Failsafe engine mode light comes on, then mechanic finds nothing
On my 2000 Jaguar XJ8 VP, the "failsafe engine mode" light came on...with TRAC and ACS disabled warnings. So car only goes about 20 - 30 mph. Did this 2 consecutive days. When I took it in, they turned it off, then on and it no longer does it. Runs normallly. Computer test finds nothing, except maybe throttle sensor A malfunctioning. About a month ago, the "low antifreeze" warning came on, but shen I pulled in a station and bought antifreeze, they said it looked fine. So I wonder...is it the sensing mechanism that is malfunctioning? I hate to drive too far in case...
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42 miles with a jaguar. First I love Jaguars. Youll get to your home by a tow truck. The car is talking to you say its sick.Here is what will happen, The TRAC, ASC, light is on okay the APP will now go to limp home mode what this mean it will default giving limited operations, youll probable just go 30mph, and that is just it. The transmission does not know what gear or how fast its going so it communicates to the powertrain it tell it I dont know what Im doing so it activates the traction control and say keep me safe the traction control say okay Ill get disable, then the transmission control tell the powertrain I could be burning up or slipping. So The APP(acclerator pedal position ) gets involved and say we will just limp on home.Remeber i love juguars so does tow trucks
My 1999 Jag XJ8 did the same thing when the cruise control was activated (red button by the gear shift), but I wasn't actually using the cruise control. I deactivated the cruise control and the fail safe message no longer appears.
The failsafe mode can appear following numerous faults being detected - some faults can be momentary and register but not cause a problem. These are normally reset by just turning ignition off/on. get the fault code memory read at a garage and this may give you a clue as to a possible problem developing. Failsafe mode will give you reduced engine performance but will allow you to drive for normally some distance. If a serious problem developes your car message centre will tell you to shut off the engine or it will shut it down.
Just a quick mention - for about a month my XK8 low coolant light came on intermittently. This week with no notice while driving normally I got Stability Control Fail and FailSafe Engine Mode and wtih great difficulty got the car back to where I started from (less than a mile). Two days later (when got time) and after a bit of research, I tried it again - same problem and a very unhappy engine. I then disconnected the battery for 15 minutes (probably more) to clear the engine codes as well as check all the wiring and vacuum stuff I could under the hood (at a Jaguar master mechanic's recommendation). No problems found but the car would start and immediately stall with the air intake hose disconnected from the intake butterfly. After I reconnected the air intake hose, she started and purred like normal. The problem is the BATTERY... It is low - I've known it for a LONG time BUT it always started right up and never skipped a beat. I intend to replace it tonight but fully expect that's the issue. I've had the car 6 years (it's a 98) and had NO problems except a dead taillight asembly.
Probably, your ZP HP-series transmission has failed. You didn't mention your car's mileage but failure is common from 60K - 120K miles. The "lifetime" synthetic fluid accumulates metal dust beyond the filter and magnet's ability to capture it, and sudden and catastrophoic failure occurs. Find a good independent shop (check your local Jag club) and they'll replace the transmission for around $6,000. The dealers charge twice that.
The other possibility is failure of the secondary cam chain tensioners. If you hear a clattering sound when you start the car, turn it off immediately and have the car transported to a good Jag shop. They can replace the plastic tensioners with metal ones for around $3,000. (Rough guess.) Make sure they do the same with the plastic primary tensioners and chain guides, and replace the chains. Failure to take this step after you hear the first symptoms will result in engine failure.
Also replace the plastic water pump and thermostat with alloy units.
Sorry for this bad news. I own a 2001 XJR and it is a fabulous car. It's still a Jaguar, though, and you're going to have to put a few thousand into it. Since these cars are selling for next to nothing on the used market ($12,000 for 80,000 miles), I consider preventive maintenance of $5,000 or so to be part of the investment in a world-class sedan.
I had the same issue...I went to Auto Zone and got a diagnostic...Came
back that my Throttle Position Sensor was faulty...However after taking
it to the dealer, and paying 135.00 for THEIR diagnostic...You can't
simply buy the sensor. You have to buy a new Throttle Body at 902.00 +
Tax atleast here in Vegas. I hope it's not your problem, but go get a FREE diagnostic first.