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Code P1633?

Tiny
KAVIN THOMPSON
  • MEMBER
  • 1999 VOLVO S80
  • 2.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 128,855 MILES
I have had this same problem for 3 years now, I'm trying to get the car to pass the Smog test but this one code won't allow me to. I've replaced the voltage regulator, replaced ally ABS wheel speed sensors and replaced the ABS control module twice but it won't go away, but something I've noticed is this loose connection hanging out, does this have something to do with it?
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Tuesday, July 26th, 2022 AT 9:01 PM

15 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,262 POSTS
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.
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Wednesday, July 27th, 2022 AT 10:45 AM
Tiny
KAVIN THOMPSON
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  • 19 POSTS
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.
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Wednesday, July 27th, 2022 AT 6:39 PM
Tiny
KEN L
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Sounds good, I think we may have found out the problem.
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Thursday, July 28th, 2022 AT 10:12 AM
Tiny
KAVIN THOMPSON
  • MEMBER
  • 19 POSTS
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.
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Friday, July 29th, 2022 AT 6:01 PM
Tiny
KEN L
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  • 43,262 POSTS
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.
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Saturday, July 30th, 2022 AT 12:56 PM
Tiny
KAVIN THOMPSON
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  • 19 POSTS
Thank you Ken.
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Saturday, July 30th, 2022 AT 1:24 PM
Tiny
KAVIN THOMPSON
  • MEMBER
  • 19 POSTS
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?
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Monday, August 1st, 2022 AT 8:26 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,262 POSTS
The control relay is inside the ABS module. Here are the instructions and location:
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Wednesday, August 3rd, 2022 AT 10:45 AM
Tiny
KAVIN THOMPSON
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  • 19 POSTS
Oh no, not the ABS control module the relay for it or the VSS relay if it has one.
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Wednesday, August 3rd, 2022 AT 11:42 AM
Tiny
KAVIN THOMPSON
  • MEMBER
  • 19 POSTS
The locations because Volvo only tells you the fuses but not the relays as well.
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Wednesday, August 3rd, 2022 AT 11:43 AM
Tiny
KEN L
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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).
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Thursday, August 4th, 2022 AT 6:17 PM
Tiny
KAVIN THOMPSON
  • MEMBER
  • 19 POSTS
Hey Ken, it's me again. Do you think faulty rear wheel speed sensors can be the problem?
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Wednesday, September 28th, 2022 AT 10:06 PM
Tiny
KEN L
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I don't think so because the car has a VSS sensor. Did you check the wiring between the sensor and TCM?
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Thursday, September 29th, 2022 AT 1:27 PM
Tiny
KAVIN THOMPSON
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  • 19 POSTS
I replaced the VSS, I found the part online finally but the code persists.
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Friday, September 30th, 2022 AT 7:11 AM
Tiny
KEN L
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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.
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Friday, September 30th, 2022 AT 12:26 PM

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