B1325 on Ford Mustang: Fix & DLC Location
Factory diagnostic troubleshooting wire for fault code B1325 (B1325: Device Power 1 Circuit Voltage Below Threshold (BCM)) specifically on the Ford Mustang (2020–2026, 5.0L Gen 4 Coyote V8 (480HP–500HP Dark Horse) / 2.3L High Output EcoBoost).
1. Symptoms of B1325 on Ford Mustang
When the Engine Control Module (ECM/PCM) on your Ford Mustang (5.0L Gen 4 Coyote V8 (480HP–500HP Dark Horse) / 2.3L High Output EcoBoost) logs fault code B1325, drivers commonly observe:
2. Most Likely Causes on Ford Mustang
Historical warranty claims and technical repair bulletins for Ford Mustang point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Ford Mustang
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 Ford Mustang equipped with 5.0L Gen 4 Coyote V8 (480HP–500HP Dark Horse) / 2.3L High Output EcoBoost.
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 Ford Mustang equipped with 5.0L Gen 4 Coyote V8 (480HP–500HP Dark Horse) / 2.3L High Output EcoBoost.
Measure reference voltages and resistance thresholds against manufacturer factory specifications. Replace any component failing nominal impedance tolerances. on the Ford Mustang equipped with 5.0L Gen 4 Coyote V8 (480HP–500HP Dark Horse) / 2.3L High Output EcoBoost.
Install genuine OEM replacement hardware or execute registry / service commands. Ensure all mounting bolts are torqued to factory specifications. on the Ford Mustang equipped with 5.0L Gen 4 Coyote V8 (480HP–500HP Dark Horse) / 2.3L High Output EcoBoost.
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 Ford Mustang equipped with 5.0L Gen 4 Coyote V8 (480HP–500HP Dark Horse) / 2.3L High Output EcoBoost.
Other Common Fault Codes on Ford Mustang
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Ford Mustang:
4. Ford Mustang B1325 FAQs
What causes code B1325 to trigger on a Ford Mustang?
On the Ford Mustang (5.0L Gen 4 Coyote V8 (480HP–500HP Dark Horse) / 2.3L High Output EcoBoost), 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 Ford Mustang?
On the Ford Mustang, the 16-pin DLC diagnostic connector is located Driver lower dash near OBD trim slot. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my Ford Mustang 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.