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Old 09-15-2015, 12:58 PM   #26
skifreak85353
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Ok I'll give it a go.

This may be bad form to link to another board, but the OP has another thread going at http://www.wrxforums.com/forums/10-s...range-fix.html that has pics from other members and some deeper info. Thanks for getting this going 99pgpgt.
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Old 10-04-2015, 12:56 PM   #27
99pgpgt
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To go a step farther for the people that don't choose to follow the link skifreak has shared of my other forum thread, here are the pictures of the exposed wiring harness showing the ground wires and the connection where it needs to be soldered.







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Old 05-17-2016, 02:24 PM   #28
bottles
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Bringing a thread back from dead. I'm hoping this is my fix. I have been getting random misfires for a couple of weeks now. Last week it was 1,3,and 4 cleared the codes later that week it was just cylinder 3 but the roughness on all cylinder counts were high. This week its Cylinder 1 and 4 and my CEL popped up literally seconds after I started my car that morning. I sure hope this is it.
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Old 05-18-2016, 12:12 AM   #29
Celery GT-5
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Hey, I took those pics. Glad they are coming in handy.
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Old 08-25-2016, 01:33 PM   #30
teksimian
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2014 WRX w/ P0300 and intermittent rough idle.

Dealer has harness on order. I have my fingers crossed.

Cheers,
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Old 09-02-2016, 12:14 PM   #31
mr.temagami
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Wanted to share my results to help folks out. It was going to be a $1000 job to replace the wiring harness on my 2011 WRX. I did the soldering fix and the car has been running great so far (1 week, which is a huge improvement). Will keep monitoring.

For a bit more detail on the root of the problem, you can read about the revised wiring harness that is the official fix.

http://subaru.oemdtc.com/308/design-...12-2014-subaru
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Old 03-29-2017, 08:33 PM   #32
thegoodgetout
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Default Did you ever find the fix for this isssue?

Quote:
Originally Posted by skifreak85353 View Post
Is there a part number for the harness? Is this plug and play or do I need to take it to my shop or a dealer to handle?

This is driving me bonkers. Probably happens to me once a week. Car is running absolutely fine but this damn code gets thrown. Probably the most annoying thing about it is that I can't use cruise control and the dash looks like a damn christmas tree.

Here is the log from today's incident:

P0300
Random/Multiple Cylinder Misfire Detected

Status of this DTC
Confirmed DTC

Engine state when the fault appeared
Freeze frame trouble code: P0300
Fuel system status 1: Closed loop
Fuel system status 2: Unused
Calculated load value: 34.5 %
Coolant temperature: 150 F
Short term fuel % trim Bank 1: +1.6 %
Long term fuel % trim Bank 1: -4.7 %
Intake Manifold Pressure: 11.5 inHg
Engine RPM: 728 rpm
Vehicle speed: 0 mph
Timing advance: 18.0
Intake air temperature: 86 F
Maf air flow: 0.59 lb/min
Absolute Throttle sensor position: 14.5 %
Secondary air status: Atmosphere / off
Oxygen sensor voltage bank1 sensor2: 0.805 Volt
Short term fuel associated to bank1 sensor2: +0.0 %
Time since engine start: 217 seconds
Commanded evaporative purge: 0.0 %
Fuel level input: 69.0 %
Barometric pressure: 29.2 inHg
Control module voltage: 14.355 Volt
Absolute load value: 23.9 %
Fuel/air commanded equivalence ratio: 0.984
Relative throttle position: 3.1 %
Ambiant air temperature: 78 F
Absolute throttle position B: 31.4 %
Accelerator pedal position D: 13.3 %
Accelerator pedal position E: 13.3 %
Commanded throttle actuator control: 0.0 %

Report generated with EOBD-Facile App compatible with iPhone/iPad

Anything out of whack?
Did you ever find the issue for this? I already have the updates harness. My freeze frame is almost identical to your?
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Old 04-05-2017, 01:14 AM   #33
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Bringing this thread back to the top as I've just encountered this problem in my 13. It has 72k miles and i just got the code a couple of weeks ago. The car doesn't run/idle choppy and it doesn't appear to be misfiring. After bringing it to Suburban Subaru, they determined that the wiring harness is the issue, and when they wiggled the harness, the engine began to misfire. SOA is refusing to cover this and say that it isn't a widespread issue yet. Any thoughts on this? Has anyone else had this covered by SOA? i Feel SOA should be liable for a faulty wiring harness, whether it takes 5k miles for it to happen or 70k miles, a wiring harness isn't a wear and tear item. I even have extended warranty and they denied coverage. FYI, they want $1000 to fix this problem, $380 for the harness and the rest labor.
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Old 04-05-2017, 06:17 AM   #34
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Quote:
Originally Posted by Pepo View Post
Bringing this thread back to the top as I've just encountered this problem in my 13. It has 72k miles and i just got the code a couple of weeks ago. The car doesn't run/idle choppy and it doesn't appear to be misfiring. After bringing it to Suburban Subaru, they determined that the wiring harness is the issue, and when they wiggled the harness, the engine began to misfire. SOA is refusing to cover this and say that it isn't a widespread issue yet. Any thoughts on this? Has anyone else had this covered by SOA? i Feel SOA should be liable for a faulty wiring harness, whether it takes 5k miles for it to happen or 70k miles, a wiring harness isn't a wear and tear item. I even have extended warranty and they denied coverage. FYI, they want $1000 to fix this problem, $380 for the harness and the rest labor.
You're not under warranty. It's a pretty simple concept. You can always make a case to Subaru and try to get some assistance. You did, they denied helping you since you're out of warranty and they aren't obligated to assist you. Suck it up buttercup and pay the bill. They owe you nothing.
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Old 04-05-2017, 07:22 AM   #35
Celery GT-5
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It takes like 20 minutes to unwrap the wiring harness and put a drop of solder on the problematic​ connection...
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Old 04-21-2017, 05:30 PM   #36
dothatshht
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Going to be doing this to mine tomorrow. Someone actually told me about in on instagram of all places.

I've been throwing phantom cylinder misfire codes for a week now. Each time is a different cylinder or the p0300 random code.

No signs/feelings of a misfire. 100% throttle response. Just randomly turning the CEL light on when it feels like it.


Lets see if I am one of the lucky(unlucky) ones.
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Old 05-01-2017, 07:29 AM   #37
dothatshht
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1 week, 300 miles after this fix and I havent thrown a CEL since.
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Old 05-31-2017, 11:32 AM   #38
AcquaCow
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So my 2011 has been misfiring at idle lately and I wandered upon this and the WRXForums thread.

I wiggled/flexed the harness while the shuddering was going on and it definitely has an affect. Guess I'll be un-looming it and cleaning all the pins and soldering that crimp...
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Old 06-12-2017, 08:03 AM   #39
SJSC1608NJ
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My car is back at subaru for a p0300. Was there 3 weeks ago for the same cel. They replaced the wire harness, cel came back in a week ago. Got a call from them saying everything so far checks out, but will keep the car a few more days to check more out.
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Old 11-16-2017, 07:28 PM   #40
WRX15years
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My 2013 WRX got the P0300 first time about a year ago (November 2016) at 80,000 miles. It cleared itself before I did anything, but I ran some Techron and Heat through the tank and cleaned the MAF.

It popped up again at the 90,000 service in May this year. The dealer kept it and said they found an intake manifold leak and replaced the gaskets.

Popped up a third time October 2017 a little over 100,000 miles. I cleaned the MAF again, cleared it, and it came back. It's at the dealer now because I wanted them to fix it right (at their expense) if they didn't do it right the first time. They called and said manifold gaskets are fine, not leaks, and now they need to check valve clearance (sounds like valve lash) for 3 hours labor, if bad pull engine (!) and adjust valves.

I haven't gotten an answer yet as to any troubleshooting of the wire harness ground issue. I have asked the service writer, and was told I need to talk to the service manager. But the service writer said they called Subaru Field Tech Service and they said to check the valves.

I should have done the wire harness ground solder fix myself first, just to see if it worked. I'd like them to at least rule that out before doing exploratory surgery.

I really don't see how the valve lash gets smaller over time, as stuff wears, lash increases. And I don't see how it would affect all cylinders randomly with misfires.
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Old 01-25-2018, 01:17 PM   #41
JD33
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I've been having this issue for about 30K now. Where it would only show up every 10K, now its showing up every 2K.

Error P0300 / PFFFE.

Every single time I have to reset the ECU to clear the CEL.

Yesterday I actually drove with the CEL on in LIMP Mode and oddly it still achieved boost and ran very normal. I had the AP and didn't notice any adverse events during LIMP mode.

This morning I reset the ECU, but it's annoying b/c then it loses all of its learned parameters.

Disclosure, the short block was replaced at 60K (due to dealer negligence) which shortly there after this started occurring. I don't know if something happened with the wiring harness during this process.
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Old 02-09-2018, 02:31 PM   #42
yotaman423
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So I'm looking at doing this solder fix to my wiring harness as well. My question is, is it just the one joint in the harness or are there multiple joints that need to be soldered? Thanks
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Old 04-19-2018, 11:16 PM   #43
SFWRX2013
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Hey all,
This issue has been happening to me. Getting the P0300 code although the car drives fine. Dealer hasn't been able to indicate what the issue is. They just replaced the wiring harness, and 2 days later the code is back on. At this point they are recommending an engine tear down, "as it could have a tight valve clearance or a burnt out valve."

This issue started with my car at ~50k miles, and has been showing up intermittently for the past 15k miles.

Anyone have any other thoughts or experiences with this, beyond what a wiring harness replacement would fix?
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Old 04-19-2018, 11:27 PM   #44
2slofouru
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Seems like a very simple fix that can eliminate a lot of hassle. What I'm wondering though is if anyone's crimp at that location was actually loose, as in you could wiggle or slide the crimp. It appears to be several shields that share one ecu ground, for engine sensors. Just be sure to solder it well, hot enough so the solder flows into the joint and bonds well.




Quote:
Originally Posted by WRX15years View Post
My 2013 WRX got the P0300 first time about a year ago (November 2016) at 80,000 miles. It cleared itself before I did anything, but I ran some Techron and Heat through the tank and cleaned the MAF.

It popped up again at the 90,000 service in May this year. The dealer kept it and said they found an intake manifold leak and replaced the gaskets.

Popped up a third time October 2017 a little over 100,000 miles. I cleaned the MAF again, cleared it, and it came back. It's at the dealer now because I wanted them to fix it right (at their expense) if they didn't do it right the first time. They called and said manifold gaskets are fine, not leaks, and now they need to check valve clearance (sounds like valve lash) for 3 hours labor, if bad pull engine (!) and adjust valves.

I haven't gotten an answer yet as to any troubleshooting of the wire harness ground issue. I have asked the service writer, and was told I need to talk to the service manager. But the service writer said they called Subaru Field Tech Service and they said to check the valves.

I should have done the wire harness ground solder fix myself first, just to see if it worked. I'd like them to at least rule that out before doing exploratory surgery.

I really don't see how the valve lash gets smaller over time, as stuff wears, lash increases. And I don't see how it would affect all cylinders randomly with misfires.
Valve lash can decrease as the valves settle further into the seats, that's why it's a great idea to get a valve adjustment if you can swing it. I've seen it happen on vehicles with way fewer miles than yours, sometimes the clearances are set on the close side from the factory and after settling in they are way too tight. Can cause misfires at cold starts and if they are really tight it will continue after warm. The clearance being too low also causes an overall loss of power. I'm actually planning on checking clearances on my built motor after around 30k to see if they've dropped enough to worry about.
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Old 04-23-2018, 04:46 PM   #45
SFWRX2013
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Wouldn't there be a pretty obvious difference in the way the car is driving if this was really happening (ie not a faulty sensor, but actual misfires)? Something like a big difference in power, car sputtering or obviously running rough...?
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Old 05-08-2018, 11:44 PM   #46
GWFLARE
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About 8 or 9 months ago I had a very similar misfire problem, I had the codes for cyl 1 misfire and coil a. I replaced the coil, and changed all sparkplugs. No change. Ran across this page, and tried the fix, worked at first, but now after these 8 or so months, it has appeared again. I tried adding more solder, as well as changing the spark plugs again thinking maybe I gapped them wrong (or didn't put NGK's in), but to no avail. I've now been driving with the misfire for about 2k miles, and the strange thing is how absolutely inconsistent it is. I went 2 weeks out of the blue without a hitch. I went a week where I didn't go more than 2 hours without it missing. My only thoughts are either there's possibly another ground point that's maybe come loose as well, or perhaps it's because it only has one fuel filter in the fuel tank, which I would imagine is nothing more than just a sock to catch the big stuff. I may at some point pull the tank, depending on my findings. If anybody knows anything, please, I'm just a broke 21 year old trying to save some money so I can keep driving the car I love and not have to give it up for good.
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Old 05-10-2018, 07:16 AM   #47
point78
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Quote:
Originally Posted by GWFLARE View Post
About 8 or 9 months ago I had a very similar misfire problem, I had the codes for cyl 1 misfire and coil a. I replaced the coil, and changed all sparkplugs. No change. Ran across this page, and tried the fix, worked at first, but now after these 8 or so months, it has appeared again. I tried adding more solder, as well as changing the spark plugs again thinking maybe I gapped them wrong (or didn't put NGK's in), but to no avail. I've now been driving with the misfire for about 2k miles, and the strange thing is how absolutely inconsistent it is. I went 2 weeks out of the blue without a hitch. I went a week where I didn't go more than 2 hours without it missing. My only thoughts are either there's possibly another ground point that's maybe come loose as well, or perhaps it's because it only has one fuel filter in the fuel tank, which I would imagine is nothing more than just a sock to catch the big stuff. I may at some point pull the tank, depending on my findings. If anybody knows anything, please, I'm just a broke 21 year old trying to save some money so I can keep driving the car I love and not have to give it up for good.
There is a fuel filter built into the pump housing that sits in the fuel tank,( under your back seat-easily accessible ), along with a "pre-filter" sock on the pump itself.

It's pretty easy to change, search on here and you'll find a write up with part #'s.
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Old 05-22-2018, 03:19 PM   #48
SJSC1608NJ
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Next month will be a year with this issue. Went off for a long time came back on. replaced the only thing i replaced to begin with. Spark plugs. When the cell came back on before i replaced the plugs again, it was misfiring 2,3,4. and that pfffe. So far after replacing plugsw no issues. I have been monitoring the roughness cycle of each cylinder to see if any keep on running. Hasnt come back up, losing hope here. lol
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