U0140 on Ford
Lost Communication with BCM
U0140 on Ford vehicles indicates lost communication with bcm. Au7o has documented this code across 2 Ford models — most commonly on Mustang Mach-E, Transit. U0140 is a network communication code meaning a module has lost communication with the body control module (BCM) over the vehicle's data bus. The BCM oversees many body and convenience functions — lighting, door locks, windows, wipers, anti-theft, and gateway communications — so losing contact with it can cause a wide range of seemingly unrelated electrical problems and warning lights. This is typically a wiring, connector, power/ground, or bus fault, or a failure of the BCM itself. Because the BCM often acts as a communication hub, this code can appear alongside other 'lost communication' codes. Typical repair costs on Ford range from $300 to $1,200, depending on the specific model and root cause.
Common Causes of U0140
- •Loss of power or ground to the BCM
- •CAN/data bus wiring damage, short, or open circuit
- •Corroded, loose, or damaged BCM connectors
- •Blown fuse feeding the BCM
- •Failed body control module
- •Water intrusion or corrosion in the harness
- •Another module faulting the shared data bus
U0140 on Ford by Model
Ford Mustang Mach-E(1 issue)
- 12V Battery Drain Causing No-Start and Dead Vehicle2021-2025
The Mustang Mach-E 12V auxiliary battery drains prematurely, leaving the vehicle completely inoperable. Unlike ICE vehicles, the Mach-E cannot be jump-started in the traditional sense when the 12V dies — the vehicle cannot even unlock its doors or engage the HV system. The 12V battery charges from the main HV battery via a DC-DC converter, but software bugs can prevent proper charging when the vehicle is parked. OTA updates have addressed some scenarios, but the issue recurs for many owners.
Ford Transit(1 issue)
- Body Control Module (BCM) Failure Causing Intermittent Electrical Gremlins2015-2020
Ford Transit BCMs, particularly on 2015–2019 models, have been reported to fail or develop software faults causing a wide array of seemingly unrelated electrical issues including random door lock cycling, instrument cluster malfunctions, and accessory power loss. Water intrusion from sunroof drains or cowl leaks can accelerate BCM failure by corroding the module's internal connectors. Ford TSB 18-2175 acknowledged BCM programming faults contributing to some of these behaviors.
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View U0140 across all makes →Frequently Asked Questions
What does U0140 mean on Ford?▼
U0140 stands for "Lost Communication with BCM." U0140 is a network communication code meaning a module has lost communication with the body control module (BCM) over the vehicle's data bus. The BCM oversees many body and convenience functions — lighting, door locks, windows, wipers, anti-theft, and gateway communications — so losing contact with it can cause a wide range of seemingly unrelated electrical problems and warning lights. This is typically a wiring, connector, power/ground, or bus fault, or a failure of the BCM itself. Because the BCM often acts as a communication hub, this code can appear alongside other 'lost communication' codes. On Ford specifically, this code is documented across 2 models.
What causes U0140 on Ford vehicles?▼
Common causes on Ford: Loss of power or ground to the BCM, CAN/data bus wiring damage, short, or open circuit, Corroded, loose, or damaged BCM connectors, Blown fuse feeding the BCM, Failed body control module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0140 on a Ford?▼
Repair costs on Ford range from $300 to $1,200, depending on the specific model and root cause.
Which Ford models have U0140 documented?▼
Au7o has documented U0140 on 2 Ford models: Mustang Mach-E, Transit.