Fault code · U0101
Fault code U0101: the car loses the gearbox computer
U0101 means another control unit can no longer reach the gearbox computer (TCM). The gearbox may go into limp mode, shift harshly or not shift at all. The code alone does not say which part has failed.
On a DSG or another automatic we do not replace the mechatronic because this code is stored. First we measure whether the computer has power and ground and whether the CAN message arrives.
Seven Tuning works in Rotterdam and Waddinxveen: the workshop is in Waddinxveen and serves Rotterdam and the surrounding area. Remote coding works anywhere in the Netherlands and abroad, when the job allows it.
Configure my carBook an appointmentWhatsApp
What the code does and does not say
U0101 is a communication fault, not a verdict on the clutches or the oil. A voltage dip, a loose connector, a damaged wire or a computer that does not start up gives the same message. An adaptation lost after a battery change is a different fault; that is on the DSG mechatronic adaptation page.
Where we see it
- DSG and other automatics of the Volkswagen group (DQ200, DQ250, DQ381, DQ500 and related gearboxes)
- Porsche PDK, where the same communication code can be stored
- Other automatics where the engine has lost the gearbox computer
Our approach
- Read every control unit with the original manufacturer tools, not with a generic plug
- Live data: is the gearbox computer seen, and at what moment does it drop out
- Measure power, ground and the connector of the gearbox computer
- Check CAN before anyone orders a mechatronic or a wiring loom
- Only then do we say whether it is wiring, software or the unit itself
What you can send us
The make and model, the moment the fault appears (cold, hot, after rain, after a battery change) and a photo of the message. With that we say whether the car has to come to the workshop or whether a first read-out can be on-site or remote.
DSG mechatronic adaptation (a different fault)
Frequently asked questions
Does the mechatronic have to be replaced at once?
No. U0101 only says the communication is gone. A new unit does not help if the connector, the power supply or the wire is the cause.
Is this the same fault as a lost DSG adaptation?
No. A lost adaptation produces other codes and other complaints, such as shudder on take-off. That approach is on the DSG mechatronic adaptation page.
Does U0101 apply to a Porsche too?
The same code can be stored in a PDK. We read it with PIWIS and measure the communication first, as with a DSG.
More about our services
Seven Tuning · Rotterdam & WaddinxveenPrivacyTermsAccessibility