Automatic gearbox problem

[rosalan]

Occasionaly when I change from Neutral to A1, the gear remains in Neutral but only when I am completely blocking traffic. I am not too sure why people indicate that I look like a Unicorn but several people indicate that I do. Would a gearbox oil change be of help? Or is this the precursor of something more serious? My van is a Renault Master, with an Adria Matrix body. Any ideas appreciated.

 

[Clivefog]

Gear box fluid change would be my first step. Have the OBD read to see if there are any codes. May be a lever/linkage problem?

 

[Phill D]

Sounds linkage or a sensor to me,
I don't know the Renault system but can I ask as its an auto does need to be put in neutral when in traffic.

I appreciate that something needs fixing anyway.

 

[Detnor]

Alan, we had similar on a Mercedes auto box, it was the transmission fluid.

 

[pappajohn]

Is it a torque converter auto or an automated manual.
If it's an automated manual I doubt its gearbox fluid.

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[chatteris]

Think the renault box is a robotised manual

 

[pappajohn]

Think the renault box is a robotised manual

Gearbox oil should be good for maybe 100,000 miles.
More likely a lazy servo.

 

[rosalan]

Not being familiar with Robotised automatic gearbox, I think it a true automatic with the option of selecting each gear or fully automatic. I tend to put it into neutral when stopped in traffic believing this is kinder to the unit, or I would be holding it back from creeping forward. I will have the idea of a 'lazy' servo checked out. Thanks folk for your advice.

 

[dabhand]

I had a similar problem on a Mercedes sprintshift, three vans ago, which is ‘robotised’ ie a manual gearbox with a hydraulic pump which changed the gears, to all intents and purpose, an automatic. It was the hydraulic pump on mine