I've got an 04 PSD with 51K miles and I've been having problems with hessitation and turbo flutter at crusing speeds as well as erratic idle. I have/had a BullyDog Power Hound with a Bullydog intake and 4" exhaust. I removed the power hound before taking it to the dealer and they found the P0470 code and replaced the EBP sensor?? Well that worked for about a day or so and started doing it again. I took it back to the dealer and they're getting the same error code. They said since they already replaced that part there's nothing else they can do since I have an after market intake and exhaust, and that I'd have to put it back to stock. Has anyone ever had this problem with theirs? and if so what fixed it?? Thanks..
I swear what a cop out!!!! They can't fix it and blame it on your exhaust like it really has anything to do with that sensor. I mean... i have seen odd stuff but really now...
P0470 Exhaust Pressure Sensor.
471 EPS Range Performance
472 EPS Low input
473 EPS Hi input
Check for damaged pins/ connectors or wiring. Obviously they didn't fix it if it came back. And considering that they fixed it while fumbling (FWF) for a day, it may be a bad pin/connector. Not uncommon on the 6.0!
I tried to make it a PDF for it but that computer just doesn't like me.
Additional causes: Sigrtn circuit open, bad pcm, bad EPS
You may want to post this question in the 6.0L forum (a little further down on the main forum page), or ask a moderator to move it there. We have certified 6.0L techs, as well as a bunch of guys who know these trucks better than I do that may be able to help you out.
aldredgec: I thought it was exactly that a cop out. their "tech" couldn't figure out the problem so they blame it on the exhaust. I'm sure they knew exactly what I thought about their service by the time I left that dealer.
What part would I check for bad pins/conectors?? The PCM possibly?
Beerstalker: I posted the same question there as well - thanks for the help.. this site is awesome!!
Do you know where the EPS is ? It is the sensor right next to the thermostat housing. Follow the upper radiator hose back to the engine. Check that connector there. See if it looks damaged. In all reality you need a mating pin to check the connection in each pin hole.
Also check the PCM connector behind the driver side battery. Looking at the EPS connector, the sigrtn pin is the top right with the flat side of the connector to the top.
I'm not sure which of the 3 PCM connector it is looks like a 46 pin one, but it is pin 25 of that connector. you will want to ohm between those pins, and also check to see if they are shorted to ground or another wire. It is possible the wires have chaffed somewhere and are touching another ciruit. It can be difficult to diagnose, but possible.