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P1004 - SHORT RUNNER VALVE CONTROL PERFORMANCE
P1004 is for the performance of the intake plenum's short runner valve actuator. This is an electrical actuator on the intake that opens and closes a valve in the plenum under certain driving conditions to provide better performance.
There was a service bulletin for this code and is the first thing that needs to be done. Your dealer may have already done this, or is in the process of completing it with the repair you were quoted. The TSB involves reprogramming the software in the powertrain control module and then checking to see if the short runner valve actuator works correctly. After the software is updated then the actuator is commanded to sweep using the scan tool. If it doesn't sweep correctly then the actuator is removed and the valve is moved by hand. If any binding in the valve is felt then the intake plenum has to be replaced. If no binding is felt and the wiring to the actuator is intact, then the actuator will need to be replaced.
It sounds from your description that this is what the dealer is doing. I would say that the software has been updated and they found that the short runner valve was binding, and the plenum needs to be replaced. It wouldn't cost $2,000 though. The plenum itself runs $449 and the labor to replace it shouldn't exceed two hours.
I had the same problem and was able to fix it in less than 15 minutes and for $4.99. Locate the SRV ( this is the actuator on the intake closest to the center line of the engine) and disconnect the electrical connector by sliding the red clip on the side toward the wires. You will then push down on the release tab and will be able to pull the connector off. Remove the four 10 mm hex bolts and pull the actuator straight off. There is resistance from an o-ring but it does come out. You will notice oil and crud running out just wipe this up. Spray intake manifold cleaner on the flapper valve and wiggle it to loosen the crud. This may take a couple of minutes but you will feel it free up and move effortlessly and the you are finished with the flapper. wipe the actuator off and turn the rectangular stem sticking out by hand back and forth to free it up as well. Wipe the o-ring off and put it on the actuator body and insert the actuator drive tab in the flapper valve and adjust the position that you pulled it off from. install the bolts lightly torquing them back into the (plastic!!!) housing. re-connect the plug and reset the red tab. All done. The trouble light should clear. If not you may need to replace the actuator (around $150) using the same process.
This code P1004 -Short Runner Valve Performance.
Requires PCM reprogram done under service bulletin 18-003-07REV. A, go to the dealer and have this preformed and your code should go away, should be covered as warranty.
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