Opel Astra-J, Zafira-C - Engine has speed variations

Opel Astra-J, Zafira-C

Model year 2012-2013

Engine code: A14NET

Vehicles with automatic gearbox

Vibrations when pressing the brake pedal

Engine has speed variations

If this defect is determined on the vehicles specified above, this could be in conjunction with a software weakness of the gearbox control unit.
Test requirements:

The vehicle is stationary
Engine idles
Gearbox oil temperature higher than 80°C
Brake pedal is pressed and held
Engage shift stage "D"

If the defect is determined in this situation, shift to gear stage "M" for further tests.
If the vibrations and speed variations are no longer present after 5 seconds, the defect can be rectified by reprogramming the gearbox control unit.
The updating of the software is carried out in an authorized garage in this case.

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