It wont accelerate

700 is a generic transmission code. It went to limp mode, that's why it drives like it does. Have the codes read with a newer /better code reader or a scanner. Find out what other codes are in there.

What make , model , year and engine ?

Hi D, I suggest you take the vehicle and have a digital diagnostic scan carried out on the vehicle. The problem seems related to one of the speed sensors and the scan will identify which. Regards John

Engine speed increasing w/o acceleration suggests a problem w/ torque converter slipping or drive clutches slipping. I assume this is an automatic. Make sure you have adequate fluid in the transmission. I would also check for any OBD2 transmission codes that might be presented.

Code P0420 for catalyst system efficiency below threshold will not affect engine performance. It only means the catalytic converter is not performing as designed.

good luck


Parts Of BMW

now is the car 2017 plated or 2011 plated
as there is a vast difference between new and second hand new to you
Next question is it automatic transmission or CV transmission
With automatic as you increase rpm the car will accelerate and you will feel ratio changes up to the point where road speed = engine rpm for that throttle setting
With a CV transmission ( constant velocity transmission ) there is a torque converter but that is where the automatic action ends
In the transmission there are 2 pulleys with a big belt that can vary the ratios by pulling the flanges together on one and expanding on the other
This gives an infinite number of ratios and is designed to keep the best ratio selection for the torque band of the engine
SO how does it affect your driving
If you floor the pedal on take off, the engine will red line and stay there until road speed builds up
OR you ease back on the pedal and the pulleys start to change the ratios to suit the power band
How to drive it
when you want to take of push the pedal down to around 2500 rpm the car will take of normally
as the road speed increases , ease off the pedal and it will keep altering ratios until the correct road speed is reached for the rpm on the dial
The only catch that you will have to get used to is when going to pass at speed , you tend to floor the pedal to get past quickly but it will not down change ratios until you ease of the pedal and then the car will speed up to the rpm that you are holding it at
IT is different in driving and you will have to learn to drive to rpm not road speed and then it will behave normally ( set the rpm by the pedal and the transmission will catch up and to make it catch up , ease of the pedal in stages , just like a conventional automatic

If the engine RPM's increase when the gas pedal is floored, you have a transmission problem or a problem with your shift cables.

If the engine RPM's don't change when the gas pedal is floored, you have a throttle pedal cable problem or throttle body problem.

You will need an experienced mechanic to diagnose this problem as it is very dangerous to operate the vehicle under these conditions.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

If the RPM goes up you know you have a transmission that is slipping & needs to come out & be rebuilt. That is a no brainer as they say

evap codes won`t cause the acceleration problem.the miss fire codes could cause this if the miss fire is bad enough repair the miss fire problem first.i assume that you have checked the trany fluid for level and condition.if this happens all the time from a stop then you could have a transmission problem with 1st gear activating from a stop.if the rpm`s rise and your not moving with the rpm increase then its a transmission problem.the evap codes will have to be cleared then the car driven to see what shows up again as some false codes can set other codes.

on the accelerator cable in the engine compartment at the intake should be a little screw that will give you a little play for the idle

is it fly by wire or does it have a throttle cable ,if fly by wire change the sensors on the pedal