CX-5 Stopped on the Highway

[clownshoes2]

Welp, I was driving on the highway and I got a little sputter then the CX-5 went into limp mode.

After a $368 dollar tow to the garage it turns out that there is a code for a fuel pressure switch that is attached to the fuel rail.

My guy said that there may be a chance he can just swap out the switch without having to do the whole fuel rail. They don't just sell the switch (sadly). AND they don't sell the fuel rail third party, or at least he can't find it.

Worst case I get a new fuel rail including switch for ±1k, Best case is I get a new fuel pressure switch for 600 plus 1 hour labour.

Oh and the best part is the Mazda trouble tree says if this doesn't work, it's the main computer that's bad.

Ugh.

 

[Mazdiod2]

Pretty strange... how many miles, etc? Any issues buying fuel lately? I wonder what could prompt this kind of problem.

 

[clownshoes2]

It was super cold today well into the -20's with the wind chill. Maybe that's what helped the switch die. No issues with fuel. Always buy from Costco or other brand name stations. The mechanic said that this is fairly a common issue. Maybe not with specific brands but he's definitely heard of this repair before.

 

[Mach1tosh]

I was driving on the highway and I got a little sputter then the CX-5 went into limp mode.

Sounds like it pulled a "Truedeau" on you...

 

[Lazy2.5]

what's the mileage?

 

[clownshoes2]

what's the mileage?

188K Kms

 

[ceric]

I don't think this is a common problem w/ CX-5.
Maybe at some point, bad fuel got into the system.
Do you run it low often before refill?
Maybe time to check/replace fuel filter also at 188k kms.

 

[Lazy2.5]

I don't think this is a common problem w/ CX-5.

No, it's not. Unusual to happen at this mileage, but not entirely unheard of either .

 

[Jmaz]

Rather than being a pressure switch I think it's a fuel pressure sensor that's integral to the fuel rail and reports fuel pressure to the PCM. Have a hard time believing it's a common failure, at least among the skyactiv engines. For as long as I've been a member here this is the first time I recall hearing of a failure of this part.
Since it's at a shop now, I guess it's rather academic at this point, but plugging in an OBD scanner with live data should show if the sensor is functioning when revving the engine. Doing this showed me that the fuel pressure is indeed able to reach 2900 PSI.

 

[clownshoes2]

Rather than being a pressure switch I think it's a fuel pressure sensor that's integral to the fuel rail and reports fuel pressure to the PCM. Have a hard time believing it's a common failure, at least among the skyactiv engines. For as long as I've been a member here this is the first time I recall hearing of a failure of this part.
Since it's at a shop now, I guess it's rather academic at this point, but plugging in an OBD scanner with live data should show if the sensor is functioning when revving the engine. Doing this showed me that the fuel pressure is indeed able to reach 2900 PSI.

That's what they did. They plugged it in and followed the Mazda trouble tree. I mean, they're a reputable garage, we're not talking a guy in a home garage with a multimeter.

Also, they did mention that this problem is common. Maybe not with Mazda so much but also with other car makers. It's definitely not a rare occurrence.

 

[Lazy2.5]

Also, they did mention that this problem is common. It's definitely not a rare occurrence.

As @Jmaz mentioned, with the Skyactiv's it is. Very much the first time i've ever heard of this failure on our cars.

 

[clownshoes2]

As @Jmaz mentioned, with the Skyactiv's it is. Very much the first time i've ever heard of this failure on our cars.

Read my message further down where I clarify and say, maybe not on Mazda's but with vehicles in general, it's something that CAN happen.

 

[Lazy2.5]

Read my message further down where I clarify and say, maybe not on Mazda's but with vehicles in general, it's something that CAN happen.

Yes, hence my mention, "with the skyactiv's." This is a chat about the Skyactiv Mazda, after all.

Can't be compared to "general vehicles" if speaking of quality and engineering.

 

[clownshoes2]

Yes, hence my mention, "with the skyactiv's." This is a chat about the Skyactiv Mazda, after all.

Can't be compared to "general vehicles" if speaking of quality and engineering.

You're just being obtuse at this point.

I had a problem, I told you all what it was. If you want to debate the validity or the frequency of this diagnosis, feel free to go start your own thread.

All I'm doing is keeping people abreast of what may or may not happen to their CX-5's.

 

[Lazy2.5]

Also, they did mention that this problem is common. Maybe not with Mazda so much but also with other car makers. It's definitely not a rare occurrence.

All I was saying is that, this is not true for our cars.

You're right. Enough of this. Carry on.

 

[clownshoes2]

They replaced the switch, no codes came back and the vehicle seems to be running fine. If anything else happens, I will keep you posted.

 

[N7turbo]

They replaced the switch, no codes came back and the vehicle seems to be running fine. If anything else happens, I will keep you posted.

Thanks for that.

There was a poster last year who said their engine and transmission disconnected from each other on the highway. There was lots of speculation and bewilderment. But only one post, and they never came back to fill us in.

 

[clownshoes2]

Thanks for that.

There was a poster last year who said their engine and transmission disconnected from each other on the highway. There was lots of speculation and bewilderment. But only one post, and they never came back to fill us in.

Oddly enough, my fuel mileage seems to be better. Before the breakdown I was about 10L/100kms now I'm running 8.5L/100kms. FWIW