After a week of cleaning up my EGR system and putting the Jeep back together, I fire the thing back up tonight. It runs for 5 seconds then dies. Turn the key again, nothing. Just spins. So I plug in my trusty code reader and I see a new one, P0403. WTF. A quick web search reveals that the EGR solenoid could be bad.

I *may* have dropped it when I took it out the first time. And I will check that I got it plugged in all the way.

Do I HAVE to replace the solenoid or can I get around this code with either a SEGR or the GDE computer? At this point I'm sick of it and will sell a kidney to just be done.

thx

P0403 should not be a fatal error. The engine should run, just with a CEL. I think you have knocked loose something else in the area of the EGR.

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Okay, I'll dig around in there and see what's going on.

Would the Jeep do this if the EGR solenoid was unplugged?

P0403 is set if the wiring is disconnected or if the signal is not plausible.

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Follow up for future readers:

The P403 was indeed due to an unplugged solenoid plug. I had inadvertently jostled it loose while putting everything else back. It wasn't snapped all the way in to begin with.

The Jeep dying, I believe, was cause by an air bubble in the fuel filter. I didn't remove the filter to do the EGR clean up. Instead, I unbolted the head and lifted the whole assembly out of the way. I think some of the diesel siphoned back into the tank. So I re-primed the filter and it started right up.

If you haven't replaced that fuel head already, now would be a really good time to start thinking about it anyways.

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X2, the same thing happened to me today as well, I put the front on ramps to change the engine mounts, it started and ran fine for a minute, then it quit and would not start. Code reader did not bring up any new codes. Being a diesel, it has to be a fuel problem. Sure enough the incline drained the system back to the tank. I could not prime it either, so I put a vacuum cleaner outlet side hose into the tank and opened the bleeder for an easy purge. Told my wife not to park it facing up hill.

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