KSDS and engine-warranty coverage. KSDS is monitoring software rather than a mechanical repair; any inspection, warranty decision or engine repair depends on the vehicle's eligibility and Hyundai's diagnosis.

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Shortly after the GN7 launched, Hyundai opened a free-repair campaign for 4,818 Grandeur 2.5 GDI cars built November 16, 2022 - January 2, 2023 because the engine could stall while the car sat in Drive with the brake applied. During prolonged stops the transmission's 'neutral control' releases hydraulic pressure to save fuel; the ECU software handled electrical loads in this state poorly, causing unstable idle RPM followed by the engine shutting off. Korean outlets (Motorgraph, M Today/AutoDaily) covered the campaign, which was one of roughly 20 free-repair/recall actions logged against the GN7 in its first year.

Common Symptoms

  • Unstable or fluctuating idle RPM while stopped in Drive with the brake pressed
  • Engine shuts off on its own during a prolonged stop
  • Restart required at traffic lights
  • Possible warning lights after the stall

How to Fix

Apply Hyundai's free ECU software update — delivered over-the-air via Bluelink for connected cars, or in about 20 minutes at a Hyundai direct service center or Blue Hands branch for others. No hardware replacement is required. Any GN7 2.5 GDI from the affected production window that exhibits unstable idle or stalling at a stop should have the campaign status checked at car.go.kr or a dealer.

Typical repair cost:$0 - $100

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High ConfidenceVerifiedReviewed Jun 2026

A chronic problem (고질병) repeatedly cited in Korean owner communities for the Grandeur IG — and its Kia K7 sibling — is engine oil seepage from the front case (timing chain cover), typically appearing after roughly 50,000 km. The sealant between the front case and the block degrades, letting oil weep down the front of the engine; documented cases on the 3.0 V6 describe undercarriage panels soaked in oil, and the issue is also widely reported on 2.4 GDI cars. CV-joint (등속조인트) grease/oil leaks are mentioned alongside it as a related underbody finding during used-car inspections. Left alone, the leak worsens, can foul the drive belt area and triggers low-oil-level conditions.

Common Symptoms

  • Oil seepage or wet residue on the front of the engine block
  • Oil spots under the front of the car
  • Burning oil smell after driving
  • Engine oil level slowly dropping between services
  • Oil-soaked underbody covers found during inspection

How to Fix

Confirm the source with a degrease-and-recheck or UV dye test, since valve cover and CV-joint leaks look similar. The fix is to remove the front timing cover, clean both surfaces, and reseal with fresh liquid gasket — a labor-intensive job (roughly 300,000-700,000 KRW at Korean shops, a few hundred USD). Cars still inside the powertrain warranty have had it resealed free at Hyundai service centers; used-car performance-guarantee insurance has also covered it. Check the oil level regularly until repaired.

Typical repair cost:$250 - $700

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Medium ConfidenceVerifiedReviewed Jun 2026

In April 2023 Korea's Ministry of Land, Infrastructure and Transport announced an official recall of 14,316 Grandeur GN7 hybrids for a configuration error in the electronic (integrated) brake system software. When Smart Cruise Control brought the car to a stop behind another vehicle on an uphill grade, the brake system could release insufficiently and let the car roll backward, creating a collision risk with vehicles behind. This was one of two official GN7 recalls in spring 2023 — alongside roughly 20 free-repair campaigns — that drew heavy Korean press criticism of the model's launch quality.

Common Symptoms

  • Car rolls backward after Smart Cruise Control stops it on an uphill slope
  • Insufficient brake holding force at a standstill on grades
  • Driver must press the brake pedal to prevent rollback

How to Fix

Have the free electronic-brake software update performed; the recall campaign started May 2, 2023 at Hyundai Hi-Tech Centers and Blue Hands branches. MOLIT notes that owners who previously paid to repair this defect can claim reimbursement from Hyundai. Owners can check VIN-specific applicability on the official Korean recall site (car.go.kr).

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Typical repair cost:$0 - $100

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First-year GN7s (production roughly October 2022 - February 2023) accumulated a cluster of documented electrical defects, each with its own Hyundai free-repair or recall campaign: (1) door-handle touch sensors with faulty internal logic that fail to unlock the flush door handles (8,475 cars); (2) LED driver modules (LDM) that intermittently cut headlamp/DRL output in cold weather (1,961 cars); (3) hybrid battery management system software errors causing intermittent 12V battery discharge and no-start mornings (6,006 cars, fixed via OTA); (4) power trunk/tailgate control firmware faults (1,524 cars); and (5) an official March 2023 recall of about 11,200 vehicles for communication failure between the vehicle controller and parking sensors, disabling the rear parking-distance warning and raising back-over collision risk. Korean press tallied about 20 such actions in the model's first year, affecting over 300,000 cumulative repair targets.

Common Symptoms

  • Flush door handles fail to respond to touch and won't unlock the car
  • LED headlights or daytime running lights flicker or go out in cold weather
  • Dead 12V battery / no-start after parking overnight (hybrid)
  • Power trunk or tailgate fails to open or close properly
  • Rear parking-distance warning silent or erratic when reversing

How to Fix

All items are covered by Hyundai free-repair campaigns or the MOLIT recall: software/firmware updates for the door-handle sensors, BMS, power tailgate, and parking-sensor communication (many deliverable over-the-air via Bluelink), and physical replacement of affected LED driver modules. Check the VIN at car.go.kr or a Hyundai service center to confirm which campaigns apply; owners who paid for these repairs can seek reimbursement.

Typical repair cost:$0 - $300

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Community Reported
High ConfidenceVerifiedReviewed Jun 2026

Grandeur IG models (including the 2020+ facelift) with column-mounted electric power steering (C-MDPS) commonly develop a rattling, knocking or 'clunking' noise when the wheel is turned at a stop or at low speed. The noise comes from wear in the steering column's damping components — the flexible coupling and column bearing that prevent metal-to-metal contact. As the parts wear, owners also report increased steering play and a vague or notchy steering feel. The complaint is heavily documented across Korean owner communities (Bobaedream, Clien, AutoView boards) and on Namu Wiki's 6th-generation Grandeur page. Hyundai never declared it an official defect, but Blue Hands service centers perform goodwill free repairs — originally just the coupling/bearing, and more recently full MDPS assembly replacement when needed.

Common Symptoms

  • Rattle or knock from the steering column when turning at a standstill or low speed
  • Clicking/grinding felt through the steering wheel rim
  • Increased free play in the steering wheel
  • Vague or notchy steering feel as wear progresses

How to Fix

Take the car to a Hyundai Blue Hands or direct service center and reproduce the noise; Hyundai has been replacing the worn coupling/bearing — and in persistent cases the entire MDPS assembly — free of charge as a goodwill repair even out of warranty. If paying out of pocket at an independent shop, a coupling replacement is cheap, while a full column/MDPS unit replacement is a four-figure job in USD terms.

Typical repair cost:$50 - $1,200

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Frequently Asked Questions

What are the most common Hyundai Grandeur problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2017-2023 Hyundai Grandeur has 6 documented issues. The most frequently reported are: Theta II 2.4 GDI connecting-rod bearing wear and engine seizure (Grandeur IG 2.4), 2.5 GDI engine stalls while stopped in Drive — ECU neutral-control software defect (Grandeur GN7), Hybrid electronic brake software lets car roll back on hills — official MOLIT recall (Grandeur GN7 HEV). Of these, 3 are rated critical and should be addressed promptly.

Is the Hyundai Grandeur reliable?

The 2017-2023 Hyundai Grandeur has 6 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 3 issues are rated critical: Theta II 2.4 GDI connecting-rod bearing wear and engine seizure (Grandeur IG 2.4) and 2.5 GDI engine stalls while stopped in Drive — ECU neutral-control software defect (Grandeur GN7) and Hybrid electronic brake software lets car roll back on hills — official MOLIT recall (Grandeur GN7 HEV). 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 Hyundai Grandeur problems?

Repair costs for known Hyundai Grandeur issues range from $0 to $1,200, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year Hyundai Grandeur is the most reliable?

Reliability varies across model years of the Hyundai Grandeur. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2017-2023 Hyundai Grandeur with 6 documented issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports.

What is the 2017-2019 Hyundai Grandeur Theta II 2.4 GDI connecting-rod bearing wear and engine seizure (Grandeur IG 2.4)?

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 compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.

Hyundai identifies the Grandeur among Korea-market Theta II GDI vehicles receiving expanded Knock Sensor Detection System (KSDS) coverage and a lifetime engine warranty limited to connecting-rod-bearing seizure. Hyundai's official 2019 Grandeur specification identifies its engine… Severity: high.

What is the 2023 Hyundai Grandeur 2.5 GDI engine stalls while stopped in Drive — ECU neutral-control software defect (Grandeur GN7)?

Shortly after the GN7 launched, Hyundai opened a free-repair campaign for 4,818 Grandeur 2.5 GDI cars built November 16, 2022 - January 2, 2023 because the engine could stall while the car sat in Drive with the brake applied. During prolonged stops the transmission's 'neutral con… Repairs typically run $0-$100. Severity: high.

What is the 2023 Hyundai Grandeur Hybrid electronic brake software lets car roll back on hills — official MOLIT recall (Grandeur GN7 HEV)?

In April 2023 Korea's Ministry of Land, Infrastructure and Transport announced an official recall of 14,316 Grandeur GN7 hybrids for a configuration error in the electronic (integrated) brake system software. When Smart Cruise Control brought the car to a stop behind another vehi… Repairs typically run $0-$100. Severity: high.

What is the 2017-2020 Hyundai Grandeur Engine front case (timing cover) oil leak (Grandeur IG)?

A chronic problem (고질병) repeatedly cited in Korean owner communities for the Grandeur IG — and its Kia K7 sibling — is engine oil seepage from the front case (timing chain cover), typically appearing after roughly 50,000 km. The sealant between the front case and the block degrad… Repairs typically run $250-$700. Severity: medium.

What is the 2023 Hyundai Grandeur Launch-year electrical faults: door-handle touch sensors, LED driver modules, hybrid battery drain, parking-sensor communication (Grandeur GN7)?

First-year GN7s (production roughly October 2022 - February 2023) accumulated a cluster of documented electrical defects, each with its own Hyundai free-repair or recall campaign: (1) door-handle touch sensors with faulty internal logic that fail to unlock the flush door handles… Repairs typically run $0-$300. Severity: medium.

What is the 2017-2022 Hyundai Grandeur C-MDPS steering column clunk and rattle (Grandeur IG)?

Grandeur IG models (including the 2020+ facelift) with column-mounted electric power steering (C-MDPS) commonly develop a rattling, knocking or 'clunking' noise when the wheel is turned at a stop or at low speed. The noise comes from wear in the steering column's damping componen… Repairs typically run $50-$1,200. Severity: medium.