Hyundai H-1
Workhorse diesel built for commercial duty. Stacks of torque, long-lived if maintained, but injector bills can sting.
Work van, end of story
The H-1 TQ is a tool for moving people and cargo. Spacious, reliable, dynamically dead.
Engine Weaknesses 6
Leaking injectors allow carbon to enter the crankcase. Sooty deposits block the oil pick-up strainer in the sump. Result: turbocharger and engine damage from oil starvation.
Symptoms: White/blue smoke, poor cold start, rising oil level due to fuel contamination, engine knocking.
Oil contaminated by injector leakage clogs the turbocharger oil supply. The turbo seizes without clean lubrication, often simultaneously with engine lubrication problems.
Symptoms: Whistling or rattling from turbocharger, severe power loss, black smoke, engine oil on compressor wheel.
Leaking injector copper washers allow combustion gases into the oil. The resulting residues clog the oil strainer and block turbo oil supply — the most common cause of engine failure in the H-1.
Symptoms: Blue smoke, rising oil viscosity, turbo noise, dropping oil pressure, check engine light.
The boost pressure relief valve on the D4CB can fail and cause uncontrolled overboosting. This leads to engine damage and can destroy the turbo's compressor wheel.
Symptoms: Howling turbo noise at full load, black smoke, check engine light, power surges on acceleration.
The EGR valve and cooler on the 2.5 CRDi are prone to soot deposits. Especially in urban and short-trip use; van operation encourages frequent cold starts.
Symptoms: Check engine light, power loss, black exhaust clouds, increased consumption.
The mass airflow sensor on the D4CB gets contaminated by oil mist from the crankcase ventilation. Incorrect MAF signals lead to wrong injection quantity and increased consumption.
Symptoms: Hesitation under moderate load, increased consumption, rough idle, fault code P0101/P0102.
Vehicle Weaknesses 8
The H-1 TQ rusts through at sills, wheel arches, and underbody components. After 6 years, sills can be completely rusted through from wheel arch to wheel arch. Repair costs up to approximately €1,400.
The 2.5 CRDi turbocharger on the H-1 TQ is susceptible with frequent short-trip use and overdue filter changes. Particles from a blocked DPF can damage injectors and the turbo.
The turbocharger on the 2.5-litre diesel tends to fail at high mileages and with frequent short-trip use. Spare parts often have to be imported from Korea, leading to long standstill periods of several weeks.
The tailgate and rear body parts of the H-1 TQ show early corrosion, especially at folds and bolted connections. Typical for vehicles without regular preservation.
The electric sliding doors of the H-1 TQ frequently develop mechanical problems. Unlock buttons only open halfway, doors can no longer be unlocked electrically. In cold weather, handles and mechanisms also jam.
From around 6 years old, the H-1 TQ shows rust at sheet metal overlaps, door frames, wheel arches, and frame parts. Bolt heads rust and can channel water into cavities. Underbody treatment is therefore important.
The air conditioning in the H-1 TQ regularly loses refrigerant through micro-leaks. Rattling noises and lack of cooling are typical symptoms. Refrigerant recharging is frequently required.
Doors and interior panels in the H-1 TQ creak and rattle with age. Disturbing noises occur particularly on poor roads. Door seals harden and lose their sealing function.