most common problem is the ( Transmission Control Solenoid ) . it controls the way the transmission shifts by controlling the amount of vacuum. when it malfunctions it shifts either very hard or seems to slip between shifts. also you will feel a pulsing sometimes when at or around 35 mph on flat ground. problem seems more pronounced after engine is completely warmed up. the part it's self is only about 26.00 dollars , not sure what they charge for labor as i replaced it myself. seemed to cure the problem.
The best place to go is www.mygmlink.com, where you can register your van and then get a PDF copy of the owner's manual. Take Care also check out this site http://www.ownersmanualsource.com/chevrolet/chevrolet-venture-owners-manuals/
If the check engine light is blinking that means an engine cylinder misfire has been detected
It requires a scanner to properly diagnosis a check engine light.
Do you need to check two possibilites, one, check if the oil is from transmission or from the engine, if the oil is red,is from transmission and you need to replace radiator, if the oil if from the engine you got it a big problem, because the only way that the engine oil is inside the radiator is because the engine has a bad head gasket, that mean you need to repair the engine heads.
Check under vehicle - follow fuel line from tank
With a scan tool.
VSV is a solenoid. Check at your Chevrolet or Isuesyou dealership.
Bill Greene
There are many sensors that can trip the check engine light to come on.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Have vehicle scanned to determine the problem
At 100,000 miles change the spark plugs. Check the air filter and PCV valve. You're done.