What usually causes it
- A damaged wire or a loose, rusty plug on the network line
- A weak battery or a bad ground
- A blown fuse for the transmission computer
- A failed transmission computer
U0101Starts at: Get it checked this week
Lost contact with the transmission computer
Other computers in the car cannot talk to the transmission computer. The transmission computer controls the gear shifts, so shifting may change.
Check this first
Check that the battery cables are tight and clean, and look at the fuses for the transmission computer. A weak battery can cause many network codes at once.
What to watch for
- Harsh shifts, or stuck in one gear
- The car goes into a low power mode
- Many warning lights on at once
Can I keep driving?
We rate U0101 as Get it checked this week. It is not an emergency yet, but it can get worse. If the light starts flashing, stop driving soon.
Quick answers about U0101
What does U0101 mean?
Lost contact with the transmission computer. Other computers in the car cannot talk to the transmission computer. The transmission computer controls the gear shifts, so shifting may change.
Can I keep driving with U0101?
We rate U0101 as Get it checked this week. It is not an emergency yet, but it can get worse. If the light starts flashing, stop driving soon.
What usually causes U0101?
The most common causes, in order: A damaged wire or a loose, rusty plug on the network line; A weak battery or a bad ground; A blown fuse for the transmission computer; A failed transmission computer.
Estimates only. A mechanic should confirm. The same code can mean slightly different things on different cars; the app explains it for your exact year, make, model and mileage.