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Chevrolet · Known Issues

Chevrolet Onix Problems & Known Issues

2013-2014, 2017-2024 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 2013-2014, 2017-2024 Chevrolet Onix has 6 documented known issues, with 4 rated critical. The most serious are Underhood Fuse Box Water Ingress — Unintended Starter Activation and Fire Risk Recall (2017-2019) ($0-$0 repair), Engine Fire Risk from ECM Calibration Defect — 1.0 Turbo (Brazil Recall) ($0-$0 repair), Fuel Pump Retaining Nut Leak — Fire Risk Recall (2013-2014) ($0-$0 repair) and Premature Failure of Oil-Bathed Timing Belt (1.0 Turbo CSS Prime) ($300-$2,500 repair). Across all issues with published estimates, repair costs range from $60 to $2,500. DIY maintenance guides at au7o.io.

In This Article

  • Onix Engine2
  • Onix Electrical2
  • Onix Fuel System1
  • Onix HVAC1
  • FAQ
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In This Article

  • Engine2
  • Electrical2
  • Fuel System1
  • HVAC1
  • FAQ

All 6 Known Issues

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Shortly after the second-generation Onix launched in Brazil, GM recalled 19,055 Onix Plus model-year 2020 sedans (produced April 29 to November 6, 2019, chassis LG100091-LG139164) because a faulty engine control module calibration on the new 1.0 turbo three-cylinder could cause abnormal pressure and temperature in the combustion chamber under certain conditions of atmospheric pressure, humidity and fuel composition. The resulting pre-ignition could break pistons, connecting rods or even the engine block, letting hot oil spray onto exhaust components and ignite. At least one vehicle fire was reported in Brazil's Northeast and another occurred at the Gravataí factory, and videos of burning units pressured Procon-SP to notify GM before the recall was formalized in November 2019. Some owners subsequently reported reduced power after the recalibration.

Common Symptoms

  • Sudden loss of power while driving
  • Loud knocking or metallic banging from the engine
  • Oil leaking under the engine bay
  • Smoke or flames from the engine compartment
  • Check engine light after hard acceleration

How to Fix

Free ECM software recalibration at any Chevrolet Brazil dealership (recall service started November 18, 2019; GM offered loaner cars during repairs). Check recall completion on any used MY2020 Onix Plus/Onix 1.0 turbo via the Chevrolet Brasil recall portal using the chassis number. If the engine already suffered piston or block damage, GM replaced engine components under the campaign/warranty.

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Typical repair cost:$0 - $0

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The second-generation Onix and Onix Plus 1.0 turbo (CSS Prime three-cylinder, introduced 2019 for MY2020) use a timing belt that runs immersed in engine oil. GM rates the belt for 240,000 km or 15 years, but Brazilian owners, mechanics and the automotive press have documented widespread premature degradation and outright belt failures between roughly 50,000 and 100,000 km — sometimes under 50,000 km. Oil that does not meet the required Dexos specification (0W-20 for naturally aspirated, 5W-30 for turbo), extended oil-change intervals, sludge or contaminated fuel attacks the belt rubber, which dries, sheds teeth and disintegrates; debris can also clog the oil pickup. When the belt snaps on this interference engine, pistons strike valves and the repair can involve a full cylinder head rebuild or engine replacement, easily exceeding R$10,000. The problem became serious enough that GM South America announced a service action to inspect and replace belts on affected Onix, Onix Plus, Tracker and Montana units, while many warranty claims were initially denied over oil-spec documentation.

Common Symptoms

  • Ticking or rattling noise from the timing cover area
  • Rubber debris or dark sludge found in the engine oil
  • Check engine light with cam/crank correlation faults
  • Engine cranks but will not start after belt failure
  • Sudden engine stop with loss of power steering assist

How to Fix

Use only Dexos-certified oil of the exact specification (5W-30 Dexos 1 for the turbo) and change it strictly on schedule at shorter real-world intervals. Independent Brazilian mechanics recommend preventive belt replacement around 60,000-70,000 km instead of the 240,000 km book interval. Have the belt inspected for swelling, cracking or tooth loss at every oil change; if debris is found in the oil, replace the belt and clean the oil pickup. Vehicles with documented dealer maintenance can claim the GM verification/replacement campaign or warranty coverage.

Typical repair cost:$300 - $2,500

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GM do Brasil recalled Onix and Prisma (along with Cobalt and Spin) vehicles produced between 2016 and 2018 — model years 2017 to 2019 — plus vehicles that received genuine GM replacement fuse boxes in 2018, because the underhood fuse box relay terminals could be installed without adequate insulating protection. Water entering and accumulating at the relay terminals in the engine compartment can cause a short circuit that triggers involuntary, continuous activation of the starter motor. The constantly-engaged starter can overheat to the point of fire, and on a manual-transmission car left parked in gear the cranking starter can move the vehicle on its own. The fix is a 20-minute free service in which the dealer applies insulating sealant to the fuse box relay terminals.

Common Symptoms

  • Starter motor cranks by itself with the key out
  • Clicking sounds from the underhood fuse box after rain or washing
  • Burning smell from the engine bay
  • Car lurches or creeps while parked in gear
  • Intermittent no-start or electrical faults in wet weather

How to Fix

Check recall completion by chassis number on the Chevrolet Brasil recall portal or by phone (0800 702 4200); the insulation service is free and takes about 20 minutes. Warning signs — the starter cranking by itself, clicking from the underhood fuse box after rain or engine washing, or a burning smell — mean the car should be parked away from structures, the battery disconnected, and the dealer service performed immediately. Never leave an unrepaired manual-transmission car parked in gear.

Typical repair cost:$0 - $0

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Owners of 2020-2023 Onix and Onix Plus report recurring failures of the MyLink infotainment system: the screen freezes on the boot logo or with a frozen image, flickers or goes black, the touchscreen and hard buttons stop responding, and the unit reboots randomly. A separate but related software defect causes wireless Android Auto to disconnect intermittently with a 'Wi-Fi interference' message. Because the reversing camera displays through the head unit, a frozen or black screen also takes out the camera image. Complaints are concentrated on Reclame Aqui and the Clube do Onix owner forum across MY2020-2023 vehicles, and GM's fix is a software update applied via official USB pendrive at dealerships — some out-of-warranty owners report being charged for the update, which itself generated complaints.

Common Symptoms

  • Screen frozen on the MyLink boot logo
  • Touchscreen and buttons stop responding
  • Screen flickers, blinks or goes black while driving
  • Wireless Android Auto disconnects with Wi-Fi interference message
  • Reverse camera image unavailable when screen freezes
  • System reboots by itself

How to Fix

Have the dealer apply the latest MyLink firmware update (official GM pendrive procedure) — free under warranty. A temporary workaround for a frozen screen is a system reboot (hold the power button, or lock/unlock the car and let it sleep). For wireless Android Auto dropouts, updating both the head unit firmware and using a quality USB cable connection avoids the Wi-Fi interference bug. Persistent hardware-level failures require head unit replacement under warranty.

Typical repair cost:$0 - $150

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In December 2014, GM do Brasil recalled 400,940 vehicles — Chevrolet Onix and Prisma model years 2013-2014, plus Cobalt 2012-2014 and Spin 2013-2014 — because the plastic retaining nut that secures the fuel pump module to the top of the fuel tank could fail to seal properly. In atypical situations such as a rollover, the defect could allow continuous fuel leakage which, in contact with an external ignition source, could start a fire with risk of injury to occupants and third parties. The recall was publicized by Brazil's Ministry of Justice consumer-protection recall alert system. GM stated it had no confirmed fires linked to the defect at the time of the campaign. The free repair (replacement of the retaining nut or, where necessary, the entire fuel tank) takes about one hour.

Common Symptoms

  • Gasoline or ethanol smell near the rear of the car
  • Fuel odor stronger after filling the tank completely
  • Damp spots or fuel stains on top of the tank area
  • Fuel leak visible under the rear of the vehicle

How to Fix

Verify recall completion on any 2013-2014 Onix/Prisma using the chassis number via the Chevrolet Brasil recall portal or a dealer — Brazilian recalls have no expiration date and the fix is free. The service replaces the fuel pump retaining nut (or the fuel tank if sealing surfaces are damaged). Any persistent fuel smell, especially after filling the tank, should be inspected immediately.

Typical repair cost:$0 - $0

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A chronic and widely reported air-conditioning fault affects second-generation Onix and Onix Plus models (2020+), with similar AC complaints also common on the first generation. The system cools normally for the first few minutes after start-up, then begins blowing warm air even though the compressor stays engaged and refrigerant pressure reads normal; cooling temporarily returns after the car is shut off and restarted. Brazilian AC specialists traced the recurring fault to the expansion valve jamming, which drastically reduces suction in the circuit. Because gauge pressures look normal, shops frequently misdiagnose the problem and replace the compressor (around R$2,000) without fixing anything. The original valve design is considered flawed, so replacement with the same OEM part can fail again; some specialists fit an alternative valve for durability. Complaints about the Onix AC blowing hot air and 'vinegar smell' from the vents are among the most common entries for the model on Reclame Aqui and the Opinautos defect database.

Common Symptoms

  • AC cools at first, then blows warm air after a few minutes
  • Compressor stays engaged but no cold air comes out
  • Cooling returns temporarily after turning the car off and on
  • Sour or vinegar-like smell from the vents
  • Weak airflow from dash vents in hot weather

How to Fix

Replace the AC expansion valve (part approximately R$300) rather than the compressor — confirm the diagnosis by checking evaporator suction behavior, not just static pressures. Replace the cabin filter and sanitize the evaporator if there is a sour smell. Under factory warranty, Chevrolet dealers replace the valve free of charge; out of warranty, some specialists install a more durable alternative valve to prevent recurrence.

Typical repair cost:$60 - $450

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Frequently Asked Questions

What are the most common Chevrolet Onix problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2013-2014, 2017-2024 Chevrolet Onix has 6 documented issues. The most frequently reported are: Underhood Fuse Box Water Ingress — Unintended Starter Activation and Fire Risk Recall (2017-2019), Engine Fire Risk from ECM Calibration Defect — 1.0 Turbo (Brazil Recall), Fuel Pump Retaining Nut Leak — Fire Risk Recall (2013-2014). Of these, 4 are rated critical and should be addressed promptly.

Is the Chevrolet Onix reliable?

The 2013-2014, 2017-2024 Chevrolet Onix has 6 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 4 issues are rated critical: Underhood Fuse Box Water Ingress — Unintended Starter Activation and Fire Risk Recall (2017-2019) and Engine Fire Risk from ECM Calibration Defect — 1.0 Turbo (Brazil Recall) and Fuel Pump Retaining Nut Leak — Fire Risk Recall (2013-2014) and Premature Failure of Oil-Bathed Timing Belt (1.0 Turbo CSS Prime). 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 Chevrolet Onix problems?

Repair costs for known Chevrolet Onix issues range from $0 to $2,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Underhood Fuse Box Water Ingress — Unintended Starter Activation and Fire Risk Recall (2017-2019), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year Chevrolet Onix is the most reliable?

Reliability varies across model years of the Chevrolet Onix. 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 2013-2014, 2017-2024 Chevrolet Onix with 6 documented issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports.

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.

What is the 2017-2019 Chevrolet Onix Underhood Fuse Box Water Ingress — Unintended Starter Activation and Fire Risk Recall (2017-2019)?

GM do Brasil recalled Onix and Prisma (along with Cobalt and Spin) vehicles produced between 2016 and 2018 — model years 2017 to 2019 — plus vehicles that received genuine GM replacement fuse boxes in 2018, because the underhood fuse box relay terminals could be installed without… Repairs typically run $0-$0. Severity: high.

What is the 2020 Chevrolet Onix Engine Fire Risk from ECM Calibration Defect — 1.0 Turbo (Brazil Recall)?

Shortly after the second-generation Onix launched in Brazil, GM recalled 19,055 Onix Plus model-year 2020 sedans (produced April 29 to November 6, 2019, chassis LG100091-LG139164) because a faulty engine control module calibration on the new 1.0 turbo three-cylinder could cause a… Repairs typically run $0-$0. Severity: high.

What is the 2013-2014 Chevrolet Onix Fuel Pump Retaining Nut Leak — Fire Risk Recall (2013-2014)?

In December 2014, GM do Brasil recalled 400,940 vehicles — Chevrolet Onix and Prisma model years 2013-2014, plus Cobalt 2012-2014 and Spin 2013-2014 — because the plastic retaining nut that secures the fuel pump module to the top of the fuel tank could fail to seal properly. In a… Repairs typically run $0-$0. Severity: high.

What is the 2020-2024 Chevrolet Onix Premature Failure of Oil-Bathed Timing Belt (1.0 Turbo CSS Prime)?

The second-generation Onix and Onix Plus 1.0 turbo (CSS Prime three-cylinder, introduced 2019 for MY2020) use a timing belt that runs immersed in engine oil. GM rates the belt for 240,000 km or 15 years, but Brazilian owners, mechanics and the automotive press have documented wid… Repairs typically run $300-$2,500. Severity: high.

What is the 2020-2024 Chevrolet Onix Air Conditioning Stops Cooling — Expansion Valve Jamming?

A chronic and widely reported air-conditioning fault affects second-generation Onix and Onix Plus models (2020+), with similar AC complaints also common on the first generation. The system cools normally for the first few minutes after start-up, then begins blowing warm air even… Repairs typically run $60-$450. Severity: medium.

What is the 2020-2023 Chevrolet Onix MyLink Infotainment Freezing, Black Screen and Wireless Android Auto Dropouts?

Owners of 2020-2023 Onix and Onix Plus report recurring failures of the MyLink infotainment system: the screen freezes on the boot logo or with a frozen image, flickers or goes black, the touchscreen and hard buttons stop responding, and the unit reboots randomly. A separate but… Repairs typically run $0-$150. Severity: medium.