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Old 08-23-2012, 08:33 AM   #51
erik11876
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Quote:
Originally Posted by MortySnerd View Post
All,

Just a bit of bad news - after having been totally fixed for several weeks - the longest I'd ever seen it not move at all since it started being a problem - it slowly but surely started moving again. It's not nearly as bad as it was before, but it's definitely doing funky stuff again.

I wonder if maybe the solder they use for the wiring harness is substandard and getting melted slowly by engine heat?
Unless your engine is hitting temps of +400 degrees F, your good. I could be they didn't clean off the fluxing agent well enough and contaminants have made a high impedance short between the two conductors. That would be my guess.
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Old 08-23-2012, 09:24 AM   #52
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Originally Posted by erik11876 View Post
Unless your engine is hitting temps of +400 degrees F, your good. I could be they didn't clean off the fluxing agent well enough and contaminants have made a high impedance short between the two conductors. That would be my guess.


You can warp an aluminum head at far lower temperatures than 400* F. Ask me how I know. He also wasn't complaining about overheating, he was complaining about a temperature fluctuation---either real or a result of a faulty sensor/wiring.
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Old 08-23-2012, 10:27 AM   #53
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Originally Posted by bicycle_wreck View Post


You can warp an aluminum head at far lower temperatures than 400* F. Ask me how I know. He also wasn't complaining about overheating, he was complaining about a temperature fluctuation---either real or a result of a faulty sensor/wiring.
He was ASKING ABOUT SOLDER MELTING! It WILL NOT melt at 180 degrees F, I've worked in electronics for a long time now.


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Old 08-23-2012, 11:18 AM   #54
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I think it's safe to say I misinterpreted your post, which is my mistake.

I thought you were dismissing the temp fluctuation as a problem. The context for your response was in the post you quoted, not in your actual post, so I suffered a reading comprehension fail. This is me promising not to read threads using the phone app anymore.
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Old 08-23-2012, 11:24 AM   #55
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Originally Posted by bicycle_wreck View Post
I think it's safe to say I misinterpreted your post, which is my mistake.

I thought you were dismissing the temp fluctuation as a problem. The context for your response was in the post you quoted, not in your actual post, so I suffered a reading comprehension fail. This is me promising not to read threads using the phone app anymore.
Hahahaha, iPhone app or Android?
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Old 08-23-2012, 11:25 AM   #56
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Android. Again, sorry.
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Old 09-03-2012, 02:36 PM   #57
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Well its not faulty sensors ive had my thermostat and coolant temp sesnors changed under warranty and it didnt make any difference. My dealer is stumped as well. Starting to sound more and more like the head gasket from previous posts. Anyone else have any other ideas?
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Old 09-19-2012, 09:58 AM   #58
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I just noticed on a highway trip that gauge was hanging around one dash mark below half. It then jumped up to half, and then right back down one dash. Couldn't film it since I was on the highway, so no proof. And it only seemed to happen once. Anybody get a fix for this yet?
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Old 09-19-2012, 01:00 PM   #59
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Originally Posted by tank the ek View Post
I just noticed on a highway trip that gauge was hanging around one dash mark below half. It then jumped up to half, and then right back down one dash. Couldn't film it since I was on the highway, so no proof. And it only seemed to happen once. Anybody get a fix for this yet?
What year and model car? Also, your location? Fill out your profile.

My dealership got a Field Service Engineer out to look at mine. Engineer couldn't figure it out either. I'm putting together something for SOA, but I've been working like a dog so I haven't really gotten around to it.

Dealership tech replaced the thermostat, didn't make a difference. He took quite a few logs of the temps and sent them to SOA. They said they don't have a fix, but are looking into it. Apparently when the dealership tech called the Subaru Tech Line, no one had heard of this problem. However, the field service engineer said he had seen it before, but wasn't aware of a fix.

I should also say that my temp gauge needle moves only slightly (about 1 notch below the middle when coasting down a hill), unlike the video in the OP. There may be two distinct problems here.
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Old 09-20-2012, 10:53 AM   #60
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What year and model car? Also, your location? Fill out your profile.

My dealership got a Field Service Engineer out to look at mine. Engineer couldn't figure it out either. I'm putting together something for SOA, but I've been working like a dog so I haven't really gotten around to it.

Dealership tech replaced the thermostat, didn't make a difference. He took quite a few logs of the temps and sent them to SOA. They said they don't have a fix, but are looking into it. Apparently when the dealership tech called the Subaru Tech Line, no one had heard of this problem. However, the field service engineer said he had seen it before, but wasn't aware of a fix.

I should also say that my temp gauge needle moves only slightly (about 1 notch below the middle when coasting down a hill), unlike the video in the OP. There may be two distinct problems here.
Sorry man, I'm a slacker when it comes to all of these forums. I'm all over the place.

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Old 09-22-2012, 10:14 AM   #61
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Just a question searching back through this thread. Has anyone tried replacing the rad caps on the rad and turbo reservoir? I am just wondering if this might be related to crappy oem rad caps. Mine has a minor fluctuation from day one, but I've logged it via accessport and in traffic I've never hit above 190, sometimes it's dipped as low as 170 while cruising which is too low to be efficient.

Gurus that may read this, what is the sender for the gauge and ECM? Is it RTD or a bi metal thermocoupler? Transient changes that are fast can be picked up by thermocouplers but RTDs are slow to react but far more accurate. If guys are seeing transient changes that are fast but an RTD is in place the wiring could be crappy or the loop amplifier at the ECM has a problem. If it has a thermocouple than the issue could be air bubbles or a sticky thermostat.
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Old 09-26-2012, 10:19 AM   #62
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Quote:
Originally Posted by bicycle_wreck View Post
Taking my car in tomorrow for the fluctuating temperature gauge again.

Description:
My car will warm up to one notch below the middle mark in about 5 minutes. After that, it will only reach the middle mark if I come to a stop. After it reaches slightly above the middle mark (usually at an intersection), it stays there unless I drive above 50mph for a few minutes or coast down a hill in 4th or 5th gear. Then the gauge will drop as much as 1 full notch depending on the length and grade of the hill. The gauge will then rise back above the middle notch next time I come to a stop.

If I am running the A/C, this is far less likely to happen for whatever reason, and the gauge will usually stay on the middle mark. I mostly notice the fluctuation when the A/C is off.
Quote:
Originally Posted by bicycle_wreck View Post
My dealership got a Field Service Engineer out to look at mine. Engineer couldn't figure it out either. I'm putting together something for SOA, but I've been working like a dog so I haven't really gotten around to it.

Dealership tech replaced the thermostat, didn't make a difference. He took quite a few logs of the temps and sent them to SOA. They said they don't have a fix, but are looking into it. Apparently when the dealership tech called the Subaru Tech Line, no one had heard of this problem. However, the field service engineer said he had seen it before, but wasn't aware of a fix.

I should also say that my temp gauge needle moves only slightly (about 1 notch below the middle when coasting down a hill), unlike the video in the OP. There may be two distinct problems here.
Taking the car back to the dealer on Friday. They're going to have another look at the temp gauge while they investigate the TOB noise I've been having in the morning.
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Old 11-10-2012, 09:50 PM   #63
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I've been having the same issue with my 2011 WRX. It's stock (except for an SPT catback), and I started to notice the temperature gauge fluctuations a couple months back (currently around 21,300 on the odo). I scheduled an appointment to get it checked out on Monday, and today I shot this video of the problem:


I've also experienced the same bucking/surging under light throttle like rxfuel described, so I'm hoping they will be able to fix both of those issues at once.
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Old 11-10-2012, 11:25 PM   #64
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There's a post about this issue somewhere around here, no real conclusion the remedy this issue though. I'm sure if you search you should be able to find it
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Old 11-11-2012, 01:23 PM   #65
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The issue is clearly an electrical glitch. There's no way coolant changes temp that fast. A simple gauge like the Torque App can show the coolant temp at the ECU in realtime. Viewing what's happening with the coolant gauge while seeing what's being reported coolant temp could probably answer a lot questions.

My guess is the gauge cluster is the culprit.
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Old 03-27-2013, 12:50 PM   #66
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Any updates guys? Im starting to some fairly constant bouncing and more hesitation latrly since temps have been a little warmer...im unsure what to do anymore and it worriea me...
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Old 08-10-2013, 02:06 PM   #67
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Its a poor connection at the wiring harness. Tap on it and or loosely jiggle wires there and i bet the problem jumps out at you. At least it did for me. Your feedback is apprecciated
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Old 11-21-2013, 11:14 AM   #68
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Thought I would toss my current ongoing experience in on this as it seems similar.
Stock 2011 WRX
Moving temperature needle with error code p0128.
First indication of problem at 16,000 miles.
In and out of the shop for three months. with outside temp initially at 90+f now going from 40 to 50f.
Error seems to occurring more predictably as the outside temperature decreases.


My issue started with randomly getting a P0128 error, with the outside temp over 90f. After getting the error a couple more times ended up at the dealership where they changed both coolant caps, neither where holding pressure, and paying close attention to the engine temperature. I started noticing the engine would stay around 165f but would occasionally spike to 175f if I was driving 45 mph+ without much stopping. If I was sitting in traffic or doing stop and go driving through residential areas the highest I noticed the temp go was ~180f.

Another trip to the dealership and they replaced the sensor for the temperature gauge, but I had the same issue with the temperature. Third trip to the dealer they changed out the thermostat, but two days later I got the error code again and now my car is living at the dealership while they try to figure it out.

I'll ask about lose wiring and hopefully remember to give an update if I get a solid solution in case anyone else stumbles upon this thread with the same issue.

UPDATE #1 got off the phone with the dealership and they have looked into loose wiring but where unable to duplicate the problem with any amount of jiggling and tapping or wires and gauges, this was part of their troubleshooting already. Currently they got their monitoring hardware hooked up and are trying to catch as much data is they can while driving.

UPDATE #2 In the monitoring of the cooling system that the dealership has done while driving my car they are reporting that the engine and coolant temperatures are all within spec. As far as they can determine the cooling system is functioning normally and they believe the issue with the monitoring. The dealership is trying to get the P0128 error to post while driving so they can capture the data that is coming through at the time of the error. I am not to sure on why this would be different then what data they can capture while driving or why when I monitor the temperature my reading are showing, on average, below what the thermostat should be regulating at. My next update from the dealership will be on Monday.

UPDATE #3 Nothing new to report, currently stuck in a loop of the techs at the dealerships trying to get the error code to capture data.

UPDATE #4 The dealer has called in a field service engineer who reports that gauge movement is normal. The folks at the dealer don't buy that but they are giving me my car back. The idea being that the right driving conditions will cause the error to come back.

Last edited by Mercurious; 11-27-2013 at 01:49 PM.
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Old 11-21-2013, 03:51 PM   #69
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Quote:
Originally Posted by rockerryan View Post
I've been having the same issue with my 2011 WRX. It's stock (except for an SPT catback), and I started to notice the temperature gauge fluctuations a couple months back (currently around 21,300 on the odo). I scheduled an appointment to get it checked out on Monday, and today I shot this video of the problem:

http://youtu.be/2OOYwjjJ6dM

I've also experienced the same bucking/surging under light throttle like rxfuel described, so I'm hoping they will be able to fix both of those issues at once.
We have the exact same car, 2011 WRX stock besides SPT CBE 28k miles. I am also experiencing exactly this. First time I took it into the dealership they said they found loose oil in the turbo and intercooler so they went ahead and replaced the turbo.

Since then the idle and bucking has not been as violent as it was before they replaced the turbo. But I still am getting it.

My car is currently at the dealership being looked at, and so far they cannot find a cause as to why it's acting the way it is.

Once I find out more details I'll post back with any type of useful information. I'm just glad I'm not the only one!
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Old 02-26-2014, 09:46 AM   #70
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Quote:
Originally Posted by rockerryan View Post
I've been having the same issue with my 2011 WRX. It's stock (except for an SPT catback), and I started to notice the temperature gauge fluctuations a couple months back (currently around 21,300 on the odo). I scheduled an appointment to get it checked out on Monday, and today I shot this video of the problem:

http://youtu.be/2OOYwjjJ6dM

I've also experienced the same bucking/surging under light throttle like rxfuel described, so I'm hoping they will be able to fix both of those issues at once.

I am bumping this up for any updates or others have similar problems. I just started a new thread because I didn't see this one until now. My car is doing exactly the same things as these videos.

I swear there was a TSB about this, can anyone confirm?
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Old 03-31-2014, 11:35 AM   #71
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Possible helpful update. after My last update they got a data recorder from corporate to hook up to my car since their test drive could not get the CEL. I drove around for a week got the error and they sent the recorder off to Japan. About a month and a half later it come back that they could not find anything in the data log but they decided to replace the coolant crossover piping.

Since I got my car back, three days ago, the cruising temp has been about 175f (just below the halfway mark on the gauge) with no fluctuation. This is above the temp for the CEL trigger; it it also about the same cruising temp that the loner NA Impreza.

I plan on continuing to monitor the coolant temp to see if anything changes after getting a few more miles on the new parts.
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Old 03-31-2014, 02:22 PM   #72
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Interesting and thanks for sharing. I keep my AP in the car to monitor temps etc all the time now.

My car still does this from time to time as well as throws CEL P0451 at the same time. After a couple days it goes away......very weird
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Old 07-12-2014, 07:40 PM   #73
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P0451 FTW...2014 WRX Limited with...4,800 miles....taking it into the dealer first thing Monday.
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Old Yesterday, 07:41 AM   #74
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Originally Posted by DesertScooby View Post
P0451 FTW...2014 WRX Limited with...4,800 miles....taking it into the dealer first thing Monday.
Good luck, my CEL comes and goes. So far the best guess is a pressure sensor. I think this is a fairly common problem, I hope a TSB comes out soon to fix it, it is more annoying than anything.
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