Need help with my 2004 V70 2.4L T5. Last week it started to show Brake Failure Stop Safely and ABS Skid Service messages on the dash, I did the DTCS and got the following DTC Set notices
BCM
CEM
DDM
REM
UEM

The TCM just kept saying checking even though I drove the car with it on for 15 minutes.

I use a bluetooth ODBII reader with Tourqe and it reported No Fault Codes so I took it to AutoZone and had them check it and they also found no Fault codes stored.

Twice now the Transmission acts up and won't shift when I first start to drive the car cold. Goes away if the car is warmed up first.

The ABS module was rebuilt 2 years ago, the battery is less than a year old and has 12.43 volts in the engine compartment.

I thought that perhaps it was a bad brake pressure sensor but can not fine one on any of the brake lines or Master Cylinder. Thinking maybe the ABS models use the ABS modules to read pressure instead of an inline sensor?

I disconnected the battery and removed the CEM to inspect it for any heat or water damage and found none, cleaned all the contacts and re-installed. Still the same dash warnings.

Any thought or ideas would be appreciated.

 

Dealer diagnosis is free, up to an hour. They will be able to pull the codes that generic scanners and code readers cannot.

 

Thanks, I did not know that. I'll see what the dealer says

 

So I made an appointment and went to the dealer, they told me that the only code was a BMC 0030, Left rear wheel sensor and quoted $714 because the part would be $120 and the labor was so high because they have to remove the gas tank.

I declined service, bought both rear wheel sensors online for about $25.

I tested both of the old sensors with an ohm meter, the left read 14.7 ohms and the right rear read as an open circuit. The new sensors both tested at 14.7 ohms

Instead of removing the gas tank I just used a heavy nylon line to pull the new wire for the left side up through the access cover under the seat. Test drove the car and same messages. So I replaced the right side and still the same messages.

I disconnected the battery for 30 mins and still the same messages when you turn the key on even before starting the car so I figure the messages are stored in non volatile memory.

Does the dealer need to clear the messages are is there some way I can do it?

 

I bought a Aphix Volvo code reader and it allowed me to read and reset the codes,
Still getting:
BMC 0030, LR WHEEL SENSOR
BMC 0040, RR WHEEL SENSOR
BMC 0057 ABS POWER VOLTAGE LOW

Does anyone have experience with load testing the wiring from the abs module to the sensors?



Thanks

 

not likely the wires - you may want to check/clean ground connections, and clean the ABS controller connections with electronics cleaner to see if that helps. Also you may want to see if there's a replaceable relay in the service path (not sure if it would go through the CEM, but that may be a consideration).