The G45 is a ground-up redesign of BMW's best-selling SUV. The M50 uses the latest B58B30M2 inline-six with 375 hp (EU spec) and a 48V mild hybrid starter-generator, paired with the ZF 8-speed automatic and xDrive all-wheel drive. The B58 engine family has a strong reliability reputation across the BMW range, with many examples exceeding 200,000 km. Being a first-year production model, the G45 has accumulated a high number of service bulletins and recalls, predominantly related to software, electrical trim items, and minor assembly issues rather than fundamental mechanical concerns.· more· less
Proven B58 inline-6, strong track record
Refined ZF 8HP, polished chassis
High first-year TSB and recall count
iDrive 9 software still maturing
Buy if: You want a fast, refined performance SUV with a proven engine and can tolerate occasional dealer visits for software updates during the early ownership years.
Avoid if: You expect trouble-free ownership from day one or are uncomfortable buying a first-year production model with ongoing software refinements.
Common Problems
Plastic oil filter housing develops internal coolant leaks, a known B58 weak point across all models · more· less
The B58 engine family uses a plastic oil filter housing with integrated coolant passages. Over time, the sealing gasket and the housing itself degrade from repeated heat cycling, causing coolant to leak externally or, in worse cases, to mix with engine oil. BMW issued SIB 11 10 25 specifically for the G45 addressing this issue. A class-action lawsuit has been filed covering B46, B48, and B58 engines for premature oil filter housing failures. On the B58, problems typically appear between 60,000 and 120,000 km. Independent repair costs around €1,200-1,800 including a new housing and gasket. BMW dealer replacement runs €2,000-3,000. Some owners upgrade to aftermarket aluminum oil filter housings as a preventive measure.
Widespread infotainment glitches including screen flickering, Bluetooth disconnects, settings not saving, and voice assistant failures · more· less
The G45 launched with iDrive 9 (Operating System 9), and BMW has issued over 20 software-related service bulletins for this system within the first 18 months of production. Reported issues include central display flickering without stored faults (SIB 65 35 24), Bluetooth devices deleting themselves after sleep cycles (SIB 65 16 25), voice assistant becoming unresponsive (SIB 65 09 26), Android Auto connectivity failures (SIB 65 10 25), climate sync settings not saving, and navigation voice language changing unexpectedly (SIB 65 12 26). A catch-all bulletin (SIB 65 27 25) addresses multiple infotainment issues including resets, delays, and connectivity failures across 2025-2026 models. Most fixes are software updates performed at no charge under warranty. Post-warranty, dealer software updates typically cost €100-500 per visit.
Bump stop detaches from strut top mount, causing cold-weather creaking over bumps and speed humps · more· less
BMW issued multiple service bulletins for front suspension noises on the G45: SIB 31 01 26 addresses thumping and groaning from the front axle caused by the bump stop (auxiliary damper) detaching from the strut top support bearing, and SIB 31 02 26 covers a click-type noise from the front axle control arm under load. The bump stop issue requires replacing both strut bearing plates and both front bump stops, with windshield adhesive used to secure the bump stops to the new top mounts. Multiple owners on Bimmerpost have confirmed this fix resolves the noise. Under warranty this is covered at no cost, but out-of-warranty the parts and labor run €400-1,200 depending on the extent of repairs needed. The issue is more noticeable in cold weather.
Jerking or shuddering during low-speed cornering or gentle acceleration, a known xDrive issue carried over from previous generations · more· less
SIB 27 02 20, originally issued for earlier BMW xDrive models, has been extended to cover the G45. The transfer case can develop shudder during low-speed manoeuvring, tight turns, or gentle acceleration without any warning lights. The cause is either factory-fill transfer case oil that does not meet BMW specifications, or clutch plate wear from uneven tire wear. The prescribed fix is a transfer case fluid change using BMW DTF-1 fluid followed by software recalibration, costing €200-400 at a BMW dealer. This resolves the issue in most cases after a break-in period of roughly 200 km. If the clutch plates are already damaged, full transfer case replacement costs €3,000-4,000. A class-action lawsuit has been filed in the US over this issue across multiple BMW xDrive models.
Starter-generator connection recalled, 48V battery and DC-DC converter are potential future failure points · more· less
BMW recalled 4,557 G45 X3 vehicles (Recall 25V202) because the connection between the positive battery cable and the starter-generator may not have been properly tightened during assembly, potentially causing overheating. An additional recall (25V109) covering 114 vehicles addresses the same issue. These are manufacturing-specific problems affecting early production cars. The 48V system introduces a DC-DC converter (Power Control Unit) that interfaces between the 48V and 12V electrical systems. If the 12V battery drops below a critical threshold while the vehicle sleeps, it can trigger a discharge cycle that drains both batteries. Replacing the DC-DC converter or starter-generator module costs €800-1,500 at a dealer. Keeping the 12V battery healthy and the car regularly driven prevents most 48V system problems.
Expansion tank, water pump housing, and coolant hoses use plastic that becomes brittle with heat exposure · more· less
The B58 engine uses thermoplastic materials for the coolant expansion tank, electric water pump housing, and thermostat housing. Under the high operating temperatures of the turbocharged engine, these plastics degrade through repeated heat cycling. BMW issued SIB 17 06 24 for the G45 specifically addressing a coolant line making contact with the belt tensioner pulley, which can wear through the hose. The electric water pump typically fails between 80,000 and 120,000 km on B58 engines. Replacement costs €600-900 for the water pump assembly including labor. The expansion tank costs €200-400. Proactive replacement of plastic coolant components around 80,000 km is widely recommended by BMW specialists as preventive maintenance.
Software may not detect torque sensor fault, causing unintended steering wheel movement while stationary · more· less
BMW recalled 36,922 model year 2025-2026 X3s (Recall 25V857) for steering control software that may not sufficiently detect a torque sensor malfunction. If one of two channels in the steering torque sensor fails while the vehicle is stationary, the software may not diagnose it correctly, potentially resulting in unintended steering wheel movement during startup. BMW was aware of 21 reported cases with no injuries. The fix is a free software update available over-the-air or at a dealer. This is a one-time correction with no recurring cost, but buyers should verify the recall has been completed via VIN.
Proven engine, but first-generation platform still being refined
The B58 inline-six at the heart of the X3 M50 has a strong reliability record across multiple BMW models and generations. The core mechanical package is well proven. However, the G45 is a first-year platform with a new electrical architecture, 48V mild hybrid system, and iDrive 9 software that is still maturing. BMW has issued over 80 service bulletins and 8 safety recalls in the first 18 months of production, mostly for software, electrical trim, and minor assembly issues rather than fundamental mechanical failures. Buyers should ensure all recalls are addressed and keep software up to date.
Recalls and Technical Service Bulletins
Steering system software: unintended wheel movement while stationary (25V857, 36,922 vehicles, Aug 2024 - Oct 2025 build)
Verify completed
Starter-generator battery cable connection may loosen and overheat (25V202, 4,557 vehicles)
Critical - verify completed
Rear brake hoses improperly crimped, risk of brake fluid leak and ABS/DSC loss (25V154, 192 vehicles, Feb 2025 build)
Critical - verify completed
Positive battery cable connection may overheat (25V109, 114 vehicles)
Verify completed
Front brake discs damaged during transport (25V247, 26 vehicles)
Verify completed
Front passenger airbag fabric damaged during transport (24V772, 7 vehicles)
Verify completed
Front wheel bearing may crack (24V909, 2 vehicles)
Verify completed
Right-side head curtain airbag assembly defect (24V856, 2 vehicles)
Verify completed
The G45 X3 has accumulated 8 safety recalls in its first 18 months of production. While most affect small numbers of vehicles, the steering software recall (25V857) applies to nearly 37,000 cars built between August 2024 and October 2025. Contact BMW with the VIN to verify all recalls have been completed. The steering recall can be resolved via over-the-air update.
Warranty Status
Factory warranty (3 years with 2+1 programme)
Most 2024-2025 cars still within warranty
Rust perforation warranty (12 years)
Active on all G45 X3s
48V battery and mild hybrid components
Covered under standard factory warranty
BMW Service Inclusive packages
Available for extended maintenance coverage
Most G45 X3 M50s are still within BMW's 3-year factory warranty (2+1 programme active since November 2016). The 48V mild hybrid battery and associated components are covered under the standard warranty. Given the high number of first-year service bulletins, purchasing a car still within warranty is strongly recommended for the G45.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
