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Help! P0449 Vent Solonoid Control Curcuit

FixaFro420

By FixaFro420
in Ask A GM Technician

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FixaFro420 Enthusiast

FixaFro420

Posted
Posted

2003 GMC 2500HD 6.0l I took it to the dealer after a $89 fee they tell me P0449 (Vent Solonoid Control Curcuit). So I buy it $174.70 a new designed valve # 19152345. So I put it in, what a pain. Bring it back in the morning to clear engine light. 30 min later it comes back on. I bring it back the scan it P0449 same thing. Now I wasted $263.70 for no reason GREAT. They want another $89 to diagnose it again HELL NO. The tech told me to check the plug, it's fine. He also said that the scan tool is not getting signal from the valve. So I checked for Power & Ground with a test light, nothing. Now what, Dealer don't care. Please Help

 

 

"COLONIAL SOUTH CHEVEROLET" SUCKS!!!

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted
Which one don't you have, power or ground.

 

 

I checked for power and ground and didn't get anything on my test light and i know it works

 

 

 

you have everyright to go to the service manager or the dealer principle ,this is a COMEBACK,you have already paid for the diag ,now it is their turn to pay,they did not fix it,take it back.

fixitmann Enthusiast

fixitmann

Posted
Posted

No power to solenoid could be simple as 4ws fuse. But I wouldn't lift a finger to replace it.You laid down your money for a correct diagnosis and it appears that is not what happened here

minibike132 Senior Enthusiast

minibike132

Posted
Posted

They are both right. You can go up the chain to get it diagnosed correctly for free (that doesn't mean the fix will be free just the diagnosis). I was going to help on the assumptioun you just want to get it done. If you have the time you should make them diagnose it correctly. Sometimes you need to fix one thing to find another. That is not the case here. They could not have diagnosed the valve as bad without checking for power and ground. If the diagnosis was the other way you wouldn't really have a case. If they said you have a broken wire because you have no power at the valve then fixed the power and the valve still didn't work then their diagnosis would not have been bad. The way it looks they charged you $87 to guess.

 

If you just don't want to deal with them thats where I'll help. No power check the 4ws fuse in the underhood fuseblock. The ground is PCM controlled you will not always have that, you need a computer to tell the pcm to activate the ground. There is no connectors between the 4ws fuse and the valve just a wire so if the fuse is good and you have no power you have an open wire somewhere which can be hard to find.

 

Good luck and keep us posted whichever route you decid to go.

FixaFro420 Enthusiast

FixaFro420

Posted
  • Author
Posted

Checked the 4ws fuse and it also has no power and the fuse is good. could this be a problem with the computer? Also once in a while the engine light would go off for a few hours but in the morning it will come back on. please help

minibike132 Senior Enthusiast

minibike132

Posted
Posted
Checked the 4ws fuse and it also has no power and the fuse is good. could this be a problem with the computer? Also once in a while the engine light would go off for a few hours but in the morning it will come back on. please help

 

The pcm controlls the ground side of this circuit, the pcm cannot be the reason you have no power at the fuse. That may not be good news unfortunately. There are about 30 things on the bus that powers your 4ws fuse. What I mean is there is battery power to a long strand of things in the underhood electrical center. There are several busses or strands. Some of the things on the bus that powers the 4ws are radio,abs,hvac... if everything else works and you have no power to the fuse it sounds like you need the underhood electrical center which is probably more expensive than the pcm. Make sure you really do not have power to that fuse.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted
i checked the fuse with a test light and i also checked for power with the fuse out. nothing. and the test light works. could i just give the fuse power? LOL

 

 

I took a look at the power supply to the 4ws fuse ,and it is hot at all times,I guess you could but have to lift the fuse block anyways ,so go ahead and remove the bracket and cover of the fuse block,then unlatch the fuse block and turn it upside down or at least on its side ,find the fuse feed ,maybe a mouse got in there,go from there,thats what I would do.you'll find something as mike said ,lots of other things on that bus,6 things actually,take your time,on the right track now.

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