2021-2025 (G26) · 83.9 kWh battery, 335 hp electric motor, RWD
BMW's electric 4 Series Gran Coupe appeals to drivers seeking premium EV performance with traditional BMW dynamics. The eDrive40 offers 280-300 miles real-world range and impressive handling for an EV. Main concerns: coolant valve leaks (2023-2024 production), 12V auxiliary battery drain, charging port flap failures, and iDrive 8 software bugs. Multiple recalls for high-voltage battery and drive motor software. The 8-year/100,000-mile battery warranty provides solid protection, but be aware that build quality and software reliability lag behind Tesla's maturity.
Faulty valve leaks coolant, causes loss of cabin heat and drivetrain warnings · more· less
BMW issued a Technical Service Bulletin for i4, i5, and iX models built between May 2023 and January 2024 regarding coolant leaking from the heat changeover valve. First symptom is loss of cabin heating, followed soon after by drivetrain malfunction warnings. The leak typically occurs in freezing temperatures. During one documented repair, technicians accidentally activated the coolant pump and sprayed coolant throughout the interior of the opened battery compartment. Repair involves valve replacement and system refill. Some owners report heater failures shortly after valve repairs.
12V auxiliary battery drain/failure€250 - €500
Auxiliary battery drains when parked, sometimes fails completely requiring replacement · more· less
The 12V auxiliary battery (AGM 50AH) powers all vehicle electronics and can drain during extended parking periods. Some owners report complete battery failures leaving them locked out of the vehicle. In severe cases, a malfunctioning Combined Charging Unit (CCU) destroys the 12V battery, dropping voltage to 3V which is unrecoverable. Symptoms include starting issues, flickering dash lights, and multiple system failures. The car never fully enters sleep mode and any activity (opening hood, door, trunk) wakes the system. Replacement cost is approximately €290 including recalibration at a certified EV service center. Most owners can leave the car parked for 15 days or even 2 months without issues if the battery is healthy.
Charging port flap failure€350 - €500
Mechanical/electrical failure prevents flap from opening, no emergency release available · more· less
This is a known issue across BMW EV models including i4, i5, and iX. Service advisors report seeing "a bunch of i4s with this problem lately." The failure stems from a defect in the contact/locking pin, requiring replacement of the contact, surrounding socket, and charging flap assembly. Repair costs approximately €350 and takes 1.5-2 hours. The i4 has no emergency opener for the charging flap, which can be problematic if failure occurs when you urgently need to charge. Temporary workarounds include using lock/unlock sequences or applying light pressure on the flap while locking/unlocking. If under warranty, repair is covered by BMW.
iDrive 8 software crashes and bugs€0 - €200
Infotainment screen freezes, goes black, CarPlay drops connection, random reboots while driving · more· less
BMW i4 owners report frequent iDrive 8 system crashes including screens freezing, going completely black with only the BMW logo displayed, spontaneous camera view switching, and Apple CarPlay dropping connections or getting stuck on grey screens. Some users experience system crashes specifically when using Waze or wireless CarPlay. Software updates have been inconsistent - some improve stability while others introduce new bugs. Version 11/2023.73 caused permanent personal assistant screen display that couldn't be removed, while 07/2025.51 caused the car to forget drive configuration settings. Primary fix is pressing and holding the volume knob for 20-30 seconds until restart, or parking the car and letting it sleep for an hour. Most issues are software-related and don't require hardware replacement, but dealer diagnosis may incur €100-200 if out of warranty.
Manufacturing defects in battery modules can cause power loss, covered under recall and 8-year warranty · more· less
BMW recalled certain 2022-2025 i4 models (NHTSA Campaign 25V470) due to improperly assembled high-voltage battery cell modules. Excessive force during assembly may have stressed battery module frames, potentially causing frame failure and high-voltage system shutdown. Additional recall (22V944) addressed Combined Charging Unit (CCU) manufacturing defects with incorrect assembly that could lead to short-circuits. Some owners report "Drivetrain malfunction: Driving not possible" errors even on low-mileage vehicles (under 1,500 miles). All recall repairs are performed free of charge at BMW dealerships. The 8-year/100,000-mile battery warranty provides protection, though some reported repair bills exceeded €90,000 for full battery replacement (covered under warranty).
Electric drive motor software failure (recall)€0 (warranty/recall)
Software error may shut down high-voltage system unexpectedly causing loss of power while driving · more· less
BMW recalled over 70,000 EVs including 35,414 i4 units from 2022-2025 model years (NHTSA Campaign 25V395000) due to electric drive motor software that may unexpectedly shut down the high-voltage system. This can cause complete loss of drive power while driving. BMW will fix the software either at authorized dealerships or via over-the-air update. Some early i4s had metal flakes in the rear motor causing short circuits, later addressed by recall. All repairs are covered under warranty/recall at no cost to owners. Contact BMW customer service at 1-800-525-7417 to verify recall status.
Rear air suspension failure€1,200 - €3,500
Air springs leak, compressor fails, typically after 40,000-80,000 km · more· less
The i4 uses rear air suspension with known reliability issues. Owners report airbag failures as early as 19,000 miles (30,000 km), though most occur between 40,000-80,000 km. Symptoms include sagging or uneven ride height, dashboard warning lights, hissing sounds when adjusting suspension height, unusual compressor noises, and bouncy or rough ride. Compressor replacement costs approximately €1,200 for parts and labor. Full air suspension system replacement ranges from €2,000-€7,000 depending on extent of damage. Not all failures are expensive - some are just faulty cable connections (€95 fix) or ride height sensors. Note: Air suspension failures are explicitly excluded from BMW's extended "Power" warranty. The air suspension replaces only the springs, not the dampers.
Driver window won't retract for door closure, door handle communication fault · more· less
BMW i4 owners report driver's side window failures where the window doesn't retract the half-inch needed to fit into the slot when opening/closing the door, requiring users to slam the door with window stuck outside weatherstripping. Some failures traced to intermittent short of FAT LIN communication at the door handle, requiring complete outside door handle replacement (€400-800). Other cases linked to failing 12V battery not providing consistent power rather than actual mechanical window regulator problems. Many issues resolved themselves without intervention, or were fixed using BimmerCode to reset controllers. Water intrusion after car washing may contribute to failures. If actual window regulator replacement is needed, cost is €200-400 for parts plus €200-300 labor.
External sound generator control unit fault prevents pedestrian warning sound, safety issue · more· less
BMW recalled 1,988 2022-2023 i4 eDrive40 models (NHTSA recall 23V-026) built between November 11, 2021 and December 22, 2022 because the external artificial sound generator control unit may experience a fault during vehicle start-up and fail to generate required pedestrian warning sound. This violates FMVSS 141 Section 5 and increases risk of injury to pedestrians who rely on the sound to detect approaching vehicles. The issue was discovered when a factory worker noticed a 2023 iX sporadically failed to generate pedestrian warning sounds. Dealers will update the external artificial sound generator software free of charge, taking approximately one hour. Contact BMW to verify if your vehicle is affected.
Parking sensors and blind spot detection failures€150 - €600
Sensors stop working randomly, blind spot monitoring activates too late or not at all · more· less
Front parking sensors sometimes fail to engage when driving forward out of parking spots, also preventing automatic camera activation. Issues often resolve after vehicle restart, suggesting software bugs. Some failures traced to loose sensor connections (€50-100 fix). Blind spot monitoring system receives frequent complaints - activates too late even when set to "early" with the adjacent car basically overlapped before warning appears. The BSM range is described as "very narrow" and owners report it as "the weakest" compared to other vehicles. System randomly stops working for entire drive cycles, only resuming after parking and restarting. The BSM primarily activates when cars approach from behind in adjacent lanes, not when passing cars. Sensor replacement costs €200-400 per sensor, control module replacement €400-600.
Good EV powertrain, concerning build quality and software reliability
The i4 eDrive40's electric drivetrain and battery are relatively robust with strong warranty protection (8 years/100,000 miles). However, numerous software bugs, multiple recalls affecting critical systems, and quality control issues with coolant valves, charging flaps, and 12V batteries indicate BMW's electric vehicle execution lags behind more mature EV manufacturers. Most issues occur under warranty, but the frequency of problems may frustrate owners expecting typical BMW build quality.
Pre-Purchase Inspection Checklist
General checks
Service history
Complete BMW dealer or certified EV specialist records essential. Verify all recalls completed.
Tires
Check tread depth (minimum 3mm), age via date codes (max 6 years old), and uneven wear patterns. EVs are heavy and wear tires faster.
Battery health report
Request BMW Car Data Report showing battery capacity degradation. Should be above 95% for cars under 3 years old.
Cold start test
Power on with vehicle cold. Check for warning lights, software errors, all systems functioning.
Test drive
Minimum 30 minutes including highway speeds. Verify regenerative braking, acceleration response, no drivetrain warnings.
Specific for this vehicle
Verify all recalls completed via VIN check
Critical: electric drive motor software (25V395000), battery modules (25V470), pedestrian warning sound (23V-026). Contact BMW at 1-800-525-7417 or check NHTSA.gov.
Test charging port flap operation
Open and close the charging flap multiple times. Should operate smoothly without sticking or hesitation. This is a common failure point with no emergency release.
Check for coolant leaks under vehicle
Inspect ground under battery area for coolant spots. Test cabin heater at maximum temperature for at least 10 minutes - should blow hot air immediately. Loss of heat indicates valve failure.
Test 12V auxiliary battery voltage
Have mechanic measure 12V battery voltage with multimeter - should be 12.6V or higher when fully charged. Check for any electrical glitches, flickering displays, or slow system wake-up.
Test all iDrive 8 functions thoroughly
Spend 15 minutes testing infotainment: navigation, CarPlay/Android Auto connection, climate controls, camera views. Watch for screen freezing, black screens, or system reboots.
Inspect air suspension for leaks or sagging
Check ride height is even side-to-side. Listen for hissing sounds. Test suspension height adjustment if equipped. Look at damper bodies for oil misting.
Test all window operations and door handles
Verify driver's window retracts properly when opening door. Test all windows up/down multiple times. Check digital door handles respond quickly.
Test parking sensors and blind spot monitoring
Verify front/rear sensors activate correctly. Drive with adjacent traffic to test blind spot detection - note it activates late compared to other brands.
Check production date for coolant valve recall window
Cars built May 2023 - January 2024 are most affected by coolant valve issues. If in this window, ensure repair documented.
Verify brake rotor condition
EVs use brakes less due to regen, causing rust buildup. Inspect rotors for excessive rust or pitting. Should be smooth and clean.
Recalls and Technical Service Bulletins
Electric drive motor software (25V395000)2022-2025 models
Combined Charging Unit (CCU) defects2022-2023 models
TSB: Coolant leak at changeover valveMay 2023-Jan 2024 production
The i4 has had 7 recalls for 2023 model year alone. Contact BMW customer service at 1-800-525-7417 with your VIN to verify all recalls have been completed. You can also check www.nhtsa.gov/recalls. All recall repairs are performed free of charge.
Warranty Status
New vehicle warranty4 years / 50,000 miles
High-voltage battery warranty8 years / 100,000 miles
The 8-year/100,000-mile high-voltage battery warranty covers defects in materials and workmanship, and guarantees minimum 70% capacity retention. This warranty transfers to second owners. However, BMW's extended "Power" warranty explicitly excludes oil leaks (including air suspension leaks), so air suspension failures are not covered even under extended warranty. The battery warranty does not cover degradation above 70% unless caused by manufacturing defects.
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.