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I see there is a historic issue with XFs shutting down on the freeway, and it usually comes down to the RCM or Crank Position Sensor. Sometimes the intercooler pump. My car has been breaking down on the freeway every day, but if I park and turn it off and on it works fine again no problem. What is the most likely part that has failed? I am strapped for cash so I would like to tackle the most likely culprit first.
Last edited by Tundra; May 15, 2025 at 02:27 AM.
Reason: More information
Check for fault codes. P0335 is the CPS. Here's one check for the RCM but if the problem is intermittent it might not show up this way.
I can refurbish your RCM to eliminate any issues related to it. Where in AZ are you?
The two relays shown do in fact open when the car is set to the On position. I am in Winslow AZ, close to Flagstaff.
You might want to quote tighed1 in your reply so that he will see it.
It sounds to me like the CPS. The car is running it gets hot and shuts down. Then you pull over, it cools down and starts again.
That's just my opinion though. If you do replace the CPS use a Bosch part.
Here's a post I did when I replaced mine: LINK to CPS replacement
Funny thing, I just experienced the exact issue yesterday. 08 SSB roadster, 85,000 km, Canadian eh! Stuck in stop and go construct traffic, stopped shortly after for gas. Car started then died on the road a block away. From what I have learned from this amazing forum as follows: car would crank but not start, turned the key to on to verify fuel pump, turned key on and waited to hear if fan went to warp speed which now led me CPS. Car cooled for about 10 minutes and it started. Only about 6 blocks from home so made it home. Tried to start car would only crank. Poured water on CPS, started right away. Scanned codes, P0335, CPS. Retrieved my Bosch sensor from the trunk and thanks to the advice from the forum, swapped out the sensor in about one hour and all is great!
The spare sensor is a must but I now will make sure I carry a couple of bottles of water in the trunk.
Immense thanks to the forum members and the tip from tank driver to tape the bolt to the socket when reinstalling.
Car breaking down on freeway
