DTC Err 42 (Problem Found)

Trapper

New member
Re: DTC Err 42

Re: DTC Err 42

Rookie I had recently a code 42 and I had a lose battery terminal and it hasn't come back since, Man you have a good running truck if thats all thats wrong for now.
 

WyoSyclone

Active member
Re: DTC Err 42

Re: DTC Err 42

Guys it's not really at 25 PSI. Bitten by the "BARO Bug", at 57 KPA instead of ~95 like normal. See this post: http://www.syty.net/forums/showpost.php?p=616297&postcount=30

Yup, I remember your entry on this thread Josh...... http://www.syty.net/forums/showthread.php?t=61678 .... and thought that may be the case here.... didn't notice that low baro on first glance. I'll be anxious to see what mine reads now that I've gone from 900ft el. to 4000ft!
 
Re: DTC Err 42

Re: DTC Err 42

Rookie I had recently a code 42 and I had a lose battery terminal and it hasn't come back since, Man you have a good running truck if thats all thats wrong for now.

Yes I should definetly check that when I get home. If that was the case you would think it would start hard or something.
 
Re: DTC Err 42

Re: DTC Err 42

Battery cables are all snug. When I was taking the timing control module out from under the distributor cap I found it loose and there was no dielectric grease. If that module is not seated properly and greased up it can cause the module to go bad. I picked up another module today for $50. Normally I guess its $180. I got connections at the parts store so I got it cheaper.
I put the new module in but I have not hooked the plug wires back up. I lost the sheet for the plug wire orientation. I will find it again and try it out tomorrow.
 

WyoSyclone

Active member
Re: DTC Err 42

Re: DTC Err 42

I lost the sheet for the plug wire orientation. I will find it again and try it out tomorrow.

If the distributor is stuffed as per factory, #6 lines up with the flange for the EGR... go clockwise around the cap - 6, 5, 4, 3, 2, 1
 

i8av8

Donating Member
Re: DTC Err 42

Re: DTC Err 42

"I really think its capable of 12.0"
... especially since you fixed your brake problem!

i had a code 42 and replaced my ignition module (under the dizzy) and problem solved.

also had very bad idle>then eventually just wouldn't start anymore.
 
Re: DTC Err 42

Re: DTC Err 42

"I really think its capable of 12.0"
... especially since you fixed your brake problem!

i had a code 42 and replaced my ignition module (under the dizzy) and problem solved.

also had very bad idle>then eventually just wouldn't start anymore.

Oh and I found a huge air pocket in my intercooler system. I filled it the other day and didnt realize it was hardly even circulating coolant. I purged the intercooler last night and its circulating like it should. Its going to be interesting now that gremblins are getting worked out (again).
 
Re: DTC Err 42

Re: DTC Err 42

Last night I found a plug wire that would not seat. Its like the connector was broken or something. I got some Duralast plug wires Im puting on tonight. Does Duralast suck?
 
Re: DTC Err 42

Re: DTC Err 42

New wires and new module did not fix it. I pulled the ECM and pulled the chip. I reseated everything and its running smoother than I have ever seen it. It still has a small jump when Im driving it. Its like I have a bad ground somewhere. Im also wondering If some of my wiring on the ECM is bad. I have a brown wire that looks like it got crimped really hard. The big probelm is fixed but I still have a small bug.
Anyone know where and what grounds I should be checking?
 
Re: DTC Err 42

Re: DTC Err 42

The TPS sensor fixed the random shorting out problem. I just hit me all of a sudden when my RPM gauge turned all the way clockwise and stuck there. FIXED unitl something else breaks.
 

bezerk

New member
Re: DTC Err 42 (FIXED)

Re: DTC Err 42 (FIXED)

electric gremlins can be a nightmare. it can also be your plug wires if your tach starts bounching. or your pulgs if you spraying alky and the sparks blows out.
 
DTC Err 42

DTC Err 42

Nooooo....! Why!? I drove the truck to work again today and it started acting up again. Man this is frustrating :rant: I went through all my grounds and even put anti seize on them. My turn signals in the back still dont work. I checked the grounds that I could see in the back, Maybe if I find that problem it will lead my to my other problems. Its so random. It seems to be worse at idle than anything.
 
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Re: DTC Err 42 (NOT FIXED!!!!!!!!!)

Re: DTC Err 42 (NOT FIXED!!!!!!!!!)

I found this today making my idol change as I flexed it. Its a brown with black stripe wire coming from the ECM. Its the timing wire right? I cut the bad part out and added in a wire with crimp connectors. Seems to help my idol now. Its nice and low.
untitled-1.jpg

It did not fix my momentary glitch in the ECM. Im starting to think its the Ultimate chip in the T3 setting. It does not seem to skip a beat in the T2 setting. Is that common or possible?

I measured my block to chassis ground and it was at 64 ohms. I added another ground wire from the block to the chassis and I got that measurement down to 14 ohms. That did not seem to make a difference in anything but it cant hurt. I might have picked up 1 volt more on my ECM voltage reading on datamaster.

Im wastegate is not letting me boost again. Its the puck. It gets stuck and I have to shoot compressed air into it to get it loosened up again. Should I try and put some oil or something in it so it wont get stuck?

Any thoughts?
 
Re: DTC Err 42 (Problem Found)

The problem is T322 and T324 programs on my unltimate chip are bad. They must have missed something when they burned those two programs.
 

abes_sy

SY #2995
Re: DTC Err 42 (Problem Found)

I know its been awhile since you had this issue but when you were having it did the fault come on immediately after running it or was it after a while of driving around? just curious. My truck just started doing this and it happens after about 15min or so of driving once everything is really heat soaked.
Have you had any more of these issues since you figured out it was those two programs?
 

berzerker

wookie
Re: DTC Err 42 (Problem Found)

my guess is wrong knock sensor .the only knock sensor if had luck with is a proper gm replacement . i tried the kr6 replacemnt from advanced auto and a major problem just like your describing .
 
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