Pontiac Repair: Pontiac Montana 2006, cold climate areas, pontiac montana

Question
I bought my Pontiac Montana last year, 2012, in Feb. The day after I bought the van the check engine light came on. The codes that pulled up were p0455 and p0449. The dealrship smoked out the lines to try to find the large leak, but there was no leak detected. The dealership took the van in on several different attempts to try to diagnose it but failed. Basically they just gave up because they couldn't find anything wrong with it, other than the check engine light was on. It will not pass emissions now a year later. I was informed through another diagnostic test that the van needs a "body wiring harness." Supposedly the wires were all corroded and they say this is the cause of the codes pulling up. Can you please help?

Answer
Hi brianna:

Yes on those vans they had wire harness issues. the 449/455 are codes still in there I asuume nothing new? usually the issue is where the wire harness passes from inside the van to outside of the van at the floor behind the drivers seat. if there is a water leak in the van the water pools around that harness and corrodes it. If you live in the cold climate areas just the melting snow that gets tracked into the van can cause this as well. "usually" the body side of the harness (inside the van) can be repaired with out replacing it. the harness under the van going to the gas tank I almost always replace It's cheap enough of a part so I just replace it instead of repairing it. good luck :-)