Keith Browning Posted November 30, 2007 Share Posted November 30, 2007 P0128 is the stuck thermostat code that was turning on the Check Engine light on early build trucks. Apparently the parameters were too narrow for warm up time. This was corrected with a recalibration some time ago. I actually had a handful of trucks come in with this code and cured it with the calibration. I had one such truck in a few weeks ago and flashed it. Came back today with the P0128 in it. The pinpoint test for the code has you clear the code and perform the KOEO and KOER self tests. No codes means "unable to duplicate." In my opinion the PCED totally throws caution to the wind. Okay. I decided to review all of the testes and decided to monitor ECT and EOT temp and volts. Normally a truck will reach 180-ish idling in the bay. Not tis truck. EOT maxed at around 122 degrees and ECT maxed out at 95 degrees. I raised the idle and the temps dropped, probably because one of the t-stats is stuck open and that fan that wont stop engaging kept the coolant temps down. Stats will be in tomorrow. Quote Link to comment Share on other sites More sharing options...
G. Bedford Posted November 30, 2007 Share Posted November 30, 2007 We have just had a rash of P0196 codes being set because of T-stats this last week. We also upsell a winter front to help them warm up faster. If you look at the Freeze Frame data they all set at the 10 minute run time mark around 1100 RPM/TP at 0%/VSS 0. Seems people fire'em off and go back inside to let the truck warm up and it takes too long. I wouldn't be surprised to see a re-flash happen here, too. Quote Link to comment Share on other sites More sharing options...
Steve Mutter Posted November 30, 2007 Share Posted November 30, 2007 just had one today,truck did not want to heat up and coolant and oil are sitting at 150, its droping down to about -25 at night now,I think ther will be more to come Quote Link to comment Share on other sites More sharing options...
DieselD Posted November 30, 2007 Share Posted November 30, 2007 interesting. We just had one of these the other day that we just did a program on and let it go. I was wondering if we where going to have this issue sooner or later. the gas engines, more in the rangers had issues with programming setting the p0128 codes. We probably wont see as many here in az as the cold states, we are only in the 65* here during the day, maybe 45s at night on cold nights. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted November 30, 2007 Share Posted November 30, 2007 We have '08 units on the lot stacking up like cord wood around here. There moving about as fast as Mustang GT's in January with 3 feet of snow on the ground. We live in a small area and people are kinda gun shy about the new powerplant. I think I have worked on a total of 3, one out of towner, one a lot unit with injector recall, and the boom truck. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted December 12, 2007 Author Share Posted December 12, 2007 We have just had a rash of P0196 codes being set because of T-stats this last week. We also upsell a winter front to help them warm up faster. If you look at the Freeze Frame data they all set at the 10 minute run time mark around 1100 RPM/TP at 0%/VSS 0. Seems people fire'em off and go back inside to let the truck warm up and it takes too long. I wouldn't be surprised to see a re-flash happen here, too. Had one today, same scenario. Talked to the Hotline and they know its an issue and are looking into it. As a matter of fact, look for a new SSM on it tomorrow. For me, the system tested good and no problems with the sensor. Advised to clear the code and release the vehicle, continue to monitor the PTS web site for a TSB with a reflash. By the way, customer uses a block heater AND starts the truck before venturing off in the morning... hasn't been below 25 degrees yet in NJ! /forums/images/%%GRAEMLIN_URL%%/icon_crazy.gif Quote Link to comment Share on other sites More sharing options...
Tony302600 Posted December 12, 2007 Share Posted December 12, 2007 Had one on Monday.... 10minutes, 0vss, 0 tp.. was told to check eot/ect correlation clear then ship.... fix is being created. Quote Link to comment Share on other sites More sharing options...
DwayneGorniak Posted December 12, 2007 Share Posted December 12, 2007 Got one here right now with P0196 and Hotline told me to change the thermostats. They also said to look for casting pourosity when I have the T-stats out. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted December 13, 2007 Author Share Posted December 13, 2007 And there it is! Quote: 0501 - 2008 F-SUPER DUTY 6.4L - DIAGNOSTIC TROUBLE CODES (DTC) P0128 AND P0196 SOME 2008 F-SUPER DUTY VEHICLES EQUIPPED WITH A 6.4L DIESEL ENGINE MAY EXHIBIT DTC P0128 ENGINE COOLANT THERMOSTAT AND/OR P0196 ENGINE OIL TEMPERATURE SENSOR CIRCUIT. IF NORMAL DIAGNOSTIC PROCEDURES DO NOT RESOLVE VEHICLE CONCERN DO NOT ATTEMPT FURTHER REPAIRS. ENGINEERING IS CURRENTLY INVESTIGATING. MONITOR OASIS FOR UPDATES. Quote Link to comment Share on other sites More sharing options...
LARRY BRUDZYNSKI Posted December 13, 2007 Share Posted December 13, 2007 So in other words put the truck out back and wait until they figure it out? Or is the vehicle driveable? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted December 13, 2007 Author Share Posted December 13, 2007 If the root cause of either code of a software issue, the truck is fine. I do recommend completing the pinpoint tests and verifying the cooling system operation. I did have one out of around ten with bad t-stats Quote Link to comment Share on other sites More sharing options...
Millsy Posted December 17, 2007 Share Posted December 17, 2007 I had one three weeks ago that I reflashed and came back afew days later setting the code and this time the customer said that it is was slow to come to operating temp. and intermitent no heat. Removed the thermostat housing and found one stat had not been latched down in the housing. I replaced stats and all is well. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted December 17, 2007 Author Share Posted December 17, 2007 How long did the stats take to do? I have parts waiting for a truck to return and finally read up on it. Looks like the shroud and fan have to come off and then the vertical EGT cooler bracket. That reminds me, I only ordered one clamp. I think it needs three. Quote Link to comment Share on other sites More sharing options...
Steve Mutter Posted December 17, 2007 Share Posted December 17, 2007 don't do it the way the book would have you do it,order one clamp and one bolt because it does not come with a bolt in the clamp kit,half of the time it takes you to do the job is spent trying to get the braket and the thermostat hosuing out,I have a hard time getting the themostat housing out and in Quote Link to comment Share on other sites More sharing options...
DwayneGorniak Posted December 18, 2007 Share Posted December 18, 2007 My truck came back yesterday with the same code. When I did remove the thermostats, the top one was badly scored. Hotline had me reflash the PCM this time though. Will most likely come back again. As Mutter said, don't remove the shroud. I just removed the right hand battery and degas bottle assembly. Then remove the bottom verticle EGR cooler bracket. The hold down for the thermostat housing is a bit tricky. Once you figure it out though, it's not that bad. You have to flip the back of the hold down up toward the front of the engine and turn it slightly counter clockwise and it will pull right off of the housing. Then the housing slides right out. I made money on that job. Took about an hour and a half for my first time. The next one will be much faster. However, the whole design of this engine is still "RETARDED"! WTF were they thinking? /forums/images/%%GRAEMLIN_URL%%/scratchhead.gif Oh yeah, right, they don't think. Computer designing and engineering does it for them. Looks great on a screen, right? /forums/images/%%GRAEMLIN_URL%%/icon_crazy.gif Quote Link to comment Share on other sites More sharing options...
LARRY BRUDZYNSKI Posted December 18, 2007 Share Posted December 18, 2007 It seems to me that Ford built this thing in pieces and didn't think about the service side. But like 6.0 it's all a learning curve. It will get better.. Quote Link to comment Share on other sites More sharing options...
Tony302600 Posted December 18, 2007 Share Posted December 18, 2007 However, the whole design of this engine is still "GAY"! WTF were they thinking? /forums/images/%%GRAEMLIN_URL%%/scratchhead.gif Oh yeah, right, they don't think. Computer designing and engineering does it for them. Looks great on a screen, right? /forums/images/%%GRAEMLIN_URL%%/icon_crazy.gif I would love for Dwayne to get a phone call from Ford stating...."you think its sooo easy...come to Deeetroit and assist us in designing the next diesel" We get that truck in our bay..... wiring harness has 3 inch thick insulation....no egr, or cooler... go to workshop manual to find out how to remove turbo... " step 1....go to fridge and get special service tool (labatts er crown)... step 2 unbolt 3 dem der mounting bolts....step 3 remove dem der turbo" /forums/images/%%GRAEMLIN_URL%%/rofl.gif Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted December 19, 2007 Author Share Posted December 19, 2007 Thank you Mutter and Dwayne. As mentioned it was trying my patience until I figured out how to get the steel clamp plate out but I got it. The upper t-stat was mangled! Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted December 19, 2007 Share Posted December 19, 2007 The upper t-stat was mangled! What do you mean by mangled? Broken? The "plate thing" popped out of the aluminum slots? Damaged on the assembly line? You had to mangle it getting it out? Just curious. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted December 20, 2007 Author Share Posted December 20, 2007 What do you mean by mangled? I mean, MANGLED! I did not do that to this thermostat. As a matter of fact, I tried to bend it back by hand and I couldn't. It's not a flimsy valve and the spring is not strong enough to bend it if something were to get caught in it and there were no marks on the rubber coating. This had to have been installed that way or damaged during installation. Anyway, the engine reaches full operating temperature now, ECT and EOT are much closer and maybe, just maybe her fuel economy will improve from 9 MPG. Quote Link to comment Share on other sites More sharing options...
LARRY BRUDZYNSKI Posted December 20, 2007 Share Posted December 20, 2007 Just a thought... Could this have been built around the time Ford and Nav. were having there little lovers spat. Re: lawsuit against one another and somebody might have been pissed off on the line? What's the engine build date? Was it around this time period? By the way that stat is really (f)trucked up!!! /forums/images/%%GRAEMLIN_URL%%/scratchhead.gif Quote Link to comment Share on other sites More sharing options...
eastendpowerstroke Posted December 20, 2007 Share Posted December 20, 2007 Just a thought... Could this have been built around the time Ford and Nav. were having there little lovers spat. Re: lawsuit against one another and somebody might have been pissed off on the line? What's the engine build date? Was it around this time period. /forums/images/%%GRAEMLIN_URL%%/shrug.gif Gee I think I might have heard that somewhere before. /forums/images/%%GRAEMLIN_URL%%/scratchhead.gif MAYBE HERE Originally Posted By: eastendpowerstroke lookie here "PowerStroke 6.4-liter Diesel March 1, 2007 Navistar International Transportation Company has been ordered by the court to resume building and shipping the 6.4L PowerStroke diesel. Earlier in the week, they had announced they were stopping production. Ford has always honored its agreements with Navistar, and will continue to take the necessary steps to resolve this issue. The Kentucky Truck Plant is operating on one shift today, and will be closed tomorrow. Production will resume on Monday, and the plant will return to its regular operation schedule as quickly as possible. We'll update you when we can provide additional information." if you think they were going to be problematic before wait till we start getting "COURT ORDERED" engines /forums/images/%%GRAEMLIN_URL%%/thumbup.gif /forums/images/%%GRAEMLIN_URL%%/hitthefan.gif Quote Link to comment Share on other sites More sharing options...
LARRY BRUDZYNSKI Posted December 20, 2007 Share Posted December 20, 2007 You rock!!! /forums/images/%%GRAEMLIN_URL%%/rockon.gif /forums/images/%%GRAEMLIN_URL%%/rockon.gif /forums/images/%%GRAEMLIN_URL%%/rockon.gif Quote Link to comment Share on other sites More sharing options...
Tony302600 Posted January 11, 2008 Share Posted January 11, 2008 All you guys that are getting the p0128 code with the messed up thermostats, is ure ect going above 170.6 degrees? Especially your's keith, did your messed up thermostat show weird ECT readings or just had a hunch? I have my first 128 ( the rest are 196's ) and my ECT stays dead at 170.6 - 172.2 at idle letting everything stabilize. j/w Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted January 11, 2008 Author Share Posted January 11, 2008 All you guys that are getting the P0128 code with the messed up thermostats, is ure ECT going above 170.6 degrees? Especially your's Keith, did your messed up thermostat show weird ECT readings or just had a hunch? Most of mine were cured with the new calibration and were early build trucks. The last one I had gave me the P0196 ant had a stuck t-stat, the mangled one i mentioned. I think the key to diagnosing this is to look at the freeze fame data and the runtime as mentioned. Then drive the truck to fully warm it up. Look at ECT and EOT, they should be fairly close. On the one I had with the bad t-stat the EOT was at least 25 degrees (f) higher than ECT. The EOT never got over 160 degrees before replacing the t-stat. Edited to fix the acronym imbalance. /forums/images/%%GRAEMLIN_URL%%/blush.gif Quote Link to comment Share on other sites More sharing options...
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