U0101 on Ford
Lost Communication with TCM
U0101 on Ford vehicles indicates lost communication with tcm. Au7o has documented this code across 2 Ford models — most commonly on Fiesta, Focus. This is a network communication code meaning a control module on the vehicle's data bus has lost communication with the Transmission Control Module (TCM). Modern vehicles use a shared data network (commonly CAN bus) so modules can exchange information; when the TCM stops responding or its messages disappear, other modules set this code. Because the transmission relies on this communication to shift properly, the vehicle may go into 'limp' mode, hold one gear, or refuse to shift normally. It generally indicates a wiring, power, ground, or connector problem on the network — or a failed TCM itself — rather than an internal mechanical transmission fault.
Common Causes of U0101
- •Damaged, corroded, or loose TCM wiring or connectors
- •Open or short in the CAN bus data wiring
- •Blown fuse or lost power/ground to the TCM
- •Corrosion or water intrusion at the TCM connector
- •Faulty Transmission Control Module
- •Another faulty module dragging down the data bus
- •Poor ground connection in the network
U0101 on Ford by Model
Ford Fiesta(1 issue)
- DPS6 Transmission Control Module Can Cause Loss of Engagement or No-Start2011-2015
Ford Customer Satisfaction Program 14M02 covers certain 2011-2015 Fiesta vehicles with the DPS6 automatic transmission. Electrical circuit failures inside the transmission control module can cause intermittent loss of transmission engagement while driving, an intermittent no-start, or loss of power. The historical program supplied time- and mileage-limited extended coverage whose current applicability must be checked.
Ford Focus(1 issue)
- DPS6 Transmission Control Module Can Cause Loss of Engagement or No-Start2012-2016
Ford Customer Satisfaction Program 14M02 covers certain 2012-2016 Focus vehicles with the DPS6 automatic transmission. Electrical circuit failures inside the transmission control module can cause intermittent loss of transmission engagement while driving, an intermittent no-start, or loss of power. The historical program supplied time- and mileage-limited extended coverage whose current applicability must be checked.
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View U0101 across all makes →Frequently Asked Questions
What does U0101 mean on Ford?▼
U0101 stands for "Lost Communication with TCM." This is a network communication code meaning a control module on the vehicle's data bus has lost communication with the Transmission Control Module (TCM). Modern vehicles use a shared data network (commonly CAN bus) so modules can exchange information; when the TCM stops responding or its messages disappear, other modules set this code. Because the transmission relies on this communication to shift properly, the vehicle may go into 'limp' mode, hold one gear, or refuse to shift normally. It generally indicates a wiring, power, ground, or connector problem on the network — or a failed TCM itself — rather than an internal mechanical transmission fault. On Ford specifically, this code is documented across 2 models.
What causes U0101 on Ford vehicles?▼
Common causes on Ford: Damaged, corroded, or loose TCM wiring or connectors, Open or short in the CAN bus data wiring, Blown fuse or lost power/ground to the TCM, Corrosion or water intrusion at the TCM connector, Faulty Transmission Control Module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0101 on a Ford?▼
Repair costs vary widely depending on the root cause and specific Ford model.
Which Ford models have U0101 documented?▼
Au7o has documented U0101 on 2 Ford models: Fiesta, Focus.