B1325 on BMW i4: Fix & DLC Location
Factory diagnostic troubleshooting wire for fault code B1325 (B1325: Device Power 1 Circuit Voltage Below Threshold (BCM)) specifically on the BMW i4 (2022–2026, Single / Dual Motor EV (eDrive35, eDrive40, M50 536HP)).
1. Symptoms of B1325 on BMW i4
When the Engine Control Module (ECM/PCM) on your BMW i4 (Single / Dual Motor EV (eDrive35, eDrive40, M50 536HP)) logs fault code B1325, drivers commonly observe:
2. Most Likely Causes on BMW i4
Historical warranty claims and technical repair bulletins for BMW i4 point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for BMW i4
Interface with the diagnostic port or system console using verified scanning hardware. Record freeze-frame data, active sub-codes, and timestamps to isolate whether B1325 is static or intermittent. on the BMW i4 equipped with Single / Dual Motor EV (eDrive35, eDrive40, M50 536HP).
Visually inspect the physical component (Main BCM Ground Wire), connector pins, and associated wiring harnesses for signs of corrosion, thermal melting, or loose grounding clips. on the BMW i4 equipped with Single / Dual Motor EV (eDrive35, eDrive40, M50 536HP).
Measure reference voltages and resistance thresholds against manufacturer factory specifications. Replace any component failing nominal impedance tolerances. on the BMW i4 equipped with Single / Dual Motor EV (eDrive35, eDrive40, M50 536HP).
Install genuine OEM replacement hardware or execute registry / service commands. Ensure all mounting bolts are torqued to factory specifications. on the BMW i4 equipped with Single / Dual Motor EV (eDrive35, eDrive40, M50 536HP).
Erase the fault code from non-volatile memory. Perform a standard verification cycle (e.g. 15-minute mixed drive or system stress benchmark) to ensure monitors reset to 'Ready' state without recurrent fault flags. on the BMW i4 equipped with Single / Dual Motor EV (eDrive35, eDrive40, M50 536HP).
Other Common Fault Codes on BMW i4
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the BMW i4:
4. BMW i4 B1325 FAQs
What causes code B1325 to trigger on a BMW i4?
On the BMW i4 (Single / Dual Motor EV (eDrive35, eDrive40, M50 536HP)), B1325 is most frequently caused by Component aging, oxidation, or degraded internal circuit element (Main BCM Ground Wire) or Wiring harness abrasion, loose terminal pin, or ground voltage float.
Where is the OBD-II port located on my BMW i4?
On the BMW i4, the 16-pin DLC diagnostic connector is located Under driver steering column OBD interface. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my BMW i4 with code B1325?
Caution. Limited operation permitted only to reach a nearby repair facility or backup critical personal files. Given that B1325 carries a High severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.