2002 V70XC P0502

Tylertech92 · Post by **Tylertech92** » 14 Sep 2019, 21:29

Hello all, First post here and First Volvo also, i recently purchased this vehicle and it had some engine lights, ive taken care of them all but one.

The Engine light i am receiving is P0502-Vehicle Speed Sensor "A" Circuit Low. The ABS light is on and also the traction control light is on, I am currently wondering where to begin on trouble shooting unless there is a straight forward answer on what to fix. i am in need of repairing this soon as i drive it to work a good distance on thruway and need cruise control, also it is preventing it from passing inspection. any help would be appreciated Thank you in advance

Post by **RickHaleParker** » 14 Sep 2019, 22:06

You need a code reader that can read the Brake Control Module (BCM) and the Transmission Control Module (TCM). VIDA-DiCE is recommended. Generic code readers cannot read the BCM or the TCM.

Best guess based on what information you have it is: the BCM AKA ABS.

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ECM-530D (P0502) Speed signal. Signal too low

Condition
Internal functions in the engine control module (ECM) check important parameters.
The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the speed has not changed over a certain number of seconds.

Substitute value
None.

Possible source

Faulty speed signal from the brake control module (BCM)
Faulty speed signal from the transmission control module (TCM).

Fault symptoms
Malfunction indicator lamp (MIL) lit.

Tylertech92 · Post by **Tylertech92** » 14 Sep 2019, 22:16

ok that is what i figured, thank you for that info, Now could i go to a junk yard and get a BCM off of another car i have read there other models that are compatible, i know where 3-5 v70s are and they are all around the same year that i have. i read some wheres that xc90 and also the S60 BCM is the same

Post by **RickHaleParker** » 14 Sep 2019, 22:37

Tylertech92 wrote: ↑14 Sep 2019, 22:16 i read some wheres that xc90 and also the S60 BCM is the same

Same hardware different software. Even if you get one from a 2002 V70XC, it still needs to be married to the vehicle. Software reload at the dealer or a software transfer by a cloner.

Tylertech92 · Post by **Tylertech92** » 14 Sep 2019, 23:02

Software reload at the dealer or a software transfer by a clone

Do vida tools have the ability of updates?

Post by **precopster** » 15 Sep 2019, 06:24

The Dice tool which is purchased with the fleabay Vida software is a good programming tool but you need the cloners to access your car via internet.

Post by **abscate** » 15 Sep 2019, 11:22

Budget $200 or so to have a cloner restore your CEM.

DOublebug and Yagger are the users here who are highly recommended.

Tylertech92 · Post by **Tylertech92** » 15 Sep 2019, 15:24

abscate wrote: ↑15 Sep 2019, 11:22 Budget $200 or so to have a cloner restore your CEM.

DOublebug and Yagger are the users here who are highly recommended.

the only thing is, being a new volvo owner i have no i dea where to begin to look for some one that can clone anything for volvos. i was just looking at the xeMODex BCM that comes pre updated and ready for the car and that is 400 or so dollars

Post by **precopster** » 15 Sep 2019, 15:29

Look at Abscate's post above. Doublebug and Yagger are the MVS members who perform the clone service. Just search their names on MVS and PM them. Sergey (Yagger) is in California

You'll need the Dice tool in any case as Volvo ownership pretty much demands it unless you have a sibling who is a dealer.

The $400 is well spent with XeModex if you have that kind of loose change lying around.

Tylertech92 · Post by **Tylertech92** » 15 Sep 2019, 16:15

thanks for the info. Do you have any recommendations on where to get a Dice tool? i have seen them on eBay and amazon