my 08 is350 is getting $7e8 0r p0390 code I was driving down the highway when my car begin to lose power and start to slow down i pulled over to the gas station once i stopped it shut off i gave it a minute then started it back up when i put it into gear it shut off again so i managed to drive it slow home not over 40 got the codes tested came back P0390 camshaft position sensor b bank 2 i changed my oil and spark plugs to make sure it was not just a tune up issue and nothing i changed my crankshaft sensor down by the ac compresssor and now my car will crank but not turn over but is still reading the same code can anyone help please?

 

Worth a shot, remove the battery terminal and after a few minutes hook it up and start it up and see if the CEL disappears. Like re-booting the computer. Good luck. Did you say you already replaced the crankshaft sensor?

 

Why did you replace the crank sensor when P0390 indicates Bank 2 Exhaust cam sensor?

I'd start by inspecting the wires to the black sensor in the middle of the valve cover. Bank 2 is the left when sitting in the drivers seat.

 

thanks bro I tried that it did the same thing and yes changed the crankshaft sensor

 

it was listed as one of the main possible causes but when sitting in the drivers seat do you mean the sensor that is under the carpet in bank 2 or the sensor wire under the hood i cant find a good diagram to find exactly where it is actually got it to start but it has a loud rocking noise when i accelerate past 3000 rpms then stops once let the gas pedal go

 

 

^^ Thanks Mike!

You're looking for this black 2 wire sensor but the one on the left side. Bank 2 with cylinders 2, 4, and 6.

 

I'm not sure where you read that. These cars have no history of the crank shaft sensor failing. Like the MAF, the sensor is critical input and most any failure results in an undriveable car. i.e. not even limp mode is available.

I suspect a wiring problem more than sensor problem as the sensors are pretty bullet proof.

 

What was the last repair/maintenance job performed on the engine BEFORE this all started? I would start in that area looking for a wiring issue.

Good luck!

 

Hi, did you sort out your problem ?