V70XC: Electrical fault non start

[JOE GANT]

Hi all im trying to fix my xc70 2013 d5. It was driving as normal then stopped the car for 20 mins came back to immobiliser fault, braking fault cant recognise depressing brake pedal to start or gear box park position the car will simply not turn over.
We plugged the car in and have faults in the
cem
b10a202, b10a206, b10a215, b10ea13, b11d487, u010000, u010100, u012100, u013100, u015100, u023500, u043300
dim
u01000, u010100, u012100, u015100, u042268
demu010000, u012100, u040168
pamu010100, u012100, u040286, u041586
pbm
p061e67
u01000, u010100, u012100, u015100, u040168

a bit of a list but i see that some are duplicated especially the canbus ones,
we cant seem to communicate with the srs module, the car has done a good few miles and was wondering if there are any wiring corrosion hot spots to aim for or could a module be up the swanny? Any thoughts or help would be greatly appreciated.

[37 RUBY]

Hello

Well corrosion at the CEM and connector is well documented for P3 XC70's of that era due to poorly applied windscreen sealant allowing water in....so you could at least check the plug connector on the CEM for corrosion and water ingress by checking under carpets to see if they are soggy underneath.....you have nothing to lose from cleaning and re-seating the connector and see what gives.

You have already noted that there is a brake pedal position sensor issue and it could quite possibly be as simple as a faulty pedal switch.

HTH

[JOE GANT]

Hi ruby thankyou for your help. Unfortunatly everthing seems dry no signs of water ingress.
Ive had the carpets up , checked all the plugs for corrosion checked the maze of wiring the best i could. Also noticed i cannot lock or unlock the car i am starting to have doubts about the cem. It might have blown within the unit its self.
I fitted two new brake sensors to no avail. I cant understand why it wont recognise the vehilce is not in park or the brake pedalis depressed. There must be a comms fault.

[v70 camper]

Originally Posted by JOE GANT

Hi ruby thankyou for your help. Unfortunatly everthing seems dry no signs of water ingress.
Ive had the carpets up , checked all the plugs for corrosion checked the maze of wiring the best i could. Also noticed i cannot lock or unlock the car i am starting to have doubts about the cem. It might have blown within the unit its self.
I fitted two new brake sensors to no avail. I cant understand why it wont recognise the vehilce is not in park or the brake pedalis depressed. There must be a comms fault.

Any idea what your solution was?
I have similar codes

[Simmy]

check battery voltage it needs to be at least 12.5 if you find any thing less you will struggle .Volvos don't like low voltages a scan with vida would be an advantage as the posted codes don't tell us where the fault lies any diagnostic tool that is connected will draw more current to interrogate the modules making any weak signal worse check earth points and cem plugs .. how old is the battery?

[v70 camper]

Thanks for response!

Baterry is new/when on computer on charger
No start…

immobilizer, oncall, power steering, airbag, brake problem, airbag, parking sensors error on display

Codes: U101000 U010100 U012100 U15100 U040168 U032700
U016700 B10A202 B10A205 B10A215 B11487

ABS, TCM and SRS module are not readable

Checked ABS, ECM, ECU plugs for moisture, nothing found...

[Simmy]

have you checked the cem multi pin plugs? cem is not the ecu... a scan with vida will help you track down your problem.

[v70 camper]

Originally Posted by Simmy

have you checked the cem multi pin plugs? cem is not the ecu... a scan with vida will help you track down your problem.

Yes, certainly dismantled and opened, equal to new unfortunately