BMW F34 3 Series Gran Turismo Faults (2014–2019) and Their OEM Fixes

The F34 3 Series Gran Turismo (2014–2019) is the practical odd one out of the F3x family: a longer wheelbase, a hatchback tailgate and more glass than a saloon. Mechanically it shares most of its hardware with the F30, so the engine and chassis wear the same way — but the body, the roof and the powered tailgate bring their own list. Here is what we see most on the GTs we part out, with genuine used OEM parts from our rust-free Texas yard.

1. The panoramic roof and its drains

The GT carries a large glass roof, and the cassette under it has drain channels running down the pillars. Leaves and grit block them, water backs up, and the first sign is usually a damp headliner or a wet footwell rather than a dripping roof. Clearing the drains is maintenance; when the frame, rails or shade mechanism are already damaged, a complete used cassette is far cheaper than the individual pieces.

In stock · Kaufman, TXBMW F34 328i 340i GT Sunroof Frame, Rails and Sun Shade — OEM$498.00View part →

2. Body control and comfort electronics

Lighting, central locking, comfort access and the powered tailgate all answer to the front body module. When it fails, the symptoms scatter: doors that lock at random, lights that behave oddly, a tailgate that opens when it feels like it. Diagnosis at a dealer usually costs more than the module itself, and a matching used unit coded to your car is the practical fix.

In stock · Kaufman, TXBMW F34 328i GT Front Body Control Module (FEM) — OEM$124.50View part →

3. Rear wheel bearings and knuckles

The GT is heavier than the saloon and carries more of that weight over the rear axle. Rear wheel bearings are the usual consequence: a hum that rises with speed and changes when you lean the car into a bend. The bearing is pressed into the knuckle, so a complete used knuckle with a good bearing saves the press work and the guesswork.

In stock · Kaufman, TXBMW F34 328i 335i 340i GT Rear Left Knuckle with Hub — OEM$116.20View part →

4. Cooling: plastic first, metal later

On the N20 and N26 cars the cooling system is mostly plastic — thermostat housing, hose connectors, expansion tank. They go brittle with heat cycles and crack at the seams, usually losing coolant slowly with nothing visible on the driveway. If the fan runs hard or the temperature needle wanders, look at the fan module as well: it is a controlled unit and fails electrically as often as mechanically.

In stock · Kaufman, TXBMW F34 328i 340i GT Radiator Cooling Fan Motor — OEM$136.95View part →

5. Early N20 timing chains

The early four-cylinder N20 cars have a well-documented timing chain concern; BMW revised the parts on later engines. If you are buying a high-mileage GT, listen for a rattle on cold start and check the service history for chain work. It does not make the car a bad buy — it makes the history worth reading.

6. The tailgate is not a boot lid

The powered tailgate has its own drive, struts, latch and sensors, and the parts are not shared with the F30 saloon. When ordering, make sure the piece is listed for the Gran Turismo specifically — the same year and engine badge is not enough.

Looking for a part we do not have listed?

We part out F34 GTs as they come through the yard, so if you do not see your piece on the site yet, it may already be on the shelf. Send your VIN or call +1 (903) 914-0004 and we will match the exact OEM part for your BMW before you buy. For the saloon version of this chassis, see our F30 3 Series guide.