2025 BMW X5 MIL with Fault 0318E2 After Charging

Owners of certain 2025 BMW plug-in hybrid electric vehicles (PHEVs) may experience a Malfunction Indicator Lamp (MIL) illuminating on their dashboard, accompanied by the diagnostic fault code 0318E2 AC charging, charging electronics 1, component protection: Overload current on AC side after AC charging. This issue, addressed by BMW Service Information Bulletin (SIB) 61 23 25, specifically affects vehicles equipped with a CCU-03 (7.4 kW combined charging unit).

Despite the fault memory entry and the illuminated MIL, the AC charging process continues to operate as designed, and there are no related drivability complaints. The vehicle's functionality is not impaired, and the charging system is working as intended to protect itself from overcurrent.

Symptoms

Owners will primarily notice two key symptoms related to this issue:

• The malfunction indicator lamp (MIL) illuminates on the instrument cluster.
• A diagnostic fault code 0318E2 AC charging, charging electronics 1, component protection: Overload current on AC side is stored in the vehicle's fault memory.

Fault Codes / DTCs

The primary fault code associated with this issue is:

• 0318E2: AC charging, charging electronics 1, component protection: Overload current on AC side

Diagnosis / Trigger Conditions

The root cause of the 2025 BMW X5 fault 0318E2 is the use of a non-genuine BMW Level 1 (120V) high-voltage (HV) charger. While the vehicle's Combined Charging Unit (CCU) is designed to limit charge current to 12 Amps, some aftermarket chargers can supply up to 16 Amps. This higher current is detected by the CCU as an overload, leading to the storage of the fault code and the illumination of the MIL.

Interim Solution and Recommended Actions

For vehicles exhibiting the 2025 BMW X5 fault 0318E2, technicians should first determine the vehicle's current I-level using the AIR system or the Key Reader/Aftersales Workplace (AWP) application. If the vehicle's I-level is lower than ...26-03-500, a software update to correct this issue is not yet available.

In such cases, technicians are instructed to clear fault code 0318E2 and inform the customer about the situation. It is recommended that customers use the genuine Level 1 (120 VAC) BMW charger (Flexible Fast Charger - FFC) supplied with the vehicle. Alternatively, upgrading to a Level 2 (240 VAC) FFC 14-50 adapter or a hard-wired BMW Wall Box is advised to prevent overcurrent conditions.

If a customer chooses to continue using a non-BMW Level 1 (120 VAC) charger with higher current, they should limit the charge current strength in the vehicle's iDrive menu charging settings to a maximum effective charge current of 12 Amps. This adjustment should be maintained until the I-level ...26-03-500 software upgrade becomes available.

Important Warnings for Owners

BMW has provided several critical advisories regarding this issue:

• "Please do not proceed; the ISTA version with the update that corrects this software issue is expected to be available as of March 2026."
• "Until ISTA I-level 26-03-500 'software upgrade' is available, this issue (malfunction indicator lamp (MIL) and fault 0318E2) can occur multiple times if the customer continues to use a higher output non-BMW Level 1 (120VAC) charger."
• "Exchanging the CCU will not eliminate the problem and is therefore not permitted."
• "Do not replace any parts, as it does not provide a remedy and is therefore not permitted."
• "There is no operational problem with the vehicle."
• "That a software update is expected in March 2026."
• "The vehicle should be released back to the customer, and it should be documented in the repair order so that the customer was informed of the situation."
• "If a customer refuses to pick up his/her vehicle, the area team should be contacted immediately. Vehicles should not sit at the dealership awaiting the software update."

Warranty and Repair Information

This issue is covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks, as well as state-specific Emissions Warranty provisions. The repair code associated with this issue is 6144023700 for the "CCU Combined Charging Unit control unit (Hybrid/E-vehicle) Loose" (though the issue is software-related, this code is used for documentation).

Technicians should reference the SIB number, SIB 61 23 25, and the issue (e.g., "B61 23 25 CCU software update release pending") in their repair order notes and claim comments. For documenting diagnosis work time, refer to SI B01 01 20 or B01 07 20.

Applicable labor operations include:

Labor Operation	Description	Labor Allowance
00 00 006	Carrying out vehicle test (Main work)	As applicable
00 00 556	Carrying out vehicle test (Plusposition)	As applicable
61 21 528	Supporting voltage of the vehicle electrical system / recharging vehicle battery	As applicable
61 00 006*	Carrying out vehicle diagnosis, ABL (Work time)	WT FRU
00 58 500*	Diagnosis Worktime Flat Rate	2 FRU

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Source: NHTSA ID: 10248834, SIB 61 23 25