Yep thats to do with the fuel pump. The fact that it is just "sometimes" can be due to the connection harness not making a tight connection, so sometimes it is fine, sometimes not. A variety of reasons it could come and go. Yep 2 years ago or so you may have got a loaner (at dealers expense and courtesy) but with no cars. far less income for dealers, etc., etc. it is pretty much the norm now not to get a loaner.Thats all new by me, last time I had my car in at the dealer probably 2 years ago I got a loaner. They didnt do anything with it because I ended up taking it as I didnt want to spend possiably $120 waiting on them to get to it after scheduling the appointment for today. The code was P129F, it might explain the noise I am getting from what sounds like from the rear. as its some sort of fuel pump thing. I would think it would stay on though. Irratating is all I can say. I would have been ok taking the shuttle if they would have gotten to it today. but he wasnt telling me that was going to happen. Will see if I get the light again anytime soon and go from there I guess.
Here is some more info about your error code:
The Fuel Pump Driver Control Module sends reports of the actual fuel pump speed to the Engine Control Module (ECM) as serial data every 10 ms. The ECM calculates the error between the commanded fuel pump speed and the fuel pump speed that was reported from the Fuel Pump Driver Control Module. A Diagnostic Trouble Code (DTC) will be set If the fuel pump speed is outside a calibrated threshold. The DTC will be set if the difference between the commanded fuel pump speed and actual fuel pump speed is outside a the calibrated range for greater than 7 s.
|P129F code possible causes Faulty Fuel Pump and Level Sensor Assembly Fuel Pump and Level Sensor Assembly harness is open or shorted Fuel Pump and Level Sensor Assembly circuit poor electrical connection Faulty Fuel Pump Driver Control Module
Read more: P129f Code - Fuel Pump Driver Control Module Fuel Pump Speed Signal Incorrect