Thread: A Curly One D4 Major Gearbox Fault

Yes i did and there was nothing showing up that my mechanic could put his finger on apart from low battery voltage
its happens so randomly and has been going on for several years.
How could a major gearbox fault be rectified with a restart.

Originally Posted by Fos90

Yes i did and there was nothing showing up that my mechanic could put his finger on apart from low battery voltage
its happens so randomly and has been going on for several years.
How could a major gearbox fault be rectified with a restart.

The fault is not rectified. The system has parameters it works within. If something such as a pressure goes outside specification it will flag an error. When you restart it clears the errors and until you next hit the low pressure, it won’t fault again. The physical fault is still there, but the outcome which is to shut itself down and protect itself will reset until next activated.

You’ll have to get a diagnostic tool onto it when it’s failed if it’s not storing the faults.

Can the mechanic's diagnostic tool read gearbox DTCs or is it only retrieving PCM DTCs? A gearbox fault that triggers a message should always have also stored a DTC in the TCM.