Hi there. I recently got a 2006 Lexus GS300 and within a week, the vsc and check engine light came on. I looked through the forums and found that a crappy gas cap could be the culprit so I changed that and still no dice. Using an OBD reader, it threw up a code:

P2004 Intake manifold runner control stuck open bank 1

i have no idea what that could mean so I took it to my mechanic to diagnose. After a few hours he said he couldn’t figure out what the code was and told me it could be a hard code that has to do with the computer. Has anyone had any issue with this particular code before?

 

Here's a video that talks about repairing the intake manifold runner control:


Not sure I'd go back to a mechanic that wasn't able to diagnose this. Might be worth asking a prospective mechanic if they have access to Identifix or a similar service, since independent shops can't possibly know all there is to know about every make and model.

 

Yeah, I'll probably be looking for a mechanic that specializes in Lexus here. Thanks for the video!

 

Odd your mechanic couldnt figure it out, seems like an easy diagnosis. These only 2006 GS300's cars are prone to carbon build up, im wondering if a bit of carbon has wedged and froze the butterflys. As this is the first time im seeing this issue.

Its not difficult to remove the top intake manifold, from there you should be able to see the butterflys. Then you can have someone cycle the key ignition but not start the vehicle. Should be able to see the butterfly's open and close as a pre-start. That should tell you what is going on, if there stuck, if something binding them up, or if they are not working all together.