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Discussion Starter #1 (Edited)
As the title suggests.

Popped a CEL on the way home from work today, ran the code with my bluetooth reader, came up P050A. Car has been sluggish for the past few days and really lagging when going into boost, as in I'll go WOT and it makes boost but just doesn't go and doesn't feel as quick as it did a week ago. Local dealer is closed so have to wait till tomorrow to get her in and check out what is going on.

Any thoughts as to what this may be? I'm still seeing "23psi" or so on the dummy boost gauge in the center stack, checked for vacuum leaks and don't see any that are obvious, idle is fine on the car. It is making an odd whiring noise upon startup that didn't seem to be there before, possibly a factor in this issue. That's about it, not much I can find on the internet for this particular trouble code and my bluetooth reader just states "manufacturer defined"

Thoughts? Thanks in advance.

VIN NUMBER: WF0DP3TH5G4114639

TIMELINE:

8-26-2016: Update:

Took the car to the dealer on 11th of this month and they ran through the above process, reset the code, cold start, idle, test drive and the MIL did not return so they released the car back to me.
Flash forward to yesterday, two weeks and 1100 miles later. Wife had the car and was leaving work, pow, MIL back on, same P050A. Called the dealer and got her in today to get looked at. Master Tech got the car this time and suspects a bad throttle body, apparently Ford is notorious for crap electronic TBs, so he ordered a new one and did the update to the PCM that has been discussed here. Downside is the throttle bodies are backordered right now. He's hoping by putting an emergency ship on it we will see it mid next week. Worst case is Labor Day week which is bad for me as I'm going to be in Lincoln for Solo Nationals, hopefully it doesn't go pear shaped out there if we don't get the new TB in time.

I'll update as this progresses.

10-5-2016: Update: In case anyone is having similar issues.

The throttle body was replaced as well as the primary O2 sensor the last week of August at a little over 5,000 miles on the clock. Since then the car made a little over 3,000 miles of flawless performance on the trip out to Lincoln and some sight seeing after Nationals. Fast forward to yesterday, CEL came back. Same code, P050A. It isn't exhibiting any symptoms as it was before, maybe slightly sluggish on WOT pulls every now and then.

Taking it back to the dealer today after work for diagnostics. I'll update accordingly as this progresses. Looks like its potential it lunched another TB hopefully. I'm not liking the alternatives...

10-25-2016: :bump: and bump...

The dealer had the car for a few days to run all the diagnostics again per Fords direction. Upon finding no issues, long story short they cleared the code and released the car back to me. Ford isn't sure what was going on with the car and basically said to record a log of all my driving cycles so if the code comes back it may be able to help determine what caused the CEL. Yeah, ok, I'll get right on that...

Fast forward to last Friday and about 1000 miles later. Leaving work, bam CEL. P050A. Called the dealer, dropped it off on Saturday.

Field Service Engineer is basically out of ideas, so his last suggestion before this is escalated higher up is to do a tear tag reflash of the system, replace the cylinder head temp sensor, and ambient temp sensor. Sensors should be in tomorrow and replaced and the car released back to me. The master tech and I both assume this is not going to fix the problem, but its Fords dollar and we basically have to try everything they are suggesting in order to drive this up the ladder. It's not putting me out anything as they have been providing wonder loaners such as automatic Fiestas and base level Foci, plus I'm quite interested in seeing what the final outcome of this is as I've never ran across something this persistent yet seemingly unsolvable. Maybe its the engineer in me but I'm actually enjoying this.

Either that or its Stockholm Syndrome with Foci...

I'll update when the inevitable CEL pops back up before I store her for winter.

11-1-2016: UPDATE!!

I'm getting the car back today. They replaced the sensors as well as did a pressurized leak down test on the entire system. Leak down test passed (yay).

Through this process, somehow this landed on someone's desk in Dearborn that took notice. So two things that came from this:

A: This has been determined as an "information code" and other codes should accompany it. My car is not exhibiting any symptoms lately and not displaying any other codes in fault log. Oasis is now flagged with a tracer by to my tickets. You guys can thank me for the legwork. haha
Dos: I said this made it on someone's desk in Dearborn. Well that someone is one of the engineers involved with the RS development and launch. (supposedly) Said person has stated that if the CEL returns they are either going to send some engineers down to the dealer to spend private time with my car and find a solution, or send a private carrier down to pick my car up and take it back to Detroit/Dearborn and fix it there. We shall see what happens with this one as time progresses.

Either way, I get the car back tonight and get to return the wonderful Fiesta I've been driving for a week and a half.

11-10-2016: And the hits don't stop...

Cel popped back on again on the way home from work last night, 551 miles since the last. Same code, P050A, surprise! I dropped the car off at the dealer this morning and got a wonderful ruby red Focus SE. Such fast, very wow, amaze.
Anyways, the dealer is waiting on what Detroit is going to say now. Stay tuned, this ought to get interesting as no one knows what the root cause for this issue is and rumor mill is that the car will go back to the motor city for a shakedown. I laughed, handed them the key fob, and walked away.

What else can I even do at this point? haha

11-18-2016: Update, again.

Got the car back on Wednesday after the most recent code clearing. Detroit decided they wanted to hook up a data logger to the car to capture the event as it takes place because my car is now a guinea pig. On the way home last night, a whopping 100 miles since the code was cleared, it popped back up, so yay for Ford getting their information logged. Took the car back to the dealer this morning and gave them back their data logger. The data is going to get pulled down and analyzed to see what is triggering the issue.

For now, no new information, but at least we had a recorder on the car when the CEL was triggered so hopefully they can figure out what the hell is causing this issue.
I'll update as I hear back from them. The car is getting put away here this weekend as we are expecting snow so updates will continue as information is relayed from the dealer.

1-4-2017: Severely late update

November 23rd 2016 I got a call back from the master tech at my local dealership that has been dealing with the problem since the get go. The data set was analyzed and a few parameters were found out of spec. You will have to forgive me as it's been two months almost since my last communication as I put the RS in storage the weekend before Thanksgiving due to it snowing and the salting of the roads. To my best recollection the fuel pressure and throttle load were reading inconsistent (sometimes negative when should be positive values). Ford directed the tech to have me bring the car to the dealer and check a few pinouts on a couple of the harnesses, and if the pinouts passed a resistance test hook the logger back up to the car and record the drive cycles.

Preliminary thoughts between the master tech and I are that the PCM is fubar'd, something is acting strange in it, be it a loose connection or a faulty item. Unfortunately at this time no further action has been taken as the car is tucked safely in my garage for the winter and I'm not about to take it out on the brine covered roads to slowly rust away.

I'm going to call the tech by the end of this week to try and get my RO number that is still open in hopes it may help individuals that are starting to experience this problem.

The first post is now updated with all my current information, including the timeline of events as well as my VIN number for your dealerships to reference as a case study of what has been done and doesn't work.

5-15-2017 Update:

Car was dropped back at the dealership on the evening of May11th after the CEL popped back on in the morning heading to work. Have about 1,000 miles on the car since she was put away in November for winter. Same code, P050A, noticeable stumble at idle during warm up. Dealer has had it for two days now, waiting for Ford to get back to them on how to proceed.

I'll admit, while in the beginning of this issue I was quite lax and laid back, I'm starting to get pissed, especially since this has been an ongoing problem since 3k miles and I'm up to 11k and change. Who's door do I have to start knocking on to get this escalated and fixed?

5-23-2017 Update:


Got the car back last Friday on the 19th. Ford directed the dealership to go into the main harness and splice/re solder the connections to make sure we weren't getting intermittent signal from bad wiring. The main harness that was repaired was the one feeding leads tot he throttle body, IAT, MAP, etc... Took the car home and it drove fine, went to a few autocrosses and it drove fine.

Wife took it to work this morning and about a mile down the road from the house the damn CEL popped back on. Heading back to the dealer tonight to scan and document the code.


I'm officially sick and effing tired of this. A buyback is being initiated on my behalf by the dealership. Ford can't get their crap together and is using my damn car as a guinea pig to poke and prod, well they can have it back and do all the testing they want on their damn time, not mine.
 

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That code is for "Cold Start Idle Air Control System Performance". Can't tell you much more than that.
 

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Discussion Starter #3
Yeah that's what I came across too. Doesn't explain the sluggish behavior and loss of power though. Unless in all of Fords magic they've managed to program the idle control to engine timing and throttle response.
 

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IAC is the throttle itself since it is drive by wire.
 

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How many miles do you have on the car? Sorry to hear it, but goes with the territory of buying a first generation car. I got the 2015 WRX the month it came out and it threw a CEL and went into limp-mode with ~1200 miles on the odometer. Very frustrating, but I'm sure the dealer will get you fixed up. Good luck, let us know what you find out!
 

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2.jpg

Straight from the Ford PC/ED workshop manual. Have a quick check of all those things before you bring it in. If you read the last little bit, it may actually just be a little glitch and clearing and retesting may be their fix. I doubt it's just a glitch though from what you said about a lack of power. Hopefully they can figure out what's up quickly for ya.
 

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Discussion Starter #7
View attachment 41577

Straight from the Ford PC/ED workshop manual. Have a quick check of all those things before you bring it in. If you read the last little bit, it may actually just be a little glitch and clearing and retesting may be their fix. I doubt it's just a glitch though from what you said about a lack of power. Hopefully they can figure out what's up quickly for ya.

Thanks. Looked over most of it last night, couldn't find any noticeable restrictions in the intake or exhaust track, will get a better look tonight as I'm getting my borescope back from a guy at work. I'm hesitant to clear the code for fear it doesn't come back and won't repeat so I scheduled an appointment for the dealer. If they clear the code and it runs fine at least its documented then for potential future issues, especially if the throttle body is acting up. I have enough other Foci to work on that this one goes in under warranty, haha.

Otherwise, the car idles fine and no noticeable valvetrain noises. A quick 1-2 pull from a stop light feels normal, just anything over 2nd gear dogs and feels like I'm hauling a loaded trailer behind the car. I dunno, hopefully it isn't much and it's just a reset and all systems go back to normal.
 

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Thanks. Looked over most of it last night, couldn't find any noticeable restrictions in the intake or exhaust track, will get a better look tonight as I'm getting my borescope back from a guy at work. I'm hesitant to clear the code for fear it doesn't come back and won't repeat so I scheduled an appointment for the dealer. If they clear the code and it runs fine at least its documented then for potential future issues, especially if the throttle body is acting up. I have enough other Foci to work on that this one goes in under warranty, haha.

Otherwise, the car idles fine and no noticeable valvetrain noises. A quick 1-2 pull from a stop light feels normal, just anything over 2nd gear dogs and feels like I'm hauling a loaded trailer behind the car. I dunno, hopefully it isn't much and it's just a reset and all systems go back to normal.
My guess would be throttle body. Happened to my mom's Fusion a few years back (not sure if same type of system). She was driving, went to put her foot down, nothing happened. Did it again and it would pull. Happened 2 or 3 times before she had it towed and they knew immediately what it was.
 

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Discussion Starter #9
Update:

Took the car to the dealer on 11th of this month and they ran through the above process, reset the code, cold start, idle, test drive and the MIL did not return so they released the car back to me.

Flash forward to yesterday, two weeks and 1100 miles later. Wife had the car and was leaving work, pow, MIL back on, same P050A. Called the dealer and got her in today to get looked at. Master Tech got the car this time and suspects a bad throttle body, apparently Ford is notorious for crap electronic TBs, so he ordered a new one and did the update to the PCM that has been discussed here. Downside is the throttle bodies are backordered right now. He's hoping by putting an emergency ship on it we will see it mid next week. Worst case is Labor Day week which is bad for me as I'm going to be in Lincoln for Solo Nationals, hopefully it doesn't go pear shaped out there if we don't get the new TB in time.

I'll update as this progresses.
 

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Discussion Starter #10
Update: In case anyone is having similar issues.

The throttle body was replaced as well as the primary O2 sensor the last week of August at a little over 5,000 miles on the clock. Since then the car made a little over 3,000 miles of flawless performance on the trip out to Lincoln and some sight seeing after Nationals. Fast forward to yesterday, CEL came back. Same code, P050A. It isn't exhibiting any symptoms as it was before, maybe slightly sluggish on WOT pulls every now and then.

Taking it back to the dealer today after work for diagnostics. I'll update accordingly as this progresses. Looks like its potential it lunched another TB hopefully. I'm not liking the alternatives...
 
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Thanks for the update! Keep it coming. :)
 
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yeesh. Why hasnt there been numerous threads about the poor quality throttle bodies already?
Surely we'd see more if the TB were all poorly made.
 

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Discussion Starter #15
yeesh. Why hasnt there been numerous threads about the poor quality throttle bodies already?
Surely we'd see more if the TB were all poorly made.
From what I gather, this is the first issue with the throttle bodies on the RS. Field service engineer actually had to get on the horn to Ford Performance and troubleshoot with their engineers. The electronic tb's are a known issue on other models (as some have noted here) so that's basically what they were shooting at first.

I find it comical actually, and I'm still having a blast with this car. By comparison to what I went through for the first model year 2000 Focus, this is a breeze.
 
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From what I gather, this is the first issue with the throttle bodies on the RS. Field service engineer actually had to get on the horn to Ford Performance and troubleshoot with their engineers. The electronic tb's are a known issue on other models (as some have noted here) so that's basically what they were shooting at first.

I find it comical actually, and I'm still having a blast with this car. By comparison to what I went through for the first model year 2000 Focus, this is a breeze.
what happened to your 2000 focus if you don't mind, mine was flawless for 90k except for a melted catalytic converter. miss that car. I really loved the 5sp trans
 
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what happened to your 2000 focus if you don't mind, mine was flawless for 90k except for a melted catalytic converter. miss that car. I really loved the 5sp trans
It's a long story, but within the first 30 days of signing the papers my car nuked two ECUs and a throttle position sensor. The car actually had the temp tags expire while in the service bay.

I had several DPFE sensor failures after that, an EGR valve failure, and among other things radio/front sway bar endlink/alternator/PS pump/cat/window motor failures all within the first 10k miles. Many of these were multiple failures. My car spent it's first year after being birthed mostly in the the service bay. Haha

This doesn't include all the recalls for the MY2000 cars. She was a February 2000 build with an April delivery, so I got the good intake manifold and the early mtx75 transmission with the dual blocker rings on the synchros.

I still have her though, even after all the warts. One hell of a car.

Hence, this is child's play with the RS. Haha
 

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Hate to double post, but just saw this reply after my last post and I'm too lazy to edit for a multi-quote. Sue me. Ha

Here's to hoping they find a permanent fix for ya soon. This is the type of stuff that is making me hold off on a tune.
Funny thing, the dealer had asked a few times if the car had been "modded". They claim that this code has been seen before on vehicles that have had aftermarket intakes and tunes on them.

I can see the intake being justifiable as vacuum leaks are plausible, but tunes, eh, unless some parameters are really effed for the cold startup I can't see it being an issue.

But I'm in the same boat somewhat, keep it stock till everyone else figures out what breaks, plus first year model warts showing their head.
 

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Hate to double post, but just saw this reply after my last post and I'm too lazy to edit for a multi-quote. Sue me. Ha



Funny thing, the dealer had asked a few times if the car had been "modded". They claim that this code has been seen before on vehicles that have had aftermarket intakes and tunes on them.

I can see the intake being justifiable as vacuum leaks are plausible, but tunes, eh, unless some parameters are really effed for the cold startup I can't see it being an issue.

But I'm in the same boat somewhat, keep it stock till everyone else figures out what breaks, plus first year model warts showing their head.

I think the dealer asks everyone that so they can get some beer money from you for the repair work.
 
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