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P0380…can’t figure this one out

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Hdshooting98

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Discussion starter · #1 ·
Hi all,

having read copious amounts of posts on here finally decided to make an account and post as I’m stumped.

p0380 heater circuit a. Ongoing issue for the last 18months. 2014 navara, had 2 new sets of glow plugs so blanked off EGR (8mm hole in blank). Now, glow plugs are fine, resistance is fine across all 4, glow plug relay is all good but still coming up no matter how often the code is cleared.

does anyone have any ideas what to try next? Not causing many issues just having to look at a EML all day is doing my head in!

Thanks all
 
Discussion starter · #3 ·
landmannnn said:
Only 2 possibilities,

a wiring fault - check the connectors on the glow plugs

Glow plug relay has a fault, but still works, not so cheap

billcar.biz

Navara D40 Euro 5 Glow Plug/Heater plug Relay - Billcar Limited

Navara D40 Euro 5 Glow Plug/Heater plug Relay 2011 on Part No: 9640469680 unit or oem unit
billcar.biz billcar.biz
Click to expand...
Cheers mate, had a new relay a few months ago and tested it yesterday and all ok so hopefully can rule that out.

Will try the connection to the glow plug as I know 1 of them doesn’t ‘click’ in place like the others do.
 
Discussion starter · #7 ·
An update for anyone who needs it, put a multimeter down the back of each 4 wires on plug behind the battery yesterday, excessive resistance on 2 of the 4 wires, rewired the plug and resistance was normal (1ohm roughly) and no more engine light!
 
#14 ·
Hdshooting98 said:
An update for anyone who needs it, put a multimeter down the back of each 4 wires on plug behind the battery yesterday, excessive resistance on 2 of the 4 wires, rewired the plug and resistance was normal (1ohm roughly) and no more engine light!
Click to expand...
Kudos for this suggestion! I just tried this and got >20ohm on one wire whereas the rest were <0.4ohm. Cleaned up the connector at the glow plug (and all 4 male and female connectors in the plug & socket just for good measure) and now reading <0.4 same as all the others.

UNFORTUNATELY, this has not resolved the engine light coming on. The weird thing is (which I've not seen mentioned on the entire internet) is that my light comes on (with error code P0380, of course) every time on the third cold start. I always get two cold starts after I've cleared the error code where the engine light goes out then on the third cold start the light remains on. (Hot starts don't count because I guess the glow plugs are not used).

Anyone ever heard of this behaviour? Does it give any clues as to the root cause of the fault?

All 4 glow plugs have just been replaced (two were stuck and cost me a fortune to get removed). The relay/pcm has been replaced with a genuine part. The car starts fine now on cold mornings (compared to prior to the glow plugs being replaced) so I think the relay and glow plugs are working as they should but I always get the engine light come back on on the third cold start.

Any other suggestions welcomed.
 
#15 ·
JamesD40 said:
Kudos for this suggestion! I just tried this and got >20ohm on one wire whereas the rest were <0.4ohm. Cleaned up the connector at the glow plug (and all 4 male and female connectors in the plug & socket just for good measure) and now reading <0.4 same as all the others.

UNFORTUNATELY, this has not resolved the engine light coming on. The weird thing is (which I've not seen mentioned on the entire internet) is that my light comes on (with error code P0380, of course) every time on the third cold start. I always get two cold starts after I've cleared the error code where the engine light goes out then on the third cold start the light remains on. (Hot starts don't count because I guess the glow plugs are not used).

Anyone ever heard of this behaviour? Does it give any clues as to the root cause of the fault?

All 4 glow plugs have just been replaced (two were stuck and cost me a fortune to get removed). The relay/pcm has been replaced with a genuine part. The car starts fine now on cold mornings (compared to prior to the glow plugs being replaced) so I think the relay and glow plugs are working as they should but I always get the engine light come back on on the third cold start.

Any other suggestions welcomed.
Click to expand...
A genuine mystery.
There is a small relay in the fuse box next to the battery marked glowplug, have a look at that, I think you can swap it with one of the other relays in that box.
 
#17 ·
JamesD40 said:
OK, thanks a lot for the prompt reply. I'll have a look into that in the daylight tomorrow.
Click to expand...
Hmmm, I couldn't find a relay - other than one marked as Horn Relay. The only thing marked as Glow is a 60A fuse (which is intact) - circled in red in both pics.


There is a similar box on the other side of the engine which has a load of relays in it but none marked as Glow(plug).

I'm in the UK, it's a RHD '63 plate 2.5D D40 Navara 102k miles.

Any other ideas? I think all I'm left with is a wiring fault or a problem with the ECU itself? None of the individual wires that I can see are damaged and the loom looks OK cosmetically. I'm reluctant to start stripping the loom apart just to be able to visually inspect each wire because I'd think it highly unlikely an individual wire within the nicely wrapped-up loom would suffer any kind of failure? Other than melting, I suppose, but I doubt that. Are there continuity or resistance tests that can be done on each wire? I think I'd need a wiring diagram though in order to know which plug pins to test, etc?

I am tempted to run new wires from the 4-pin plug just by the battery (the one I resistance tested per Hdshooting98's suggestion above) to each glow plug in order to eliminate that bit of wiring because those are the bits that have had the most abuse from being (dis)connected to the glow plugs and they vibrate around with the engine I guess...but I don't know how I'd get a good connection to the glow plug itself other than trying to buy the funky connector things. And all seems a bit desperate given they read OK resistance-wise.

And the fact I get 2 cold starts and only on the third one does the engine light stay on is really perplexing.
 
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