A6 2.4 CVT Jerks between 20 and 40mph on Light Throttle

[m1ckl]

As title really.

My car is jerking if I accelerate slowly. It occurs both from standing and rolling starts and seems to happen at just above 20mph and just below 40mph.

It feels like a conventional auto that isn't changing smoothly.

The problem doesnt occur if more throttle is applied and seems to work perfectly in all other situations.

According to the service history I got with the car the oil was done at 80,000 and the car is now on 113,000 so is due a change soon.

Is an oil change likely to solve this or could it be clutch related or something even more serious.

I've read threads regarding CVT failures (and wish I had done so before buying the car) but I dont get any flashing lights or limp mode.

[a8 tech]

most likely input shaft failure, as the gear selection has no auto mode for pre determined gear change try the tip gate function which does have pre mapped gear change points, but your complaint is known as bucking.You could re adapt the gearbox as this may resolve the problem.

[m1ckl]

Thanks for the reply.

How do I go about re adapting the box?

Is it as simple as fixing BMW gremlins? i.e. remove the battery for 20 minutes.

[a8 tech]

enter address 02 gearbox electrics (you need vag com)

Special Procedures

Defined Test Drive
Prerequisites:
Ignition ON and Engine ON.
No Fault Codes stored.
Transmission Oil Temperature must be between 60 °C and 90 °C.
If the procedure does not succeed in the first try, make sure the temperature is above 80 °C.
All driving and braking has to be done in partial load, avoid full throttle/braking!
Normally the adaptation needs to be carried out when:
Transmission Control Module has been recoded
Input Shaft has been replaced
Hydraulic Unit has been replaced
Transmission Control Module has been replaced
Transmission has been replaced

[Select]
[02 - Transmission]
[Adaptation - 10]
Channel 000
[Read]
[Save]
[Done, Go Back]
[Measuring Blocks - 08]
Block 010 (in 1st Row)
Block 011 (in 2nd Row)
[Go!]
Check fields 2, specification is ADP OK.
Move the selector lever in position D and drive with partial load 20 m / 70 ft forward, then brake to standstill.
Hold the brake for 10 seconds.
Move the selector lever in position R and drive with partial load 20 m / 70 ft reverse, then brake to standstill.
Hold the brake for 10 seconds.
The procedure needs to be repeated at least 5 times and can be repeated up to 10 times until the measuring values show ADP OK.
[Done, Go Back]
[Close Controller, Go Back - 06

[m1ckl]

Sounds like a lot of hassle but I'll give it a go as I've got VAG COM from when I had my Passat.

If that doesnt work would I have grounds to give the car back as I've only had it 4 days?