BMW i4 eDrive40 G26

The CCU handles conversion from AC to DC for home and public AC charging. Forum reports on i4talk.com document failures where AC charging stops working entirely while DC fast charging remains unaffected. BMW recalled certain 2022-2023 i4 models (NHTSA 23V-610) for improperly manufactured CCU components, covering approximately 69 vehicles. Outside the recall scope, CCU failures appear sporadically across model years. Symptoms include charging sessions that fail to initiate, repeated interruptions during AC charging, or inability to charge above a fraction of the 11 kW AC capacity. The CCU module costs approximately €2,500-3,500 including parts and labor. If the car is still within BMW's 3-year factory warranty or covered by the recall, replacement is free. Used buyers of 2022 models are likely outside warranty by now. If buying an i4, test AC charging during the viewing.

BMW has issued multiple battery-related recalls affecting the i4: improperly secured cell monitoring circuit connections (2023, NHTSA 23V-381), insufficient weld seams in battery modules (2024, NHTSA 24V-119 affecting certain 2024 models built Feb-Apr 2024), and battery ECU software causing power interruptions (2023, NHTSA 23V-044). When these faults occur, the car displays a drivetrain malfunction warning and can lose drive power, sometimes while driving at highway speed. BMW replaces affected modules free of charge under recall. Out of warranty and outside recall scope, a single battery module replacement costs approximately €1,500-2,000 per module, with the i4 containing four main modules. Multiple forum threads on i4talk.com document owners experiencing sudden drivetrain shutdown followed by cell module replacement at the dealer. Verify all recall campaigns have been completed using the VIN before purchasing any used i4.

In mid-2025, BMW recalled approximately 70,000 EVs including 2022-2025 i4 models (NHTSA 25V-395). The electric drive motor software may erroneously detect a double-isolation condition, triggering a complete high-voltage system shutdown approximately 15-20 seconds after a warning message appears. The car loses all drive power and the driver must coast to a safe stop. The fix is a software update, deliverable over-the-air or at a BMW dealer, at no cost. This is one of the more serious safety-related recalls because the loss of power occurs while driving. Verify this recall has been completed on any 2022-2025 i4 before purchase.

The i4, iX, and i5 share a heat changeover valve in the thermal management system that has been identified as a weak point. Cars built between approximately May 2023 and January 2024 are most commonly affected. The leak tends to appear in freezing temperatures, with the first sign being a loss of cabin heating. Green coolant may be visible under the valve area. If left unaddressed, the coolant loss can trigger drivetrain warnings as the thermal management system can no longer properly regulate battery temperature. An i4talk.com poll shows a notable percentage of owners with cars in this production window have experienced the issue. BMW has acknowledged it and many repairs have been covered under warranty or goodwill. Out of warranty, the valve replacement and coolant refill costs approximately €400-800 at an independent specialist and up to €1,200 at a BMW dealer. The issue appears to be more prevalent in Europe than in the US, likely due to colder operating conditions.

Like many modern EVs, the i4 uses a relatively small 12V battery that powers auxiliary systems including door locks, alarm, and the main computer. The car does not continuously charge the 12V battery from the main HV battery while parked. Systems like the alarm and Bluetooth module do not fully enter sleep mode, slowly draining the 12V battery. If it drops too low, the car will not unlock or respond to the key fob. Most owners report the car can sit for 2-4 weeks before this becomes an issue, but some experience it sooner, particularly in cold weather or if Connected Drive features are actively polling the car. A CTEK trickle charger is the recommended preventive measure for cars that sit for extended periods. Replacement of the 12V battery costs €200-350, and some owners report needing a replacement within 2-3 years. BMW software updates have improved power management on newer builds.

The i4 runs BMW's iDrive 8 system, which is feature-rich but not always stable. Owners commonly report frozen or black screens, CarPlay dropping mid-route, voice assistant delays, and connected services losing functionality after OTA updates. A particularly frustrating bug causes the navigation to dump back to the home screen after shifting from reverse to drive. BMW releases software updates roughly every 4 months via OTA, but some updates have been known to break previously working features. In rare cases, an OTA update has left the car in a non-operational state, requiring a dealer visit for manual reflash. Most software issues resolve themselves after a system reboot (hold the volume knob for 10 seconds) or the next OTA update. Head unit hardware replacement, if needed, costs approximately €250-350 but is rarely required. This is more of a daily annoyance than a safety concern, though losing navigation mid-trip is frustrating.

Some i4 owners report inadequate cabin heating, with the system blowing cold or lukewarm air for 10-20 minutes after a cold start. The i4 uses a heat pump combined with a PTC resistive heater for cabin heating and battery thermal management. When the heat pump compressor fails or a control chip malfunctions, the PTC heater may not take over properly. BMW dealers have resolved some cases by replacing chips in both the cabin and battery heating control modules. More serious failures involving the heat pump compressor or PTC heater unit run €800-1,500 for parts and labor. A software update has addressed some cold-weather heating logic issues. This problem primarily affects owners in colder climates and appears less common in temperate Western European conditions.

Some owners report a clunking or knocking noise from the front suspension when driving over larger bumps, potholes, or uneven surfaces. The noise can sometimes be felt through the steering wheel. BMW issued a Service Information Bulletin (SIB B32 01 23) for creaking noise from the front on cars with ThyssenKrupp electric power steering, with the fix involving retorquing specific bolts. Other causes include worn sway bar end links or upper strut mount bearings, both of which are common wear items on heavier EVs. Repair costs range from €200 for end link replacement to €600-800 for strut mount replacement per side at a BMW dealer. This issue tends to appear after 30,000-50,000 km and is more noticeable in the quiet EV cabin.