Hello, quick glow plug question.

My sister has an 05 CRD and about a year ago we got a code for one of the glow plug control circuits being low. I went ahead and ordered 4 of the Italian replacement glow plugs but she never got them installed. Fast forward to now, her Jeep is in warm california and starts up just fine. I just did another code scan and now the jeep has p1261, p1263, p1265, and p1267 showing that all 4 glow plug control circuits are low. So my question is, are all 4 glow plugs bad and I should go ahead and have the new ones installed? Or is this some other kind of issue with a sensor or computer? I'm curious because the jeep starts easily and I wouldn't think it would if all 4 were bad.

I've also got these other codes just in case they are relevant to the glow plug codes:
p0299 BOOST PRESSURE SENSOR POSITIVE DEVIATION
P0401-EGR SOLENOID CIRCUIT NEGATIVE DEVIATION.
P0725-ENGINE SPEED SENSOR CIRCUIT .


Thank You

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2006 Green CRD Limited -- 32,000 miles -- Predator Tune -- K&M Air Filter --
(2005 Grey CRD Sport) Sister's
(2006 Gold CRD Limited) Dad's
(1997 GMC 2500 w/ GFS WVO)
(2007 Arctic Cat Diesel ATV)

Replace those glow plugs like yesterday before tips fall off and cause engine damage as has happened. Yes in warm weather the vehicle will start just fine with glow plugs not working.

As to the P0299 see my comments as to one possible cause at viewtopic.php?f=5&t=77010&p=808355&hilit=+p0299#p808355

On the other codes go to Sir Sam's NOOB guide and follow the links to download a copy of the 05 and 06 FSMs (05 lacks diesel cooling data and diagnostics but has illustration keys while 06 is the reverse). Look up codes in 06 manual for hints as to issue.

If she lacks GDE tune then get one but only after glow plugs get done IMMEDIATELY

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Thanks Papadingo, I'll get the glowplugs swapped out ASAP. Put her jeep on ORM, cleared codes, took it for a drive, and all that is left are the glow plug codes so I'm inclined to think that 299 and 401 were EGR related. 725 is a transmission speed sensor which is supposed to trip if idle rpm falls below 350 or exceeds 8000... didn't come back so I'm not going to worry about that one either.

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2006 Green CRD Limited -- 32,000 miles -- Predator Tune -- K&M Air Filter --
(2005 Grey CRD Sport) Sister's
(2006 Gold CRD Limited) Dad's
(1997 GMC 2500 w/ GFS WVO)
(2007 Arctic Cat Diesel ATV)

All four? Are you sure the harness isn't just unplugged? It would be worth it to measure the resistance of all the plugs at the harness before ordering new ones.

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

I haven't checked to see if the harness is unplugged, that would be a good idea... I'll have to go dig out my ohm meter but that will be a good break from desk work tomorrow. I already have all 4 of the new plugs.... but yeah, a harness plug in would be easier!

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2006 Green CRD Limited -- 32,000 miles -- Predator Tune -- K&M Air Filter --
(2005 Grey CRD Sport) Sister's
(2006 Gold CRD Limited) Dad's
(1997 GMC 2500 w/ GFS WVO)
(2007 Arctic Cat Diesel ATV)

Oh yeah, just reread and noticed you already have the new ones. I've just never heard of someone having all four go out. Usually it's one or two.

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.