Engine Failsafe Mode
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Some combination of inputs to (and perhaps monitored outputs from) the PCM when fed into its algorithms ends in a bad place where it can't figure which code(s) to flag but is also unable to control the engine in the way it normally can. It would flag code(s) if it could.
Any recent work is suspect. Failing that, maybe you can find a sensor whose value fools the PCM but which you can tell is wrong.
Any recent work is suspect. Failing that, maybe you can find a sensor whose value fools the PCM but which you can tell is wrong.
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#5
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I get something similar if and only if the car is outside in strong winds, and it does not do it every time.
Upon start will get the full Christmas Tree effect and not running well. Key off, wait one second, restart and all is good.
Every connector and wire checked. All connectors clean. Grounds checked. No collision damage. No prior messing around by unqualified techs or dealer.
My specialist ran the full dealer diagnostics and found nothing after an event. He came to my house. We have concluded that the wind is causing a static charge situation in some component.
Going to live with it. Sometimes it is better that way.
Upon start will get the full Christmas Tree effect and not running well. Key off, wait one second, restart and all is good.
Every connector and wire checked. All connectors clean. Grounds checked. No collision damage. No prior messing around by unqualified techs or dealer.
My specialist ran the full dealer diagnostics and found nothing after an event. He came to my house. We have concluded that the wind is causing a static charge situation in some component.
Going to live with it. Sometimes it is better that way.
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Join Date: Jan 2018
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#11
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Getting the module out is quite fiddly, but you'll save a couple hundred dollars if you DIY.
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zray (05-13-2024)
#13
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I have 2002 XK8 have had this issue on and off since about mid 2008 ( I am original owner). Dealer kept thinking throttle body and all sort of other things that never fixed it. Only happens in higher heat weather. Transmission fault light comes on car will not start. Lock car and wait a few minutes and then it works. Was once thought to be soldering behind dash and in higher heat, wires touched. That was fixed and happens rarely but still does when outside temps high. I live in AZ and only drive it 20 mi/week OCT-May now.
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