What is the 2019-2021 Hyundai Nexo Hydrogen Gas Detection Sensors Fail to Detect a Leak in the Delivery System?

The Nexo carries three hydrogen gas detection sensors whose job is to catch a leak in the hydrogen delivery system and trigger shutdown/warning. On 2019-2021 vehicles the sensors can degrade and fail to detect hydrogen, so a real leak can develop with no warning to the driver and… Repairs typically run $0-$0. Severity: high.

What is the 2019-2024 Hyundai Nexo Parking Sensor System Shuts Down Without Warning?

The Nexo's ultrasonic parking sensor system can fail silently, providing no alerts when approaching obstacles in reverse or while parking. The sensors may stop functioning due to software glitches, moisture intrusion, or electrical connector issues, but the system does not always… Repairs typically run $100-$500. Severity: medium.

What is the 2019-2024 Hyundai Nexo Extremely Limited Service Network and Hydrogen Infrastructure?

Hyundai Nexo repair guidance states that some repairs require the vehicle to be defueled, transported to a local hydrogen station, refueled and returned to the shop. The same guidance says hydrogen fueling stations are very limited and may be empty or down for repairs. A separate… Severity: medium.

What is the 2019-2024 Hyundai Nexo Fuel Cell Coolant and Ion (Deionizer) Filter Service Skipped or Grossly Overpriced?

The stack cooling circuit must use deionized coolant: dissolved ions make the coolant electrically conductive and put the high-voltage stack at risk, so the Nexo runs an ion filter (deionizer) that has to be replaced on a schedule along with the fuel cell coolant. Almost no indep… Repairs typically run $250-$1,300. Severity: medium.

What is the 2019-2024 Hyundai Nexo Hydrogen Tank Fails to Fill Beyond 85% Capacity?

Nexo owners consistently report that the hydrogen tanks only fill to approximately 85% of maximum capacity, significantly reducing the advertised 380-mile range. While partially caused by hydrogen station dispenser limitations (pressure drops during busy periods), the vehicle's o… Repairs typically run $0-$0. Severity: low.

What is the 2019-2020 Hyundai Nexo Power Tailgate Stops Working — Spindle Wire Harness Built Without Its Protective Shield?

Some 2019-2020 Nexos left the factory with the power tailgate spindle wire harness missing its protective metallic shield. Unshielded, the wiring is chafed by the spindle motion until the circuit fails and the power tailgate stops operating — usually one side first, then dead. Hy… Repairs typically run $0-$600. Severity: low.

Hyundai · Known Issues

2020 Hyundai Nexo Problems: 11 Known Issues

2020 model year · 215+ owner reports · Updated August 2026

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According to Au7o's analysis of 215+ owner reports, the 2020 Hyundai Nexo has 11 documented known issues, with 6 rated critical. The most serious are Fuel Cell Stack Degradation and Power Loss ($0-$10,000 repair), Remote Smart Parking Assist Keeps Driving After a System Fault — Unintended Vehicle Movement ($0-$0 repair), Thermally Activated Pressure Relief Device (TPRD) Glass Bulb Fractures and Vents Hydrogen — Fire Risk While Parked ($0-$0 repair), Integrated Electronic Brake (IEB) Unit Misreads Sensor Signal and Sharply Reduces Braking Performance ($0-$0 repair), Fuel Cell Stack Coolant Pump Rotor Molding Cracks — DTC P1D3D94, Power Limited and Range Cut to Miles ($1,200-$3,000 repair) and Hydrogen Gas Detection Sensors Fail to Detect a Leak in the Delivery System ($0-$0 repair). The most commonly reported issue is Hydrogen Tank Fails to Fill Beyond 85% Capacity with 120 owner reports. Across all issues with published estimates, repair costs range from $100 to $10,000. DIY maintenance guides at .

Frequently Asked Questions

What are the most common Hyundai Nexo problems?

According to Au7o's analysis of 215+ owner reports, the 2020 Hyundai Nexo has 11 documented issues. The most frequently reported are: Fuel Cell Stack Degradation and Power Loss, Remote Smart Parking Assist Keeps Driving After a System Fault — Unintended Vehicle Movement, Thermally Activated Pressure Relief Device (TPRD) Glass Bulb Fractures and Vents Hydrogen — Fire Risk While Parked. Of these, 6 are rated critical and should be addressed promptly.

Is the Hyundai Nexo reliable?

The 2020 Hyundai Nexo has 11 known issues documented across 215+ owner reports. 6 issues are rated critical: Fuel Cell Stack Degradation and Power Loss and Remote Smart Parking Assist Keeps Driving After a System Fault — Unintended Vehicle Movement and Thermally Activated Pressure Relief Device (TPRD) Glass Bulb Fractures and Vents Hydrogen — Fire Risk While Parked and Integrated Electronic Brake (IEB) Unit Misreads Sensor Signal and Sharply Reduces Braking Performance and Fuel Cell Stack Coolant Pump Rotor Molding Cracks — DTC P1D3D94, Power Limited and Range Cut to Miles and Hydrogen Gas Detection Sensors Fail to Detect a Leak in the Delivery System. 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 Nexo problems?

Repair costs for known Hyundai Nexo issues range from $0 to $10,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Fuel Cell Stack Degradation and Power Loss, typically costs $0-$10,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2019-2024 Hyundai Nexo Fuel Cell Stack Degradation and Power Loss?

The Hyundai Nexo's hydrogen fuel cell stack can experience premature degradation, resulting in reduced power output and range over time. In severe cases, the stack fails entirely, triggering a 'Power Limited due to fuel cell system error' warning and reducing range to as little a… Repairs typically run $0-$10,000. Severity: high.

All 11 Known Issues

Other Hyundai Models

Frequently Asked Questions

What are the most common Hyundai Nexo problems?

Is the Hyundai Nexo reliable?

How much does it cost to fix common Hyundai Nexo problems?

What is the 2019-2024 Hyundai Nexo Fuel Cell Stack Degradation and Power Loss?

2020 Hyundai Nexo: Remote Smart Parking Assist Keeps Driving After a System Fault — Unintended Vehicle Movement#

2019-2021 Hyundai Nexo: Hydrogen Gas Detection Sensors Fail to Detect a Leak in the Delivery System#

2019-2024 Hyundai Nexo: Thermally Activated Pressure Relief Device (TPRD) Glass Bulb Fractures and Vents Hydrogen — Fire Risk While Parked#

2019-2024 Hyundai Nexo: Hydrogen Tank Fails to Fill Beyond 85% Capacity#

2019-2020 Hyundai Nexo: Fuel Cell Stack Coolant Pump Rotor Molding Cracks — DTC P1D3D94, Power Limited and Range Cut to Miles#

2019-2024 Hyundai Nexo: Fuel Cell Coolant and Ion (Deionizer) Filter Service Skipped or Grossly Overpriced#

2019-2024 Hyundai Nexo: Fuel Cell Stack Degradation and Power Loss#

2019-2020 Hyundai Nexo: Integrated Electronic Brake (IEB) Unit Misreads Sensor Signal and Sharply Reduces Braking Performance#

2019-2024 Hyundai Nexo: Parking Sensor System Shuts Down Without Warning#

2019-2024 Hyundai Nexo: Extremely Limited Service Network and Hydrogen Infrastructure#

2019-2020 Hyundai Nexo: Power Tailgate Stops Working — Spindle Wire Harness Built Without Its Protective Shield#

What is the 2020 Hyundai Nexo Remote Smart Parking Assist Keeps Driving After a System Fault — Unintended Vehicle Movement?

What is the 2019-2024 Hyundai Nexo Thermally Activated Pressure Relief Device (TPRD) Glass Bulb Fractures and Vents Hydrogen — Fire Risk While Parked?

What is the 2019-2020 Hyundai Nexo Integrated Electronic Brake (IEB) Unit Misreads Sensor Signal and Sharply Reduces Braking Performance?

What is the 2019-2020 Hyundai Nexo Fuel Cell Stack Coolant Pump Rotor Molding Cracks — DTC P1D3D94, Power Limited and Range Cut to Miles?