View Full Version : Speedometer stopped working - CTS-V Speed sensor location
01-30-11, 04:36 PM
Hi, new to the board here. I just ordered a car to be made that will use the engine/6-speed out of a 2004-5? V-series. I'm in the process of collecting up lights, wheels, guages etc. to install when I receive the car. I purchased a guage set and LATER realized that I don't know how I'm going to get the speed signal. I have a 04' Z06 Vett with the sensor in the differential housing next to the transaxle. I assume that the V-series may have the same system in their differential also, but I have elected to use a S-10 live axle to save $3-3500 in designing a IRS for this little thing. I imagine the sensor would be of the VR type like the Vett.
Can anyone confirm where the sensor is? If it is in the trans, great, becuse I'll be using it. Thanks. Ken Hamilton............Oregon
01-30-11, 05:13 PM
I don't know how many speed sensors the V has, but there is one on the trans, near the back where the driveshaft connects. I took a pic but I'll have to find it. I only know this because mine has gone bad twice due to trans fluid leaking from it..
01-30-11, 06:10 PM
01-31-11, 02:10 PM
Darkman thnk you so much. That PDF. you attached on the VSS looks to be the one. Thanks again.........Ken
I can't see the PDF I am having a problem with my speedometer checked the fuse and replaced the Sensor on the transmission, it just quit and been trying to figure it out with out with out taking it to the dealer.
02-21-15, 05:18 PM
That circuit is reasonably simple, but trouble shooting is much easier with a GM Tech II scanner typically used by the dealer and other shops. The speed sensor in the transmission sends signals to the ECM, and the ECM sends signals to the instrument cluster that the cluster uses to calculate and indicate the speed. With a Tech II scanner you can tell whether is issue lies with circuit between the sensor and the ECM, the circuit between the ECM and the instrument cluster, or with one of the three components (sensor, ECM, Instrument cluster). The sensor in the transmission is about the only part you can throw at the problem. You can, of course check the wires and connectors.
Thanks I was thinking I need a dealer to look at the ECM I need the flash for my oil temp also so I guess it's a trip to the dealer. I have been doing all my work because I can and don't want to pay someone for things I can do I had checked all connections but hit a roadblock.
It's a labor of love.
Thanks Darkman for the info.
02-21-15, 10:03 PM
Have you applied the grounding fix from the long thread on oil temps?
Yes fixed all the grounds and to no avail getting frustrated going to try the flash on the instrument cluster next.
Well after two hours at the dealer still no speedo he scanned the car no codes and get got signal to the gauges, made them move but nothing. He is calling the tech support line and is going to call me back.
Any help out there
So update my friend hooked up to EFI LIVE and looks like I have a loss of signal from the pcm to the dash cluster! Now today's project is to pull the dash and check continuity of the circuit from the PCM . I need the reference on how to pull the dash cluster so I can get to the harness any help Darkman?
02-27-15, 01:55 PM
Well thanks Darkman I suspected that I wasn't getting signal from the ecm to the dash but pulled the dash and ecm and checked continuity and that wasn't it, so now looking for more answers. It's going to have to wait as I have to leave town for work for two weeks.
More web searching and phone calls I guess.
10-13-15, 04:19 PM
My speedometer stopped working,came home frombeeing away after 3 mo.and not working at all,does anyone know if it could be a fuse(and where it might be)or the speed sensor,and where it's located.need help.
Thanks to whom ever can help.....jrcas1953
10-16-15, 03:51 PM
Having any luck with that my speedometer stoped and not sure if i can get to that sensor,was it dificult to get to?
10-16-15, 06:10 PM
Having any luck with that my speedometer stoped and not sure if i can get to that sensor,was it dificult to get to? The speed sensor on the manual transmissions in the CTS-V and in the CTS are on the outside of the transmission and relatively easy to access. The speed sensor on the automatic CTS requires the removal of the fluid pan.
The part in the red box is the part that actually sends the rotational speed to the sensor that is bolted to the trans. Nothing can really go wrong with it so don't 337778let someone talk you into pulling the trans to replace it!
Check out that thread.
Part number E7 in this pic. About $20 before shipping, tax, etc. from transmission shops. You can find it at AZ, Advance, etc. also.338042
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