Speedometer, odometer and cruise control not working?

Tiny
DALE MCCUMONS
  • MEMBER
  • 2005 CADILLAC CTS
  • 3.6L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
There are no check engine lights on but getting service engine soon and service stability system soon on display screen. All other gauges working. I hope it might be the speed sensor it would be easy to fix. But not getting a check engine light warning. Can't afford to take it to a shop. Can you test a speed sensor? I would appreciate your help. Thanks
Tuesday, October 11th, 2022 AT 10:45 AM

6 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,732 POSTS
It does sounds like the transmission output sensor is not working here is the location of the sensor so you can check it out. You can test the sensor by tapping into the sensor wiring harness and setting your voltameter to millivolts, then spin both axles the same way and should observe voltage if the sensor is working. here the job is being done on an ABS wheel speeds sensor but the process is the same.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

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Tuesday, October 11th, 2022 AT 11:22 AM
Tiny
DALE MCCUMONS
  • MEMBER
  • 11 POSTS
Thanks for the info. Isn't there a speed sensor on the right rear of transmission? If so, could that be the problem? Really didn't want to pull pan. It said with 7 in vin is that the eighth digit. Also, what about the filter, do I need to replace? Haven't had any problems with trans. Thanks for your help. It is appreciated. I'll be waiting for response. Have a good day.
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Tuesday, October 11th, 2022 AT 2:52 PM
Tiny
DALE MCCUMONS
  • MEMBER
  • 11 POSTS
Hi Ken, this is Dale, thanks for the info. I sent a second set of questions I know you're busy but if you get a chance to take a look it would really help me out. Thank you very much I really appreciate it.
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Wednesday, October 12th, 2022 AT 2:18 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,732 POSTS
It does look like the sensor is inside the transmission pan. I would do a filter as well and make a transmission service out of it.

Here is a guide that can help:

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

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Thursday, October 13th, 2022 AT 1:58 PM
Tiny
DALE MCCUMONS
  • MEMBER
  • 11 POSTS
Hi Ken, thanks for the info but can you please tell me if the speed sensor at right rear of transmission will (fix) the speedometer, odometer, and cruise instead of pulling the pan on transmission? The check engine light is not on, the car runs okay, the transmission works okay. Had it hooked to code reader shows no codes. Please help as soon as possible. Thank you very much.
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Friday, October 14th, 2022 AT 8:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,732 POSTS
If the problem is not the sensor which without a code, it might not be or the PCM is bad. If it was a circuit error, you would have a code for that as well. Let's try a CAN scan to see if anything comes up, you can get a CAN scanner (Controller Area Network) from Amazon for about $36.00.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Amazon CAN scanner link for about $36.00.

https://amzn.to/3R9lJ60
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Saturday, October 15th, 2022 AT 12:02 PM

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