ABS light comes on

Usually caused by the front wheel bearing hub assembly which has the ABS /SPEED sensor built in needing replaced .

got error codes today but dont know what they mean

c0800 low voltage
co241 engine torque
u2105 engine control
u2100 can bus malfunction

how do i solve these ???

Could check ALL engine earths , but if not that may be a faulty ECU

so would you recomend that i change the hub first ???
or just pay out £500 for new ECU ??

You may have two seperate faults .Check the wiring to the bearing / ABS on the hub first .The bearing ass, will be a lot cheaper to replace and may cure the speedo /ABS fault .Then if still having the other fault codes , there are many companies who will test the ECU and recon a lot cheaper if needed .

Try removing ,cleaning connector to abs unit.

lots of things going on with this car now lol ..changed hub and done new accelerator pedal, and still abs is on and speedo going mad , also car keeps going into limp mode with a car with a spanner light coming on, back lights keep going out and when i turn car on the reverse lights come on, hand break light keeps coming on ....HELP ME PLEASE