I have a 1998 Jaguar XK8. My ABS light is on and stability control failed light is on to. Code P1643 came up on OBD. What could be the problem?

 

could be dirty sensors,weak battery,or bad ABS module-in that order.
lots of discussions on here in regards to the ABS light. Seems to be one of those Gremlins no one can figure out.

Hope this helps....

 

I would suggest that you first have your battery checked and I am not suggesting just a voltage check. If you take it to AutoZone, PepBoys, Sears or an establishment like them that has the equipment to check the batteries integrity. We are finding that old or weak batteries can and will set faults that do not exist. Did you attempt to clear the P1634 code? If so did it come back?

 

You should start by cleaning the four ABS sensors with dishwashing liquid or brake cleaner--1/2 hr. job.

Then, reset the codes and see if the lights go out.

Second thing to do is check the resistance in the big wiring connector that plugs into the ABS Module--to see if the wires coming in from the ABS Sensors are okay. (Sometimes they get yanked around and fail.)

It can also be an ABS/TCM module problem. Some have a short on the circuit board that can be soldered. (Mine was fried.)

P1643 shows as a problem with CAN Link Engine Control Module/Transmission Control Module Circuit/Network.

This is one of those codes that could result from many things. CAN is essentially "computer wiring" that goes between modules that allows communications. Sometimes connectors are corroded. There can be polarity problems in wiring, and shorts. Sometimes it's a mechanical problem that throws the codes.

Just take it step by step. Gus has a worksheet and info on ABS codes.

Good luck.

 

+1 on Gus's advise and website. Use his checklist and a good multimeter to start eliminating potential problems. I just went through this goat rope. All indications told me it was my ABS module, even sent to BBA remanufacturing twice! They told me everything was OK. Just for grins I got a used module off e-Bay and checked the internals for cracked solders. Installed box and everything cleared up. Knock on wood, haven't had codes in two weeks.

Good luck and trust what you troubleshoot, not what a rebuilding company tells you.