Fiat Grande Punto 1.4 T-Jet

The electric power steering column on the Grande Punto is a well-documented weak point shared with the Fiat 500 and Punto Evo. The most common failure is the torque position sensor, which degrades over time and causes a groaning vibration when turning, eventually leading to complete loss of power assistance. The fault typically starts intermittently (steering goes heavy in one direction) before becoming permanent. A reconditioned column from a specialist costs around €400-600 fitted, while a new OEM unit from Fiat can exceed €900. Specialist rebuilders offer units with 2-year warranties. The issue typically appears after 60,000-100,000 km and is more common on cars that use the City Mode button frequently.

The rubber turbo-to-intercooler hoses and vacuum lines on the T-Jet are known to perish and split with age and heat cycling. When a hose fails, boost pressure escapes and the engine loses power significantly, often triggering limp mode and an engine management light. Symptoms include a loud whooshing noise under acceleration and black smoke from the exhaust. The OEM hose kit from Fiat is expensive (around €100-150), but silicone replacement hoses are available for €15-30 and are more durable. Vacuum hoses to the boost pressure sensor on the fan panel are also prone to splitting. This is an age-related issue that becomes increasingly common on cars over 8-10 years old.

The steel oil sump on the T-Jet engine has minimal factory corrosion protection and is notorious for rusting through. This affects the entire Grande Punto range and many other Fiat models of this era. Once the factory powder coating degrades, corrosion progresses quickly, especially on the leading edge exposed to road spray. A replacement sump costs €50-120 for the part, plus around €100-150 for fitting including new oil and filter. Preventive treatment with anti-rust paint or used engine oil wiped on the surface at each service can extend the sump's life significantly. If the sump becomes porous, oil seeps through the corroded metal and the oil level drops without a visible drip.

Coil spring breakage is one of the most common Grande Punto problems and a frequent inspection failure point across Europe. Springs corrode from road salt and stone chips, then snap under load. Breakage is most common in the lower coils where water and debris collect. Both front springs should always be replaced as a pair. Parts cost around €50-80 per pair (aftermarket), and fitting typically runs €100-200 depending on whether the top mounts also need replacing. Top mount bearings can also perish and crack, causing knocking noises over bumps. Springs typically last 5-8 years before becoming a risk.

The PCV (positive crankcase ventilation) system on the T-Jet is more stressed than on naturally aspirated versions because of turbo boost pressure. The PCV housing or cap can develop hairline cracks, allowing unmetered air into the intake and disrupting the fuel mixture. Symptoms include rough idle, misfires (codes P0171/P0172, P0300-P0304), increased oil consumption, and blue/white exhaust smoke. The part itself is inexpensive (€30-50), but diagnosing the fault can be time-consuming as symptoms mimic many other issues. Replacing the PCV cap or housing resolves the problem completely.

Beyond the sump, the front subframe and rear axle beam are also corrosion-prone on the Grande Punto. Surface rust progresses to structural corrosion after 10-15 years, especially on cars driven in areas with road salt. The subframe can rust through behind the wishbone mount on the passenger side. Mild surface corrosion can be treated with wire brushing and protective coating for under €100. If the subframe is structurally compromised, a new powder-coated replacement costs €400-800 including fitting. At that point, the repair may exceed the car's residual value.

A design flaw in the Grande Punto routes windscreen drain water directly onto the alternator. In winter, this water can freeze inside the alternator and destroy the bearings and internal components. Fiat acknowledged this with Service News 7002.10, issuing an extended drain tube that redirects the water away from the alternator. The deflector costs only €10-20 from a dealer. If the alternator has already been damaged, replacement costs €250-500 including a new or reconditioned unit and fitting. Check whether the drain extension has been fitted during a pre-purchase inspection.

The 1.4 T-Jet uses a coil-on-plug ignition system that can degrade with heat cycling. Connectors become brittle and wiring can break, causing intermittent misfires. Symptoms include rough idle, hesitation under acceleration, and the engine management light. A replacement coil costs €30-50 each, and spark plugs should be changed every 30,000 km on the turbo engine. This typically becomes an issue after 80,000-120,000 km. Using a diagnostic scan to identify which cylinder is misfiring saves time and money by targeting the faulty coil.