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Alot. 2005 xc90 2.5t. Months ago it just started stalling in…

Customer Question
2005 xc90 2.5t Mechanic's...

2005 xc90 2.5t

Mechanic's Assistant: Are you fixing your XC90 yourself? What have you tried so far?

Months ago it just started stalling in middle of driving, then electronics started acting funny. It lost comm to brake control module so i replaced it it wont even start i think it lost the key or something. I used vida and it said it cant communicate with ecu brake control module, and some other conputer

Mechanic's Assistant: Do you have a backup key? Maybe the emergency kind that fits in your wallet?

Yes i have 2 keys

Submitted: 2 months ago.Category: Volvo
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Answered in 1 day by:
4/2/2018
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago
Enes
Enes, VOLVO Master Technician
Category: Volvo
Satisfied Customers: 5,666
Experience: 18+YEARS WITH VOLVO AS THE MASTER VOLVO MECHANIC&Ase
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you cant install used brake module you must buy new and then when you buy new you must take to Volvo dealer to program with software to match car vin before it will work

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Customer reply replied 2 months ago
I know that but it is not brake module. It dtarted way before brake module problem thats just most recent
Customer reply replied 2 months ago
The BCM what can cause the car to lose the key so I I know that it has to be the ECU or the cem module I'm just having a hard time trying to figure out which one because I know the cm's and notorious for going bad on this because of the water damage in mind did have water on it when I was taking it out and but it's communicating with the East with the c e m but it won't communicate with the ECU
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

that is very long process all wires communication must take a part tested than you narrow it down no easy way

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

cem is very common to fail so I would start right there

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Customer reply replied 2 months ago
Do u have any experience as far as the things that go wrong with ecu that doesnt happen with ecu? And vice versa
Customer reply replied 2 months ago
I mean happenns with cem that dont happen with ecu
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

witch ecu

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

you kind install software called total reload see what comes back online , than you test can communication can high can low voltages test resistance in system wires and modules CONNECT BRAKE OUT BOX AND THAT ALL HELPS TO FIND WHAT TO DO

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

YOU NOT GONE BE ABLE TO FIX ALL THIS AT HOME WITHOUT FULL WIRING DIAGRAMS AND GOOD KNOLEDGE ABOUT CAN COMUNICATION WITH EACH MODULE WE TALK HERE FOR DAYS WOULD NOT HELP YOU MUCH

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Customer reply replied 2 months ago
I have full wiring diagrams vida, everything i need
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

I CANT TEACH YOU HERE ALL CAN COMUNICATION IN CAR IS NOT THAT SIMPLE A Controller Area Network (CAN bus) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other in applications without a host computer CAN is a Controller Area Network, which is a network of independent controllers communicating securely. ... When the CAN bus is in idle mode, both of these lines carry 2.5V but when data bits are being transmitted, the CAN high line goes to 3.75V and the CAN low drops to 1.25V

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Customer reply replied 2 months ago
Can you tell me what other part # is interchangeable with my cem if any mine is 30728539 because every time i read online it seems that part #always goes back to the diesel model
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

YOU MUST BUY NEW CLEAN CEM

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

NEW PART NUMBERS ARE NOW CHNAGED VOLVO WILL GIVE YOU NEED BLANK CEM FOR THAT VIN

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago
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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

THAT PART NUMBER IS ***** MADE ANYMORE IS OLD THEY CHANGE EVERY FEW MONTHS

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Customer reply replied 2 months ago
My local dealer said volvo recomends new clean cem but i can buy used one clean it install it and they can download software
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

NO THEY CANT

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

CANT USE A USED CEM

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Customer reply replied 2 months ago
They said they can they just cant install used part
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

THEY WILL TRY BUT WILL NOT WORK YOU CAN TRY IF YOU LIKE

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

REASON THEY USE MODULE AND PROGRAMING SO YOU CANT USE A USED PART TO BUY NEW PART THEY DO THAT BEAUCE OF THAT

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

HERE IN CHICAGO WE TELL COSTUMER USED CEM WILL NOT WORK YOU CAN INSTALLING BUT ALL KEYS CHIPS AND PROGRAMS AND VIN INFO ON USED IS FROM OTHER CAR SOFTWARE WILL FAIL SAY MISTMACH VIN TRY AAGAIN

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Customer reply replied 2 months ago
Dont volvo offer that also? I was reading online that they released somethibg allowing you to use a used cem? As long as u have original one also
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

PEOPLE WRITE ONLINE A LOT YOU CAN TRY BUT IM SURE IT WILL NOT WORK

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Customer reply replied 2 months ago
It was actually a link on a blog that was from volvo
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

YOU CAN TRY BUT AGAIN IF YOU BUY USED THEY MUST INSTALL AND REMOVE WHEN YOU DO PROGRAMING TO DO RIGHT AWAY

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

BY THAT TIME YOU PAY LABORAND TRY IS BIG RISK YOU CAN BUY ALMOST NEW

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

DO YOU HAVE MORE QUESTIONS FOR ME

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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago

.

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Customer reply replied 2 months ago
What does a new one go for
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago
750$
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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago
If you can rate neutral please I did not offer much help you can reply to me still
After you press accept I can reply faster
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Customer reply replied 2 months ago
Let me take you back to the begining.
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago
Ok
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Customer reply replied 2 months ago
2-3 years ago i was driving and car started putting real bad. Did a check low fuel pressure. I changed the fuel pump and it was ok. Car sat for about 2 years. The passenger side floor was soaked with puddles, from the sunroof drain. When i started driving it again that problem started again. Then got worse the car would just shut off while driving. The abs light came on. As i was still driving it. Eventually it sometimes wouldnt start. Then when it did start no electronics would work or come on for about 30 seconds. The car was extremely hard to put in gear. Had to really pull it hard. While trying to figure this out brake failure safely pull over came up. I then noticed driver floor getting wet. Hooked up vida like 100 codes came up. Deleted them. Checked again. Then it said cant connect to icm, ecm, and bcm. Followed by getting power but wont start not turning over nothing.
Took out cem it was wet on top.
Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago
Mostly bad cem
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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago
I would start there
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Volvo Mechanic: Enes, VOLVO Master Technician replied 2 months ago
Please press accept and do ratting we can follow up again anytime thanks
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