B1325

B1325 is Ford's BCM-specific battery voltage out-of-range code — the BCM's monitored voltage rail has crossed either its lower (typically <9.0V) or upper (typically >16.0V) limit and stayed there long enough to latch. Cheapest-first ladder: (1) Multimeter on the battery posts at rest (should read 12.4-12.8V) and with the engine running (13.5-14.5V); if either reads outside spec, the battery or alternator is the cause, not the BCM. (2) Load-test the battery — a battery with 12.6V open-circuit but only 9V under a 200A load test will set B1325 every cold start and is otherwise invisible to a static voltmeter. (3) Inspect the BCM's main connector for green-corrosion on the voltage-sense pin (typically pin 1 or 2 of the main power harness on Ford BCMs of this vintage) — corrosion adds series resistance that the BCM reads as low voltage even with a healthy battery. (4) Scan with FORScan and compare the BCM's reported voltage PID against your meter reading — a 1.5V+ discrepancy means the BCM's internal sense circuit is the failure. Expensive-misdiagnosis caveat: B-codes for module programming/configuration almost never mean a bad module — they mean a missing or corrupted As-Built / FORScan / GM Tech-2 config file; before condemning a $400-$1000 module, attempt re-configuration with dealer scan tool first, and on Ford specifically, dump the original module's As-Built data via FORScan before unplugging the suspect BCM so you have the config available if you do end up swapping.

Vehicle-specific patterns: 2010-2014 Ford F-150/Expedition/Edge/Flex with the SmartJunctionBox-style BCM throws B1325 during Sync2 reflash events because the reflash holds the BCM awake while the alternator regulator hunts, creating a wakeup-loop that the BCM logs as a voltage excursion. 2008-2012 Lincoln Navigator/MKX commonly throws B1325 from a known weak ground at the body-to-frame strap behind the driver-side fender — clean and re-torque the strap and the code clears without parts. 2007-2010 Ford Escape/Mariner/Mazda Tribute throws B1325 from a documented BCM internal solder-joint failure on the voltage-monitor circuit — Ford released remanufactured BCMs that addressed it. Any Ford after a jumpstart, a battery disconnect, or a parasitic-draw event can latch B1325 transiently — clear and re-test before throwing parts. Estimated repair: $0 (clean grounds, post-jumpstart clear) to $850 (BCM replacement plus As-Built reprogram at a Ford dealer or independent with FORScan/IDS access).