My 2004 Saturn Vue (2.2l 4 cylinder with manual transmission) is throwing a code P0502. The speedometer is working 80% of the time but the odometer is only 10%. Can I rule out the VSS since the speedometer works when the odometer doesn't? Is it looking like it is an issue with the BCM. Any suggestions on next steps? Thanks

wont find on an owners manual would need a service / repair manual https://www.wholesalegmpartsonline.com/showAssembly.aspx?ukey_assembly=388021&ukey_make=1031&ukey_model=14671&modelYear=2004&ukey_category=19561 https://www.automaticchoice.com/en/general-motors-4t45e-mn5-automatic-transmission-parts-catalogue https://www.automaticchoice.com/en/products/find-your-parts?manufacturer=29851&model=3154&type=transmission they are in behind the trans cover

https://www.youtube.com/watch?v=ls_DZjFgSZ4

https://www.2carpros.com/questions/2004-saturn-vue-vue-changed-timing-chain-now-will-turn-over-sounds-starter

Speedometer
The instrument panel cluster (IPC) displays the vehicle speed based on the information from the body control module (BCM). The engine control module (ECM) calculates the vehicle speed based on the controller area network (CAN) serial data message indicating the wheel reference speed from the electronic brake control module (EBCM). The ECM sends a CAN serial data message to the BCM indicating the vehicle speed. The BCM sends a class 2 message to the IPC indicating the vehicle speed.
The speedometer defaults to 0 km/h (0 mph) when any of the following occur:
• The EBCM detects a malfunction in the vehicle speed sensor circuit.
• The ECM detects a loss of CAN communications with the EBCM.
• The BCM detects a loss of CAN communications with the ECM.
• The IPC detects a loss of class 2 communications with the BCM.

Having the vehicle scanned for codes would probably point you in a correct diagnostic direction .

You have to check speed sensor,could be worn out.

How could you be lost

You explained it perfectly

The shop did all the correct diagnoses,
seldom see that at all,they did great job
of finding the issue

There isn't one

not really able to trouble shoot this .. uhh you may need a new instrument panel.. this is something that a dealer will have to look at as it is illegal to mess with yourself.. But if it were me.. i would hook up an aftermarket odometer.. something you can take out.. and your engine will never gain any miles :) :) odometer would be just so you know the actual mileage.. ever go to sell it.. LOW MILES :)

please email me at [email protected] if you have any more questions. and please accept solution so i can get credit for it :) thank you

how do I loosen tension for serpentine belt

Hi:
the dash has seven or eight small bulbs illuminating the entire area, and approx 3 of them are for the speedometer/odometer area.

It seems odd that those are the first to go, but most likely the problem.
It often requires removal of the instrument cluster to swap bulbs. not too bad, but sometimes tricky.

Your Vue could have several engine/trans configs; the GM 4-cylinder with 4 speed trans or VTi variable trans; all 2004-2007 V6 Vues' used a Honda drivetrain with very little issues. There were countless problems the the VTi transmission- my guess would be that's what you have and there were several recalls reguarding those issues; I would check with a dealer quickly...