Hyundai Tucson TL-FL(TL) — Problems & Common Faults
Weaknesses, engine ratings and buying advice
The Hyundai Tucson TL-FL (2018–2020) is the facelift of the third-generation Tucson — and for diesel buyers it's the stronger choice over the base TL (2015–2017) for one clear reason: the new D4FE Smartstream diesel replaced the outgoing 1.7 CRDi, bringing quieter running, better torque, and improved efficiency. The facelift also brought revised damper tuning and updated safety systems. One major caveat remains: the dual-clutch gearbox.
The new engine: The D4FE (1.6L CRDi Smartstream, 115–136 hp) is quieter, more efficient, and produces more torque than the unit it replaced — 280–320 Nm depending on output level, real-world consumption 38–43 mpg. Known Smartstream diesel weak points: DPF clogging for predominantly urban drivers from 30,000 km (replacement $3,000–5,000), EGR valve fouling, and the AdBlue SCR system needs regular top-up (every 15,000–20,000 km). Short city trips are a cost trap with the D4FE — long-distance users routinely reach 250,000 km without major intervention.
Gearbox decision: The 7-speed DCT is the TL-FL's biggest liability — low-speed judder, gear-change hesitation between 25–40 mph, clutch pack wear from 40,000–60,000 km. Repair costs up to $7,700. Hyundai acknowledged the problem and issued software updates — these help, but do not fix the mechanical root cause. The 6-speed manual is the only recommended transmission.
Recall: ABS module fire risk (78,542 vehicles, 2017–2020). Verify completion by VIN before any purchase.
Test-drive checklist: D4FE: have the DPF regeneration history read from the ECU at a specialist. DCT: creeping in a car park or on a slope for judder and overheating warnings. Manual: all gears clean and dry. Infotainment for spontaneous reboots. ABS recall status by VIN.
2026 market: D4FE manual in good condition: $11,000–16,500. DCT models cheaper — risk priced in at $8,500–13,000. AWD variants in demand, $1,500–2,000 premium.
Insider pick: D4FE 1.6 CRDi 136 hp 6-speed manual, MY 2019–2020, under 100,000 km, demonstrable long-distance use, ABS recall completed — the best diesel Tucson yet, with the gearbox that actually works.
136 PS
Tucson · Diesel
Comfy SUV, family-first
DecentGenerations
Engine Overview
The Hyundai Tucson TL-FL is available with 7 engine variants — from 116 to 185 hp.
Updated 1.6L CRDi from the Smartstream diesel family — successor to the D4FB with improved emissions treatment. EGR valve fouling is the most common issue. DPF regeneration fails regularly on short-trip driving. VTG turbocharger occasionally sticks. High-pressure fuel issues on some examples. A decent diesel that needs regular long-distance driving to keep DPF and EGR clean.
- !! EGR valve contamination from 110,000 km
The EGR system on the 1.6 CRDi D4FE is prone to soot deposits in urban use. Cleaning the EGR valve and intake manifold is recommended to prevent swirl flap breakage.
Symptoms: Power loss, rough running, check engine light, EGR fault codes (P0400–P0409). - !! DPF regeneration fails on short trips from 80,000 km
The diesel particulate filter of the Smartstream D4FE does not fully regenerate in predominantly short-trip use. The engine enters limp mode; complete DPF cleaning or replacement becomes necessary.
Symptoms: Limited engine output (limp mode, max. 3,000 rpm), check engine light, DPF warning indicator, unpleasant smell after failed regeneration. - !! VTG turbocharger actuator seized from 100,000 km
The variable turbine geometry (VTG) of the Smartstream turbocharger tends to stick with carbon build-up. Vehicle enters limp mode; sometimes only cleaning is needed, sometimes the turbo must be replaced.
Symptoms: Sudden power loss, limp mode, irregular turbo response depending on driving situation.
+ 4 more engine weaknesses + vehicle weaknesses
Updated 1.6L CRDi from the Smartstream diesel family — successor to the D4FB with improved emissions treatment. EGR valve fouling is the most common issue. DPF regeneration fails regularly on short-trip driving. VTG turbocharger occasionally sticks. High-pressure fuel issues on some examples. A decent diesel that needs regular long-distance driving to keep DPF and EGR clean.
- !! EGR valve contamination from 110,000 km
The EGR system on the 1.6 CRDi D4FE is prone to soot deposits in urban use. Cleaning the EGR valve and intake manifold is recommended to prevent swirl flap breakage.
Symptoms: Power loss, rough running, check engine light, EGR fault codes (P0400–P0409). - !! DPF regeneration fails on short trips from 80,000 km
The diesel particulate filter of the Smartstream D4FE does not fully regenerate in predominantly short-trip use. The engine enters limp mode; complete DPF cleaning or replacement becomes necessary.
Symptoms: Limited engine output (limp mode, max. 3,000 rpm), check engine light, DPF warning indicator, unpleasant smell after failed regeneration. - !! VTG turbocharger actuator seized from 100,000 km
The variable turbine geometry (VTG) of the Smartstream turbocharger tends to stick with carbon build-up. Vehicle enters limp mode; sometimes only cleaning is needed, sometimes the turbo must be replaced.
Symptoms: Sudden power loss, limp mode, irregular turbo response depending on driving situation.
+ 4 more engine weaknesses + vehicle weaknesses
Mid-range diesel — 2.0L CRDi with 100–136 kW for the SUV models. EGR valve fouls regularly. DPF clogs on short trips. Fuel-oil dilution (diesel in oil) is a serious concern — frequent oil changes and long-distance driving are mandatory. VGT actuator seizes occasionally. Timing chain rattles with neglected oil changes.
- !! Fuel in engine oil (diesel dilution) from 80,000 km
During DPF regeneration, diesel can enter the engine oil via post-injection. Above 2% dilution, bearing damage threatens. Leaking injector copper washers amplify the problem.
Symptoms: Rising oil level without topping up, fuel smell on dipstick, sooty or thin engine oil at change. - !! EGR valve fouling from 95,000 km
D4HA 2.0 CRDi shows typical diesel EGR valve problems in short-trip use. Regularly check the intake manifold with swirl flaps for broken fragments.
Symptoms: Engine power loss, rough idle, EGR fault codes, engine limp mode. - !! DPF clogging from 120,000 km
The D4HA DPF clogs on frequent short-trip use. Active regeneration requires motorway runs. Filter replacement is costly.
Symptoms: DPF warning light, engine limp mode, power loss, increased fuel consumption.
+ 4 more engine weaknesses + vehicle weaknesses
Mid-range diesel — 2.0L CRDi with 100–136 kW for the SUV models. EGR valve fouls regularly. DPF clogs on short trips. Fuel-oil dilution (diesel in oil) is a serious concern — frequent oil changes and long-distance driving are mandatory. VGT actuator seizes occasionally. Timing chain rattles with neglected oil changes.
- !! Fuel in engine oil (diesel dilution) from 80,000 km
During DPF regeneration, diesel can enter the engine oil via post-injection. Above 2% dilution, bearing damage threatens. Leaking injector copper washers amplify the problem.
Symptoms: Rising oil level without topping up, fuel smell on dipstick, sooty or thin engine oil at change. - !! EGR valve fouling from 95,000 km
D4HA 2.0 CRDi shows typical diesel EGR valve problems in short-trip use. Regularly check the intake manifold with swirl flaps for broken fragments.
Symptoms: Engine power loss, rough idle, EGR fault codes, engine limp mode. - !! DPF clogging from 120,000 km
The D4HA DPF clogs on frequent short-trip use. Active regeneration requires motorway runs. Filter replacement is costly.
Symptoms: DPF warning light, engine limp mode, power loss, increased fuel consumption.
+ 4 more engine weaknesses + vehicle weaknesses
Naturally aspirated direct-injection from the Gamma family — 1.6L with 97–99 kW. Intake valve carbon buildup from GDI is the dominant theme — valves soot up without port washing. High-pressure fuel pump can fail at high mileage. Valve stem seals wear faster under GDI operation. Thermostat fails early. Timing chain stretches. An engine that deserves regular walnut-blasting valve cleaning.
- !! High-pressure fuel pump failure from 110,000 km
The GDi high-pressure fuel pump can fail. Using low-quality fuel or extended oil change intervals significantly increases the risk.
Symptoms: Extended cranking time, stumbling at low rpm, engine cut-out, fuel pressure fault code. - !! Valve carbon buildup (GDi system) from 70,000 km
GDi direct injection no longer washes the intake valves with fuel. Carbon deposits impair gas exchange, leading to rough running and power loss.
Symptoms: Rough idle, hesitation on acceleration, increased fuel consumption, misfires on a cold engine. - !! Timing chain stretch from 120,000 km
Despite a robust roller chain, chain noise occurs from 100,000–150,000 km in many cases. In extreme cases the chain can jump and strike valves.
Symptoms: Rattling from the engine bay, particularly after cold start; check engine light from camshaft sensor fault.
+ 3 more engine weaknesses + vehicle weaknesses
Turbo direct-injection from the Gamma II family — 1.6L with 130–150 kW. Fuel dilution in engine oil is the biggest risk — frequent oil changes mandatory. Intake valve carbon buildup from GDI is a persistent theme. LSPI recall on some examples. Timing chain stretches under turbo load. The 7-speed DCT has its own class action for overheating and judder. Rod bearing wear documented as NHTSA recall.
- !! Fuel contamination of engine oil from 60,000 km
Fuel enters the engine oil via blow-by gases and a leaking high-pressure pump. Reduced oil viscosity leads to increased bearing wear and engine damage with long change intervals.
Symptoms: Petrol smell on the dipstick, dropping oil level between changes; oil consumption above 1 L per 1,500 km. - !! Turbocharger oil coking from 100,000 km
Turbocharger housing cokes up with incorrect cool-down procedure (switching engine off immediately) or poor oil quality. Oil leaks at the turbo from worn shaft seals are documented.
Symptoms: Blue smoke, whining noise from the turbocharger, power loss, oil consumption without visible external leak. - !! LSPI: pre-ignition at low rpm from 60,000 km
The G4FJ T-GDi is susceptible to Low Speed Pre-Ignition (LSPI) — uncontrolled self-ignition at low load. The event causes severe piston damage and engine failure. Hyundai updated the ECU and spark plugs as a remedy.
Symptoms: Loud knock or bang from the engine at low rpm/high load, check engine light
+ 5 more engine weaknesses + vehicle weaknesses
Two-litre naturally aspirated from the Nu family — Hyundai's most sold engine in the compact class. Notorious for the piston ring/cylinder bore problem: rings wear prematurely, bores get damaged — worst case engine destruction with fire risk. NHTSA recall 21V301 covers US 2019–2021 models. Timing chain stretches — cold-start rattle is the warning. Oil consumption is endemic — subject of US class actions. Water pump wears early. Regular oil level checks and short change intervals (8,000–10,000 km) are mandatory.
- !! Timing Chain Stretch and Jumping from 120,000 km
The timing chain stretches noticeably earlier under high-rpm use. The chain rarely breaks outright, but jumps frequently, causing valve-to-piston contact. With gentle driving, 300,000 km service life is possible.
Symptoms: Rattling on cold start, later also when warm; sudden engine damage from a jumped chain without warning. - !! Piston Ring Oil Consumption (Class Action Affected) from 80,000 km
The G4NA Nu is part of the class-action lawsuit against Hyundai for systemic oil consumption caused by defective piston rings. Oil scraper rings made from material that is too hard break and cause cylinder bore abrasion. Consumption can exceed 1 L/1,000 km.
Symptoms: Very high oil consumption, blue smoke, oil pressure warning, knocking - !! Recall 21V301: Nu Engine Piston Ring Scuffing — Stall/Fire from 60,000 km
NHTSA recall 21V301 affects 2019–2021 Kona, Elantra and Veloster with 2.0L Nu MPI: piston rings were not properly heat-treated — seized connecting rod bearing, engine block perforation and fire risk.
Symptoms: Knocking or rattling from engine; oil pressure warning light; sudden engine stall; in severe cases fire
+ 1 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Dual-clutch transmission: juddering and loss of drive The Tucson TL DCT shows lack of forward drive despite rising revs, juddering between 40–60 km/h and skipped gears. Hyundai has officially acknowledged gearbox problems. Symptoms: Juddering between 40–60 km/h, no drive despite rising revs, gears skipped from 60,000 km | High | |
| Manual gearbox – synchroniser rings worn On the Tucson TL with manual gearbox, synchroniser rings wear disproportionately quickly. Hyundai replaced revised parts as a goodwill gesture; outside warranty the owner bears the costs. Symptoms: Gear difficult to select, crunching when changing gear, gear pops out from 60,000 km | High | |
| Dual-clutch gearbox judders and jerks The optional dual-clutch gearbox shows juddering and power interruptions between 40–60 km/h. Vehicles with complete service history are less frequently affected; software updates often only help temporarily. Symptoms: Juddering when accelerating between 40 and 60 km/h, slipping despite rising revs, shift shocks when setting off from 50,000 km | High |
Test Reports
TÜV Report 2026
The Tucson TL achieves average MOT results with weaknesses at driveshafts and tie rods.
2025-11ADAC Breakdown Statistics 2025
The Tucson TL shows average breakdown figures in the compact SUV segment.
2025-04Top Reported Issues
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Known Problems and Issues +
A total of 55 weaknesses have been documented for the Hyundai Tucson TL-FL (2018–2020) — 32 engine-related and 23 vehicle-related. Typical issues affect Gearbox, Steering, Other, Interior.
Tucson (D4HA, 2015–2020) — Be Careful: Fuel in engine oil (diesel dilution), EGR valve fouling, DPF clogging. Power: 136 PS.
Tucson (D4HA, 2015–2020) — Be Careful: Fuel in engine oil (diesel dilution), EGR valve fouling, DPF clogging. Power: 185 PS.
Tucson (D4FE, 2018–2020) — Be Careful: EGR valve contamination, DPF regeneration fails on short trips, VTG turbocharger actuator seized. Power: 116 PS.
Tucson (D4FE, 2018–2020) — Be Careful: EGR valve contamination, DPF regeneration fails on short trips, VTG turbocharger actuator seized. Power: 136 PS.
Tucson (G4FD, 2015–2020) — Be Careful: High-pressure fuel pump failure, Valve carbon buildup (GDi system), Timing chain stretch. Power: 132 PS.
Tucson (G4FJ, 2015–2020) — Be Careful: Fuel contamination of engine oil, Turbocharger oil coking, LSPI: pre-ignition at low rpm. Power: 177–179 PS.
Tucson (G4NA, 2015–2020) — Be Careful: Timing Chain Stretch and Jumping, Piston Ring Oil Consumption (Class Action Affected), Recall 21V301: Nu Engine Piston Ring Scuffing — Stall/Fire. Power: 164 PS.
Tucson (G4NA, 2015–2020) — Be Careful: Timing Chain Stretch and Jumping, Piston Ring Oil Consumption (Class Action Affected), Recall 21V301: Nu Engine Piston Ring Scuffing — Stall/Fire. Power: 155 PS.
What to watch out for with the Hyundai Tucson? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
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Last updated: February 2026 · All information without guarantee