I have a 1998 xk8. Getting a "failsafe mode" warning. This is an XXXXX XXXXXght and the manual says it can still be driven in that condition, but I am concerned of what the problem might be and can this lead to a red warning. Any ideas
Country: United StatesMake: JaguarModel: XK8Year: 1998
Hello and welcome to justanswer.com
When the failsafe warning comes on the ECM (Engine Control Module) has detected a fault and may go into this limp mode. Since the warning message came on there will be fault codes logged in the ECM that will need to be read with a scan tool. You will need to visit a Jag specialist or dealer to have these codes read but first go to your local parts store like pepboys or autozone as they will scan it for you at no charge. Once you have the fault code numbers let me know what they are. On your vehicle I see issues with the electronic throttle, brake switch, air flow meter, knock sensors, and ignition coils causing this. The code will be a P followed by four digits like P0171 as an example. We really need to stored codes to pinpoint the problem.
This issue came about last fall before I stored it for the winter. Getting it out this "Easter" weekend and hope to have that code for you by mid-week.
Ok sounds good. Let me know how you make out.
12 years at a Jaguar dealer as technician and shop foreman.
Got two codes from autozone. They indicated several different manufacturers other than Jaguar, but the codes seem to be inline with what you're asking for: P1111, P1643. Hope this helps.
Thanks for the update. Can I have the last six digits of your VIN?
024064 Hope this helps.
This problem is caused by a fault in the CAN network. The CAN is the twisted pair network in which all the chassis and powertrain control modules "talk" to each other. These modules are the ABS, ECM, TCM, CCM, J gate, and Instrument Pack. If any one module is offline or has lost power or ground this problem will happen. On your vehicle I see issues with the J gate shifter module causing this. Diagnosing this without a Jag factory tool is difficult but next time the warning comes on look to see if the shifter illuminates the gear you are in. Other possibilities are low battery voltage or poor ground to the ECM and TCM.
You are very welcome.
When I was at autozone yesterday, the guy was getting an error message on his meter. He said that was usually due to a blown fuse. He checked 8 different fuses that were all good. After that his meter worked. The failsafe message would usually come on after about 5 minutes of driving. Today I wanted to see if the shifter illuminated as you mentioned and I put on 26 miles with no failsafe. If this were an electrical issue as you mentioned it may be, could re-seating a fuse have fixed it? I hope so.
Of course that is possible if in fact there was a poor connection at the fuse but I think the issue is more like an intermittent electrical problem.
I'll keep an eye out.
Ok sounds good.