3.0 CRD code p0675 (glowplug cylinder 5) error started right after oil change

jamief · Jun 25, 2017

I did an oil change last tuesday and took the decorative cover off the top of the engine while doing it. Completed the oil change and did a test drive and everything was fine but the engine was already warm. The next morning I started her up and got a code p0675 which is an error about glowplug cylinder 5. I've never seen this before. I drove to my destination stopped the truck cleared the code, restarted and the code didn't come back. a few hours later it had cooled down and it came back again. This makes me think it's only failing or being checked if it's working when the engine is cold (I have no idea about the logic behind the glow plugs)

The timing of the error makes me wonder if I bumped the wiring somehow? I checked and nothing looks loose but I'm not sure what I'm even looking for on the top of the engine. Which cylinder is #5?

Assuming I need to replace the glowplug can I replace just one or is it best to do all 6 at the same time?

thx

underscore · Jun 25, 2017

The connectors are tucked out of the way and on there pretty good, it's unlikely you would've bumped it loose. If you're doing one you may as well do all 6 as the others probably aren't far behind.

gcjeepjames · Jun 25, 2017

When I first bought my Jeep almost a year ago, glowplug #2 was shot, and that is the only one I replaced.

I haven't had to replace the others since, so you may not want to consider doing all 6 at the same time.

Chirpz · Jun 26, 2017

I have been replacing mine one at a time... so far I have done two, in the last two years. I would vote to do them one at at time. There is always you might twist one off and have a BIG problem. Many have.

Check out my guide on replacement...

http://www.chirpz.com/swirl/glow_plug.pdf

underscore · Jun 26, 2017

Interesting, it appears the information I was given was incorrect. Ignore my previous post!

Tango. · Jun 26, 2017

I did ALL 6 of mine, not because the others were going to go out so much; but to break them loose and ensure I had a fresh coat of anti-seize on them.
Kept the good ones for spares.
With these aluminum heads there is ALWAYS the chance of striping out the head threads.

jamief · Jun 27, 2017

thanks for the info. It threw the code once yesterday morning but not today. I think I'll track down one of the cap tools mentioned in the write up (thanks chirpz it's awesome) pull the cap and clean the ends up. If the code comes back after that I'll develop a serious sense of patience put away the 5' pipe I use on every project and start pouring on penetrating oil then just do that one.

suzieque · Jun 27, 2017

I'm not at home so I don't have my service manual, but I recall reading that if 1 fails the others will soon follow so plan to do them all. I also recall reading that when 1 fails the others get overloaded, perhaps that is why they fail shortly after.

Tango. · Jun 28, 2017

That is correct, they are the same age and just like other pairs of parts the others may fail.

However, and a big however... I personally think it's best to break them loose every 60k miles and reapply the anti-seize.

The longer they are in there the more chance the treads will come out with them.

Just because it didn't break I do not feel they should not be attended to. Again just personal feelings. Same thing for those fabulous copper O-rings and seats.

3.0 CRD code p0675 (glowplug cylinder 5) error started right after oil change

jamief

underscore

gcjeepjames

Chirpz

underscore

Tango.

jamief

suzieque

Tango.

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