truck wont start

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01-25-2010, 06:20 PM
2000gmc

truck wont start

when i turn on the key forward you can here the fuel pump come on, you turn it to start and it does for a second or so, and it dies again, it did that the other day and then it started to turn on and works great but today its doing the same thing that i wont turn on, so i connected the hp tuner and pulled this codes, hp tuners tech support said they were bcm codes and not to worry about it need some help. am not really worry about the brake codes but the others i don't know were start looking. thank you

[Brake] C0236 - Rear Wheel Speed Signal Circuit Missing (History)
[Brake] C0238 - Wheel Speed Mismatch (History)
[Brake] C0226 - LF Wheel Speed Signal Missing (History)
[Unknown] U1255 - Class 2 Communication Malfunction (History) (Immature)
[Unknown] B2947 - Security System Sensor Power CKT Low (History) (Current) (Immature)
[Unknown] B2958 - Security System Sensor Data Circuit High (History) (Immature)
[Restraints] U1096 - Loss of Communications with IPC (History) (Current) (Immature)
[Restraints] U1000 - Class 2 Communication Malfunction (History) (Immature)
[Restraints] U1064 - Loss of Communications with DIM (History) (Immature)
01-25-2010, 06:27 PM
CHEVROLADE

check ecm fuse under hood/dash
01-26-2010, 03:33 PM
2000gmc

day 2 still wont start

Quote:

Originally Posted by STUNNA

check ecm fuse under hood/dash

i checked all the fuses, before this happen my security light would stay on while i drove it, could that have something to do with it.
01-26-2010, 05:33 PM
2000gmc

ignition switch

one of my buddys said it can be the ignition switch, does anyone know how to troubleshoot for a bad ignition switch.
01-26-2010, 06:23 PM
Madd Maxx

Quote:

Originally Posted by 2000gmc

when i turn on the key forward you can here the fuel pump come on, you turn it to start and it does for a second or so, and it dies again . . .

Hearing the fuel pump does not mean it's working properly. Put a pressure gauge on the fuel rail.
01-26-2010, 06:37 PM
farmtruc

Have vats turned off.
01-28-2010, 01:36 PM
2000gmc

vats turned off

Quote:

Originally Posted by farmtruc

Have vats turned off.

what do you mean if i have vats turned off.
01-28-2010, 01:38 PM
2000gmc

fuel pressure

[QUOTE=Madd Maxx;346467]Hearing the fuel pump does not mean it's working properly. Put a pressure gauge on the fuel rail.[/QUOTE

yes i have fuel pressure stock fuel pump plus msd booster pump.
01-28-2010, 02:15 PM
Chevy366

Quote:

Originally Posted by 2000gmc

what do you mean if i have vats turned off.

V.A.T.S. , vehicle anti-theft system , is it turned off in the tune ?
01-28-2010, 03:11 PM
2000gmc

Quote:

Originally Posted by Chevy366

V.A.T.S. , vehicle anti-theft system , is it turned off in the tune ?

no i think it says serial. on the space.if i put it on none will it turn it off.
01-28-2010, 09:26 PM
GasGuzzler

Quote:

Originally Posted by Chevy366

V.A.T.S. , vehicle anti-theft system , is it turned off in the tune ?

:wave:
02-03-2010, 06:57 PM
2000gmc

troubleshooting

so i checked the fuel pressure and it is between 50psi and 60psi, checked sparked and there is spark on both banks, checked every fuse and none of the are blow. what else can it be, is there anyway to troubleshoot a bad pcm.
02-03-2010, 07:39 PM
farmtruc

Did you do the old screwdriver in the plug wire testing spark on the manifold?

are the injectors firing?

like they said, maybe vats?
do the security relearn and see if that helps. if not, have your turner turn off vats in the pcm, if that ain't it, maybe the first thing you should try, get a test pcm.
02-03-2010, 07:57 PM
RedHeartbeat

Bad crank or cam sensor or broken wire in either one of them. Ohm out the wire from connector to PCM and check for a good circuit. Swap them with known good sensors.

Also, try a test noid light on the fuel injectors to see if they're firing.
02-03-2010, 08:20 PM
2000gmc

Quote:

Originally Posted by farmtruc

Did you do the old screwdriver in the plug wire testing spark on the manifold?

are the injectors firing?

like they said, maybe vats?
do the security relearn and see if that helps. if not, have your turner turn off vats in the pcm, if that ain't it, maybe the first thing you should try, get a test pcm.

how do you do the security relearn, i think am gonna pass by the junk hard to pick up a pcm, because I cant turn off the vats, really i cant change anything on pcm with my hp tuner. so hptechsupport said that my pcm lost its vcm id #, so it can only be retune if i have the year/model license, which i dont have, i did the single license. NOW that i think about it all this started when the trucks security light came on, and then i couldent do any changes to the file. thanks for the help.:hyper2:
02-03-2010, 08:31 PM
RedHeartbeat

did you try a download complete operation from the PCM to the laptop?
02-03-2010, 09:42 PM
2000gmc

Quote:

Originally Posted by RedHeartbeat

did you try a download complete operation from the PCM to the laptop?

not sure what you mean, i tried reading the pcm and it does but it wont give me the option to license, since i dont have enougth credits for the year/model license. sorry man, still kind of new at this tuning. :thanks:
02-03-2010, 09:49 PM
RedHeartbeat

you should have got 8 credits when you bought HPTuners and your PCM only should require 2 to license the PCM. You should be able to download the tune from the PCM and view it in the editor if you don't have any credits available. Where are your 8 credits?
02-04-2010, 10:43 AM
2000gmc

Quote:

Originally Posted by farmtruc

Did you do the old screwdriver in the plug wire testing spark on the manifold?

are the injectors firing?

like they said, maybe vats?
do the security relearn and see if that helps. if not, have your turner turn off vats in the pcm, if that ain't it, maybe the first thing you should try, get a test pcm.

No I bought a tester, and am assuming the injectors are working, because the truck turns. For a bit, like if it had a kill switch.
02-04-2010, 10:48 AM
2000gmc

Quote:

Originally Posted by RedHeartbeat

you should have got 8 credits when you bought HPTuners and your PCM only should require 2 to license the PCM. You should be able to download the tune from the PCM and view it in the editor if you don't have any credits available. Where are your 8 credits?

I have two credits left, since I used 2 on the truck, 2 on my brothers truck, and 2 on the gto. But I can't do a single license on my truck again because it says that their is no vcm id.
02-04-2010, 11:08 AM
RedHeartbeat

I wonder if NP or a local tuner that has the ability to load a GM factory tune into the PCM can rewrite it? In order to keep from having to buy another license it has to be put back in the PCM you have. Would be nice if you could get a GM tech to do that for you with their hardware.
02-04-2010, 03:08 PM
2000gmc

Quote:

Originally Posted by RedHeartbeat

you should have got 8 credits when you bought HPTuners and your PCM only should require 2 to license the PCM. You should be able to download the tune from the PCM and view it in the editor if you don't have any credits available. Where are your 8 credits?

I have two credits left, since I used 2 on the truck, 2 on my brothers truck, and 2 on the gto. But I can't do a single license on my truck again because it says that their is no vcm id.
02-04-2010, 09:23 PM
05silver

do a 30 min. learn

bump the starter (with the key) and leave the key in the on postion, after 10 min the security light will turn off for 10sec...do this 2 more times. when youve done it 3 times the security has been re-learned you should be able to start it. be sure to watch the clock though

i just saw your in houston, what part?
02-04-2010, 10:48 PM
farmtruc

We can flash it with GM's latest cal.
Send it over if you want.
02-05-2010, 06:34 AM
2000gmc

Quote:

Originally Posted by 05silver

do a 30 min. learn

bump the starter (with the key) and leave the key in the on postion, after 10 min the security light will turn off for 10sec...do this 2 more times. when youve done it 3 times the security has been re-learned you should be able to start it. be sure to watch the clock though

i just saw your in houston, what part?

Thanks for the info,ill try it today. I stay off of hobby airport.
02-05-2010, 06:41 AM
2000gmc

Quote:

Originally Posted by farmtruc

We can flash it with GM's latest cal.
Send it over if you want.

I appreciate the offer,but according to hp tuners tech he said that their is no way to put a vcm id back on the computer. Am gonna try to relearn the pcm. And hope it turns on.
02-05-2010, 09:40 AM
05silver

Quote:

Originally Posted by 2000gmc

Thanks for the info,ill try it today. I stay off of hobby airport.

i stay in pearland if you need help with it, i can stop by one day after work next week
02-15-2010, 07:50 PM
2000gmc

pcm problem

Quote:

Originally Posted by farmtruc

We can flash it with GM's latest cal.
Send it over if you want.

if you flash it will it give it a new vcm id #
02-15-2010, 08:00 PM
2000gmc

question, am trying to do the security relearn, but the security light stays on for a few seconds and then it turns off, then the battery light comes on for a few seconds, and so on, it keeps doing that security,battery,security,battery.etc this is annoying
02-18-2010, 04:02 PM
txarkitekt

Hmmm...hearing that makes me think that you have an 01-02 PCM in your 2000 truck and the OS is not matched up correctly. Is the PCM your OEM one? Or is it a different one?

I would try the Relearn, and not worry about the battery light. Just imagine its not there. After bumping the key...wait ten minutes and watch the light to see if the Security light goes away and the battery light is the only one left... At that point, start the 2nd part of the relearn, etc. It should start.

If it was me, I would save the file, take the PCM to the dealer and have the PCM wiped completely clean. Then make them reflash the stock 2000 OS and tune file onto the PCM. Once the PCM is back in the truck, compare the tuned file to the stock file and make the changes. DO NOT copy and paste--cause you DO NOT want the other OS back on it when you write the calibration.
02-19-2010, 06:23 AM
2000gmc

Quote:

Originally Posted by txarkitekt

Hmmm...hearing that makes me think that you have an 01-02 PCM in your 2000 truck and the OS is not matched up correctly. Is the PCM your OEM one? Or is it a different one?

I would try the Relearn, and not worry about the battery light. Just imagine its not there. After bumping the key...wait ten minutes and watch the light to see if the Security light goes away and the battery light is the only one left... At that point, start the 2nd part of the relearn, etc. It should start.

If it was me, I would save the file, take the PCM to the dealer and have the PCM wiped completely clean. Then make them reflash the stock 2000 OS and tune file onto the PCM. Once the PCM is back in the truck, compare the tuned file to the stock file and make the changes. DO NOT copy and paste--cause you DO NOT want the other OS back on it when you write the calibration.

Its The stock pcm