BMW X6 X6 M50i common faults.

2019–2023, SUV, petrol, 530 HP.

The fault list covers: N63B44T3 engine, ZF8HP75, ZF8HP90 transmission.

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5 fault write-ups. All are important. 11 recalls.

If you know the year, pick it. Faults for other years drop out of the list.

Before you buy

Known faults

5 important faults

critical2

N63 V8: failing piezo injectors and hydraulic lock in the cylinder

critical

On this engine the injectors were also listed as parts to be replaced in the maker's own programme, which means their failure is a known one. A faulty injector puts too much fuel into the cylinder. The liquid cannot be compressed, so the piston hits it on its way up: this is hydraulic lock, and it can damage the connecting rod bearing and the connecting rod as well. The early sign is rough running and hard starting. The fault can start from 60,000 km. The maker ran a separate programme for this engine, called the Customer Care Package, from December 2014. The franchised dealers had to check seven parts: the timing chain, the fuel injectors, the mass air flow sensor, the crankcase vent lines, the battery, the vacuum pump and the low pressure fuel sensor. These had to be replaced free of charge, even if the car had already fallen out of the four-year, 50,000-mile warranty. The same programme also shortened the oil change interval: 10,000 miles or one year instead of 15,000 miles or two years. Before buying it is therefore worth asking whether this programme was carried out on the car.

above 60,000 km

What to check

Ask whether the Customer Care Package was carried out, and whether the injectors were replaced
Start the engine cold and watch for hard starting and rough running
Read the fault memory and look for a code reporting a misfire on a specific cylinder

2 more steps in the write-up

N63 V8: a stretching timing chain and broken guides blocking the oil system

critical

The timing chain stretches between 80,000 and 120,000 km, and the plastic chain guides break. The broken pieces end up in the sump and block the lubrication system. From then on the engine is starved of oil, which takes the bearings and the turbochargers with it. The early sign is a metallic rattling from the front of the engine on a cold start. The stretching of the chain also features in the American class actions, alongside the extreme oil consumption. The maker ran a separate programme for this engine, called the Customer Care Package, from December 2014. The franchised dealers had to check seven parts: the timing chain, the fuel injectors, the mass air flow sensor, the crankcase vent lines, the battery, the vacuum pump and the low pressure fuel sensor. These had to be replaced free of charge, even if the car had already fallen out of the four-year, 50,000-mile warranty. The same programme also shortened the oil change interval: 10,000 miles or one year instead of 15,000 miles or two years. Before buying it is therefore worth asking whether this programme was carried out on the car.

between 80,000 and 120,000 km

What to check

Start the engine cold and listen for metallic rattling from the front of the engine
Ask whether the Customer Care Package was carried out, and whether the chain was replaced
Read the fault memory and look for a code reporting a camshaft position deviation

2 more steps in the write-up

expensive3

XDrive transfer case (ATC): binding in corners, plastic actuator gear

expensive

The heart of the four wheel drive in the longitudinal engine BMW X models (X3, X5 and the X1 E84) is the ATC transfer case. It has two faults, and you can feel both while driving.

Show the rest

The first is wear of the clutch pack and the fluid: in a slow, tight corner (a car park, a roundabout) the car jerks and "hops", as if the drive grabbed and let go. You can also get a jerk when pulling away on a slope. The second is the plastic actuator gear: the position signal is lost, the brake, ABS and 4x4/DSC lights come on together on the dash, and a clicking is audible from the transfer case when you switch the ignition off.

Workshops often propose a full transfer case replacement straight away. But the plastic gear can be replaced on its own, and the wrong tyre size or a mixed set of tyres also imitates the jerking, because the transfer case then slips continuously. So clear up the tyres and the fault code first, before you pay for a transfer case replacement.

between 72,000 and 175,000 km

What to check

In a slow, tight corner (a car park) watch for jerking, binding and a "skipping" feel
When pulling away on light throttle, can you feel the drivetrain jerk
Watch the dash: 4x4, ABS, DSC and brake lights together point at the actuator

4 more steps in the write-up

N63 V8: the valve stem seals leak and oil consumption is extreme

expensive

The valve stem seals start to lose their sealing from 90,000 km, and oil gets into the combustion chamber along the valve stem. The burning oil lays soot on the piston rings, they start to stick, and from then on the consumption grows further; the lubrication also gets tighter and the exhaust smokes. The scale of the consumption on this engine is extraordinary. In the American class action the plaintiffs report around one litre every 1,200 km, and one of them one litre every 1,600 km. In 2013 the maker issued a new oil consumption standard for this engine in a bulletin, and took the position that this is not a defect: according to it every one of its engines may use that much. The lawsuit points out that with this standard the owner has to top up the oil twenty times before reaching the factory 15,000-mile oil change interval. The maker ran a separate programme for this engine, called the Customer Care Package, from December 2014. The franchised dealers had to check seven parts: the timing chain, the fuel injectors, the mass air flow sensor, the crankcase vent lines, the battery, the vacuum pump and the low pressure fuel sensor. These had to be replaced free of charge, even if the car had already fallen out of the four-year, 50,000-mile warranty. The same programme also shortened the oil change interval: 10,000 miles or one year instead of 15,000 miles or two years. Before buying it is therefore worth asking whether this programme was carried out on the car. The repair means opening the cylinder head, and because of the V layout of the engine on both sides.

above 90,000 km

What to check

Ask how much oil has to be added between two changes, and ask for a figure
Ask whether the Customer Care Package programme was carried out, and ask for the confirmation
Read the service book: the shortened, one-year oil change cycle is expected here

2 more steps in the write-up

ZF 8HP automatic: mechatronics unit and connector sleeve leak

expensive

The ZF eight speed automatic (BMW Steptronic 8HP family) has two faults, and you can feel both.

Show the rest

The first is the mechatronics unit: the valve body and the control electronics in one. If the solenoids or the pressure regulation weaken, the gearbox jerks, the D/R engagement is delayed, it logs a gear ratio fault code, and finally drops into limp mode (often staying in 2nd or 3rd).

The second, and often misdiagnosed, is the connector sleeve of the mechatronics unit: the O-ring of the plastic sleeve ages, and ATF leaks from the side of the housing, exactly where the wiring harness enters. This is easy to mistake for a rear crankshaft seal. The trail starts from the driver's side of the housing, not from the clutch side.

On cars built in 2023 there was also a separate safety recall for a welding fault in the mechatronics unit. That is not the same as the wear related sleeve and the valves.

Check the fluid level, the area around the sleeve and the fault codes first; do not accept a "full gearbox replacement" quote straight away.

above 120,000 km

What to check

On the test drive watch for delayed D/R engagement, a jerk when shifting, and limp mode (a stuck gear)
Look at the driver's side of the gearbox housing where the wiring harness enters: an ATF trail from the sleeve is suspect
Do not confuse it with a rear crankshaft seal leak: the direction of the trail decides

3 more steps in the write-up

Official recall11 recallsShow

The manufacturer fixes these for free at a franchised dealer. Ask with the VIN whether it was done.

Most recent: 7 July 2026

SR/02180/26Safety recallFire7 July 2026 · EU Safety Gate

The RSW22 starter with reinforced water tightness (RWT) may experience increased abrasion of the magnetic contact, causing deposits to build up at the lowest point inside the relay. These deposits may increase relay contact resistance, leading to starting failures or short circuits. If a short circuit occurs, either when attempting to start the vehicle or while driving due to vibration-related movement of the deposits, it could cause a thermal event and increase the risk of fire. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: 07/07/2026

The authority's notice

SR/00568/26Safety recallFire30 January 2026 · EU Safety Gate

The failure concerns the RSW22 starter, type RWT (reinforced for watertightness). Increased abrasion of the magnetic contact can lead to the formation of deposits at the lowest point of the relay interior. This in turn can increase the resistance of the relay contact, causing accidental ignition or even short circuits, possibly leading to a thermal reaction and fire. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: 30/01/2026

The authority's notice

20V484000STRUCTURE:BODYSTRUCTURE:BODY14 August 2020 · NHTSA (USA)

BMW of North America, LLC (BMW) is recalling certain 2020 X6 sDrive40i, xDrive40i, X6 M50i and X6M vehicles. The rear spoiler may not be appropriately bonded to its mounting plate.

Risk: The rear spoiler on the roof may become loose, detach while driving, and could become a road hazard, increasing the risk of a crash, or injury to persons near the roadway.

Remedy: BMW will notify owners, and dealers will inspect the rear spoiler on the affected vehicles and replace them , if necessary, free of charge. The recall began October 14, 2020. Owners may contact BMW customer service at 1-800-525-7417.

The authority's notice

20V095000STRUCTURE:BODYSTRUCTURE:BODY19 February 2020 · NHTSA (USA)

BMW of North America, LLC (BMW) is recalling certain 2020 X6 sDrive40i, X6 xDrive40i, and X6 xDrive50i vehicles. The rear spoiler may detach.

Risk: If the spoiler detaches while driving, it can become a road hazard, increasing the risk of a crash.

Remedy: BMW will notify owners, and dealers will inspect and replace the rear spoiler, as necessary, free of charge. The recall began April 16, 2020. Owners may contact BMW customer service at 1-800-525-7417.

The authority's notice

A12/00031/21Safety recallInjuriesno date · EU Safety Gate

The upper rear (roof) spoiler may not have been properly attached during the production process. This may cause the spoiler to become detached, posing a risk to the following traffic.