Join Date: May 2011
Location: Frederick MD.
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Hmm, well the first 3 all have to do with high pressure oil pressure oil issues. Was anything done to the truck recently?
Not to insult your intelligence but the oil level is good? If these truck get about a gallon low they will start to show up as high pressure oil issues.
I'm sure it's probably not that simple though. Sounds like you have an IPR or pump issue. Usually these high pressure oil pumps are pretty tough. It's more likely an IPR issue. The IPR is located in the high pressure oil pump, on the drivers side, beneath the fuel filter housing. It has a 2 wire connector going to it. Make sure this connector is plugged in good. Also make sure the wires haven't rubbed/melted together. I've seen this happen before.
If this all looks good take a test light, turn the key on, and check for battery voltage on one of the terminals of the IPR connector. One side is key on hot, the other side is grounded by the PCM to control high pressure oil. As long as you have the key on hot there the system is good. Don't bother trying to check the ground side at this time. It's a little complicated to do. You would need to set a voltmeter to duty cycle and check the pulse width modulated signal from the PCM. Enough gibberesh from me! We'll assume it's good.
The next step would be to try a new IPR. It's likely that, or a biased ICP sensor. Usually an ICP sensor will throw different codes though. Hope this will help you out. Let me know if you have any questions.