News

What the 28231-2B760 turbo actually is

Your Tucson TL 1.6 T-GDI runs a BorgWarner B01 turbo. It is a K03-family unit with a twin-scroll housing and an electronic wastegate. Twin-scroll means exhaust pulses reach the turbine in two separate channels, which cuts lag on a small 1.6-liter engine.

Hyundai's number for the complete assembly is 28231-2B760. Parts catalogs list 28231-2B810 as the later service number. The numbers that matter:

• Complete turbo: 28231-2B760, later superseded by 28231-2B810.
• BorgWarner CHRA-and-housing assembly: 16399980016 or 16399880016.
• Electronic wastegate actuator: 39400-2B260 (BorgWarner 59001107318). The later 39400-2B270 pairs with 28231-2B810.
• Same engine family: the Kia Sportage 1.6 T-GDI and the turbo Elantra Sport.

Need the assembly itself? Our complete 28231-2B760 turbocharger for the 2016-2017-2018 Tucson 1.6L is that exact unit, sold as a direct-fit replacement.

P0299 on the Tucson 1.6T: check parts in this order

P0299 means the ECU asked for a boost level and measured less than it got. The ECU is your car's control computer. Work the four causes below in sequence, because the most common fault is also the cheapest to fix.

1. The electronic wastegate actuator — the known weak point

Start here. The actuator is the small electric motor that opens and closes the wastegate, the valve that vents exhaust away from the turbo. It is the most commonly documented failure on the G4FJ, and it triggers codes such as P0243 and P0299.

You can test it without removing the turbo:

• Turn the ignition on, engine off.
• Read the actuator position signal. It should sit near 1.7 volts with the wastegate closed.
• Command it open. The signal should rise toward about 3.8 volts.
• No sweep, or a rattling gear noise from the actuator? The actuator is your fault.

The actuator is a separately replaceable part. Replace it alone and the boost fault clears on many cars, as long as the compressor wheel shows no shaft play. The same replace-the-actuator logic applies to other Hyundai turbo engines, like the wastegate actuator 39400-2GTA0 for the 2015-2021 Santa Fe and Kia Optima.

2. Boost leaks — the cheap cause

Smoke-test the charge system before you order any part. A leak releases exactly the air the ECU asked for, so the shortfall reads as underboost. Look at three places:

• Cracked charge pipes.
• Split intercooler hoses.
• Loose clamps.

A smoke test finds these in minutes. Guesswork replaces good parts for weeks instead.

3. Oil starvation — the expensive cause

Check the engine oil level before any boost-system work. The G4FJ is known for oil consumption, and a turbo spinning at six-figure RPM on a low oil supply scores its bearings first. The damage arrives in order:

• A new whine from the turbo.
• Shaft play at the compressor wheel.
• Metal contact. At this point the cartridge is done.

One documented 2016 Tucson case paired P0299 with bearing damage from low oil. If the compressor wheel has visible shaft play or chipped blades, the cartridge is finished no matter what the actuator does.

4. Coked oil feed and carboned wastegate — the slow causes

Two slower killers sit between a hose and a dead cartridge:

• A carbon-clogged oil feed line throttles lubrication over time. Inspect or replace it with any turbo job.
• Carbon on the wastegate flap or linkage holds the gate partly open. That reads as underboost with everything else healthy.

The sensor half of the boost equation

Boost control is a closed loop. The ECU commands a manifold pressure and believes whatever sensor reports it. A drifted MAP sensor under-reads, so the logs look like a mechanical fault that is not there.

Compare the sensor against a hand gauge before you buy any hardware. The same reporting role exists across every turbocharged Hyundai and Kia through the Hyundai/Kia turbo MAP boost pressure sensor family, and on Honda's turbo 2.0 through the OEM turbo boost MAP sensor for the Civic 2.0L. For modified GM engines, our GM 3-bar MAP sensor 12592525 guide shows how sensor range and boost targets interact.

What to replace with the turbo, if it comes to that

A new turbo only lasts as long as its surroundings. Do these four things with the swap:

• Fresh oil and filter. Contaminated oil is what killed the old cartridge in many cases.
• Inspect or replace the oil feed line. Coking inside it kills the new unit the same way.
• Test the actuator with the ignition-on voltage sweep before reassembly.
• Look at intake valve carbon. Direct injection builds it up regardless of the turbo's condition.

The same replacement discipline applies on other platforms, as our Ford F-150 EcoBoost 3.5L turbo replacement guide shows step by step. Everything in the boost and engine family sits in the Engines & Engine Parts collection. For the background on how these turbos got here, read our overview of new turbocharger technologies.

Frequently asked questions