U0101 on Ford Vehicles: Lost Communication With TCM
The engine computer and other modules stopped hearing from the transmission control module. U0101 →
7Complaints mentioning the code
#2Rank among 11 brands
0.3%Share of Ford DTC complaints
In NHTSA owner complaints we analyzed for Ford, U0101 was mentioned 7 times.
Notes by brand
Focus and Fiesta with the PowerShift dual-clutch automatic are well known for transmission control module failures that cause shudder, no-engage and communication codes; the TCM sits outside the transmission and is replaceable on its own.
Most mentioned models
| Ford Focus Bev | 4 | |
|---|---|---|
| Ford Focus | 2 | |
| Ford Explorer | 1 |
Model years mentioned
Components named in these complaints
- Power Train (6)
- Electrical System (3)
- Engine (2)
- Suspension (1)
- Electronic Stability Control (esc) (1)
Often appears together with
U0100
Network
Another module stopped hearing from the engine computer on the CAN network.
High
P0606
Powertrain
The engine computer failed its own internal self-test – check its power and grounds before…
Moderate
U0401
Network
The engine computer is still on the network, but another module doesn't trust the numbers it's…
Moderate
Possible causes
- Blown TCM fuse, failed relay or poor TCM ground
- Corroded, fluid-soaked or loose connector at the TCM or at the transmission case pass-through
- Internal TCM failure, especially heat-cycled units mounted inside or on the transmission
- Low battery voltage or a jump start knocking the TCM offline
Related codes
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.