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A couple different codes..B0100 and P0128
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MarineGrunt
Enthusiast
Aug 8, 2013, 5:19 PM
Post #1 of 41
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A couple different codes..B0100 and P0128
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2003 GMC Sierra 4X4 4.8L 91K
First off I got the P0128 and scanner says "Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature). I replaced the thermostat a few days ago and cleared the code. I did notice that the engine temp only registered around 175 or so after that. The CEL came back on today and got the above code. I had the same issue with the Envoy even after replacing 2 thermostats. I ended up having to use an OEM thermostat and that took care of the problem. What are the chances this could also need OEM? My scanner does read some live data so do I need to see what the scanner says for engine temp in order to rule out the temp sender?
The airbag light also came on today. I got the code B0100 Scanner says "Electronic Front End Sensor 1 Performance". When I purchased the truck last August and it had the airbag light on. It ended up being the front passenger sensor and it was replaced. Any idea what sensor is faulty or will I have to take the truck to the dealership?
Thanks for any help.
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Hammer Time
Ultimate Carjunky
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Aug 8, 2013, 5:47 PM
Post #2 of 41
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Re: A couple different codes..B0100 and P0128
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It sounds like you answered your own question on the P0128. The Airbag code means the control module is not communicating with the front end sensor, probably a bad sensor but could be wiring too.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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MarineGrunt
Enthusiast
Aug 8, 2013, 7:19 PM
Post #3 of 41
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Re: A couple different codes..B0100 and P0128
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I've never had to deal with a temp sender on any vehicle so I figured I'd double check with you. If I never would've joined this forum I wouldn't have had any idea of what to do after the thermostat didn't fix the problem. It's amazing how much you guys have taught me about problems I've yet to encounter on my own vehicles and it's just from browsing through different threads. Seems like I learn something new everyday. I'm going to have to start giving you guys my GI Bill!
Have you had any experience with the Dorman sensors? I can get one on ebay for around $50 versus over $200 for the OEM. Like I mentioned when I first posted, the passenger side was replaced last August. I just let the dealer do that one since I already had them looking into that clunking/chirping problem I had with the slip yoke. Think I should just pay the $45 to have them tell me what sensor it is or what the problem is? I'm kind of thinking since the passenger side has been replaced it's more than likely the driver's side. Awhile back I left my window down and got a bunch of rain on the floorboard. That triggered the airbag light too but it brought up a different code so that kind of had me thinking it's possibly a sensor. I have no clue though. I hate gambling on parts but since the part costs the same as the diagnosis, and it's likely the cause, I may just give it a try first. If it's not it I could always throw it back on ebay and probably get most of my money back.
What would you do if you were in my shoes?
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Hammer Time
Ultimate Carjunky
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Aug 9, 2013, 2:47 AM
Post #4 of 41
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Re: A couple different codes..B0100 and P0128
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$200 for a temp sensor? What is it..........solid gold?
OK, I re-read your post and I assume you referred to the crash sensor for that price.
You can easily check the temp sensor with the scan tool by just looking before starting the vehicle in the morning and compare the reading of the IAT and the ECT and they should match.
As for the crash sensor, I've really never dealt with any failure there which make me surprised you had 2. That makes me wonder what this truck has been through to need two of them.
I use a lot of Dorman stuff and although it is definitely lower quality than OEM, it's usually good enough. I don't know about this situation though. A crash sensor is a different story.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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MarineGrunt
Enthusiast
Aug 9, 2013, 4:17 AM
Post #5 of 41
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Re: A couple different codes..B0100 and P0128
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I'll check the reading of the IAT and ECT and see if they match. Thanks for that info. I had no idea about that.
Crash sensor is $200 for OEM. $50 for Dorman.
I know the truck was originally from Wisconsin so maybe it was due from all the salt they use on the road. Just a thought though. It doesn't seem like the truck has been through anything crazy such as a flood. It has the normal rocker panel rust but nothing crazy. (I'm actually in the process of welding new on now. Passenger side is almost done.) I've had the carpet pulled up and no rust there. I've also had a handful of wiring harness unhooked and no corrosion or anything. The truck has a little bit of rust on the a-arms and some on the frame but nothing crazy. It has a clean title but I know that always doesn't mean anything.
I'm getting ready to leave to take my daughter up to Six Flags Great America in Chicago so I'll be sure to hook the scanner up in order to check the IAT and ECT. I think I'll also go ahead and roll the dice on the Dorman crash sensor. If that doesn't take care of it I'll probably have the dealer diagnose it and fix it on my own if I can.
I'll post back once I find anything out.
Thanks HT.
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MarineGrunt
Enthusiast
Aug 9, 2013, 4:49 AM
Post #6 of 41
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Re: A couple different codes..B0100 and P0128
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At startup the IAT and EXT were 20° off. Does that mean temp sensor is bad?
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Hammer Time
Ultimate Carjunky
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Aug 9, 2013, 5:11 AM
Post #7 of 41
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Re: A couple different codes..B0100 and P0128
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It means one of them is, probably the CTS since you have a P0128
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Aug 9, 2013, 5:41 AM
Post #8 of 41
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Re: A couple different codes..B0100 and P0128
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MG - all. About parts by brand names:
Dorman at least once was a good name. What you don't know is if the item, whatever it is has just bought into the brand name or is still exactly what it was. In short the name and box gets sold out many times so hard to be brand loyal.
Enter stage left - then there's hacking things, essentially stealing the brand name. Doesn't seem to matter, automotive, household items or what. You really aren't going to know till it's in your hands and tested out.
This goes right down to a box of nails or household light bulbs. Dog-e-dog out there!
T
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MarineGrunt
Enthusiast
Aug 9, 2013, 5:50 AM
Post #9 of 41
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Re: A couple different codes..B0100 and P0128
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Is there a way to test the cts?
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Hammer Time
Ultimate Carjunky
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Aug 9, 2013, 6:17 AM
Post #10 of 41
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Re: A couple different codes..B0100 and P0128
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You're already done the most reliable test. You can do a resistance test working off a chart but the accuracy leaves a lot to be desired. It should be a $25 sensor. I'd just replace it and do the comparison again.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Aug 9, 2013, 7:07 AM
Post #11 of 41
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Re: A couple different codes..B0100 and P0128
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MG - if you have enough troubles it can be tested as HT said to verify it. If you don't have something yet for instant temp sensing I endorse and own this widget from Radio Shack. Small and accurate - not expensive and a wide temp range.
I've done the battle - shop to a kitchen for heat(stove/oven) or cold of freezer crap.
Small can be a good thing sometimes as it is so portable. It's exactly 4" long. This thing......
If that pic doesn't show I'm going to have a fit!
T
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MarineGrunt
Enthusiast
Aug 9, 2013, 10:53 PM
Post #12 of 41
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Re: A couple different codes..B0100 and P0128
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Thanks guys.....
Just rolled in the drive from the trip to Great America in Chicago. Man am I beat. We were waiting in line before they opened and closed it down. My body can't take those rides like I use to. I still love em though! My 10 year old daughter is fearless on all of those coasters.
I ordered the crash sensor off of ebay today. It was right around $52 shipped. I think it'll be here by Wednesday. I plan on picking up the cts tomorrow. I'll let you know if it takes care of it.
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Double J
Veteran
/ Moderator
Aug 10, 2013, 1:58 AM
Post #13 of 41
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Re: A couple different codes..B0100 and P0128
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MG, Just curious,how long does it take you to drive up there?
Guessing you're about 3 hours one way?
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MarineGrunt
Enthusiast
Aug 10, 2013, 6:10 AM
Post #14 of 41
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Re: A couple different codes..B0100 and P0128
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I live in Metamora and it's right around a 3 hour drive to Gurnee. It's about 170 miles. Chicago is about a 140 mile drive. Being from down here I'm not use to tolls. I blew through one on the way. On the way home I had money ready and was making sure to pay attention. Of course, right when the toll was coming up my daughter started flapping her jaws. I ended up driving through an I-pass lane so had to skip that one too. They say you're allowed two "skips' every 24 months. Last year when we bought the Envoy I accidently blew through two of them. I was in my truck this time so I think I'm good since I can blame it on my wife. I guess I could just get online and pay the $1.40 and $1.90. Problem is I don't know what toll stations I went through. I hate how it branches off to like 300 lanes and you have to make sure you're in the right one. If you're paying attention 1/2 mile before it's no big deal. But, when you have a 10 year old girl talking your ear off it's an easy thing to miss!
When I use to go to more Bear's games about 8 years ago I would always take an exit around Cicero to swing by a meat locker. I believe it was owned by either a Polish or a Czech family. Seems like every worker was either Polish or Czech and had about 10-15 people working behind the counter. Most were young females probably in there 20's. They all had an accent. This place had glass displays full of meat probably 100' long! Well, maybe not quite but it was huge. It also had a lot of grocery items. It was a decent sized place. Seems like I remember them having a few hundred different kinds of sausages hanging behind the counter. I'd always stock up on these sausage breakfast links. They were about 6" long and about as big around as a handle of a screwdriver. That place was awesome. I can't remember its exact location but do remember a big red sign that said "Meat" or "Meat Market". I wish time would've allowed for us to stop by there yesterday.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 10, 2013, 6:36 AM
Post #16 of 41
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Re: A couple different codes..B0100 and P0128
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Tolls: Blew thru one myself that did the same thing. Just changed such that you get to a point of no chance to move over to where you can just pay. Now you don't even slow down or see anything - no booths no people no chance.
Was told they take pics of all traffic and registered owner will get the bill in the mail. Here and I think all East coast now takes the same transponder called EZ-Pass. Don't want one more thing to move car to car but may get one,
Tom
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Tom Greenleaf
Ultimate Carjunky
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Aug 10, 2013, 7:22 AM
Post #18 of 41
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Re: A couple different codes..B0100 and P0128
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Something told me you wouldn't leave that alone - Oh my,
Tom
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Discretesignals
Ultimate Carjunky
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Aug 10, 2013, 9:27 AM
Post #20 of 41
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Re: A couple different codes..B0100 and P0128
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I'm I really that predictable?
I'm getting ready to head off to Sam's Club. I am a big fish eater and they have these stuffed salmon fillets that are awesome. For around $10 you get six of them. Pop them in the oven for 20 mins and you think you died and went to Heaven.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 10, 2013, 5:11 PM
Post #22 of 41
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Re: A couple different codes..B0100 and P0128
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Whole thread too funny MG. We (you) started with codes and look where we went. YOU DO NOT WANT LOBSTER FROM SOUTH OF CAPE COD MA - Trust me.
#1 in the whole world is Rockland, ME. Check this joint out, been there several times.
http://www.jessmarket.com/ (we don't allow links - too bad) they don't sell car parts.
OK - This place ships worldwide, live next day if you wish same day catch but they live a fair while just stuffed in seaweed.
If you want to blow some bucks this is the place. If you are really into it plain call them and ask for female lobsters! They have the red egg caviar (roe{sp?}) and duh the males don't - here we go again
Really mess with people's heads and ask for left handed ones and there are very few.
Definately get the 2lb ones...............
Tom
(This post was edited by Tom Greenleaf on Aug 10, 2013, 5:13 PM)
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MarineGrunt
Enthusiast
Aug 12, 2013, 10:12 AM
Post #23 of 41
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Re: A couple different codes..B0100 and P0128
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I'll trade Tom for some lobster and DS for some Mahi Mahi then.
I got my crash sensor in the mail today so going to toss it on. I didn't get around to the cts this weekend but, today for the first time, the temp gauge is registering where it should. Kind of odd but I guess electrical components will do that at times. I'll probably pick up the cts this evening and install it tomorrow.
Hey HT....how does comparing the reading of the IAT and the ECT tell you it could be the cts? I'm just curious as to why so next time it happens I have a better understanding of it.
(This post was edited by MarineGrunt on Aug 12, 2013, 10:14 AM)
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Hammer Time
Ultimate Carjunky
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Aug 12, 2013, 11:14 AM
Post #24 of 41
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Re: A couple different codes..B0100 and P0128
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It doesn't tell you which one, only that one of them is wrong. The P0128 and new thermostat is what tell us it's the CTS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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MarineGrunt
Enthusiast
Aug 12, 2013, 11:49 AM
Post #25 of 41
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Re: A couple different codes..B0100 and P0128
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Oh okay...I got ya. When you had me check the ECT and IAT on the scanner I didn't even really think about what I was checking or what the abbreviations even meant. I just knew that if HT said to check them I better do it!  When it comes to diagnostics I have a looong way to go.
I replaced the driver's side crash sensor sense the passenger side had already been replaced. When I started it up no airbag light came on or no "service airbag" flashed across the dic so that took care of that problem.
This is probably a stupid question but I remember reading this somewhere. I have never heard of this any other time and wouldn't think it would be correct but figured I'd ask. Do certain thermostats have to self adjust? Since my temp gauge is now reading where it should and everything seems to be working it made me think of when I read that. I don't see how a mechanical thermostat could self adjust though. You know me though. I don't trust anything until I ask it here.
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