Code P1633?

The images look normal. Thanks for uploading, P1633 code is a fault in the vehicle speed signal from the VSS, I would see if the sensor is plugged in. Also, does the speedometer work? Here is the sensor location so you can check it out and see what's going on #7. Check out the diagrams (below). Please let us know what happens.

No, the Speedometer is frozen and thank you I had a hard time finding this location. nobody would tell me where it's located, Ken, I'm going to open it tomorrow and tell you how it goes.

Sounds good, I think we may have found out the problem.

Hey Ken, do you know where I can order the VSS output sensor for my 1999 Volvo S80 2.9L? And the part number? It is very hard finding it.

Hi Kavin,

That part maybe hard to find, call around and try Ebay. here is the part number:

Speed Sensor - 9445688

Let me know what happens.

Thank you Ken.

I didn't see the part on eBay at all but by chance do you know where the ABS relay is located on my 1999 Volvo s80 2.9L?

the control relay is inside the ABS module. here are the instructions and location:

Oh no, not the ABS control module the relay for it or the VSS relay if it has one.

The locations because Volvo only tells you the fuses but not the relays as well.

Hmm, I don't see the relay. Here are wiring diagrams for the transmissions and they don't show a relay for the VSS (output speed sensor). Check out the diagrams (below).

Hey Ken, it's me again. Do you think faulty rear wheel speed sensors can be the problem?

I don't think so because the car has a VSS sensor. Did you check the wiring between the sensor and TCM?

I replaced the VSS, I found the part online finally but the code persists.

I would check the connection between the sensor and the TCM and if okay replace the TCM. You can get a rebuilt unit by searching Google or eBay. Here is the location of the TCM and how to replace it in the images below. Check out the images (below). Please let us know if you need anything else to get the problem fixed.