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Old 02-28-2019, 01:49 PM   #1
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engine new codes issues

2004 ram hemi Well have gotten a P0442 an P0455 last couple days I know its something to to with evap system haven't checked yet ,,then yesterday had been out driving truck and stopped at a friends for hour or so and started truck and had no throttle and the lighting bolt flashing,,truck would idle but no giving it fuel,,shut off restarted and was fine but it threw P0442 P0551 P0340 unsure how they all relate to each other ,,cleared them and running normal again and it has a new cam an crankshaft position sensors already replaced ,,would a power steering pressure switch cause the the no throttle an the P0340 codes ?
The previous owner said it would stall on long drives but always restart but I don't know if he was getting these codes or if the stalling he experienced is what happened to me this time ,,any comments would be appreciated of related issues

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Old 02-28-2019, 06:06 PM   #2
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This could be a wiring issue heat related or a shorting our sensor over some time.
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Old 02-28-2019, 08:15 PM   #3
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Yup, when you start getting random codes, it's time to do some maintenance on all of your chassis ground points. Check all of the wires that terminate in those grounding bundles and make sure they are not corroded. Clear all of the codes and see what returns.
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Old 03-01-2019, 07:13 AM   #4
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would a power steering pressure switch cause the code?
No, the power steering pressure switch won' affect throttle control.
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Old 03-01-2019, 08:03 AM   #5
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Yup, when you start getting random codes, it's time to do some maintenance on all of your chassis ground points. Check all of the wires that terminate in those grounding bundles and make sure they are not corroded. Clear all of the codes and see what returns.
Yeah, I have started on that , already ran a ground wire to the throttle body and cleaned grounds that I have found and will be going over all I can find
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Old 03-01-2019, 08:19 AM   #6
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would a power steering pressure switch cause the code?
No, the power steering pressure switch won' affect throttle control.
I ask the previous owner an he once got code p0551 when it acted up on him, and now this time,,only reason I ask was because it does help idle assist when parking and right now its not doing its job as I can hear and feel the issue in steering when parking ,and I have heard that a a/c pressure switch can affect the electronic 4wd as they share a ground and thought perhaps a similar grounding issue with throttle control but perhaps not,, and I still need to see about the bellcrank I think its called or accelerator pedal position sensor and check out that sensor , has anyone had an issue with that sensor ? I haven't found much discussion on that sensor,,of course it may be vacuum related so I need to search the evap system and take a good look at intake ,,And then I plan on running many new ground wires
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Old 03-01-2019, 08:31 AM   #7
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This could be a wiring issue heat related or a shorting our sensor over some time.
I have checked some of the wiring but need to dig in more and check around for broken or shorted wires , engine has been out so never know what may have happened
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Old 03-01-2019, 09:06 AM   #8
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Some years ago, before B&G flashes and pcm swaps I used the PS sensor as part of my idle strategy. I used a automotive relay to open and close the PS circuit controlled by a rpm window switch set at 1100 rpm. The 03 pcm typically has a target idle 550rpm. The PS mod it would idle at 650rpm giving a solid idle with a PPP 6.1 track cam. B&G companion flash eliminated any need for this mod.
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Old 03-04-2019, 01:32 PM   #9
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As for the power steering pressure switch, mine is starting to give me issues because I should have replaced it with the steering rack @ 230k miles; its design is to ensure that the engine is idling at a sufficient speed to allow smooth steering assist at low speeds in the parking lot or driveway. I haven't been perturbed enough by the stuttering at low speeds (2-3 mph) to want to do a flush/drain and replace the switch.
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Old 03-17-2019, 10:55 AM   #10
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Well took out truck for drive yesterday , drove around about an hour and stopped an shut off truck for another hour , got back in an in a few miles at a stop light I noticed idle was not just right an not accelerating properly an running a little rough,, got to 2nd stop light an ETC lightning bolt flashing an MIL light on an barely limping along, got pulled over shut off and restarted an ran fine no more ETC flashing , after couple of restart cycles an more driving the MIL light went out ,,pulled codes today p0340 p0652 ,,might try another cam shaft position sensor again ,,havent found any bad wiring but will be looking some more,,
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