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Old 12-07-2012, 09:01 AM   #1 (permalink)
derek_s44
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glow plug controller problems and more

my truck hasn't been starting well in the cold, found a code saying there's no communication with glow plug controller. replaced the controller and i still have the same problem and code.

also have a fuel temp to high code popping up even below freezing when i first start my truck and my fuel economy display is way off 9.5L/100km or 22mpg and I'm only getting hand calculated 17mpg.

do I have a wiring issue somewhere i cant find?

any helps great, thanks.
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Old 12-07-2012, 01:32 PM   #2 (permalink)
Lo-Buk
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Iirc the new glow plug control module has to be programmed by the dealer.
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Old 12-07-2012, 06:57 PM   #3 (permalink)
derek_s44
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Quote:
Originally Posted by Lo-Buk View Post
Iirc the new glow plug control module has to be programmed by the dealer.
Ive read on other chats that there's no programming needed, but i will ask the stealership tomorrow.
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Old 12-08-2012, 02:13 AM   #4 (permalink)
skleppy
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No programming is needed. When mine went out, R&R'd it and it was like new. If yours is not communicating, there's something else at work...or not in this case. Did you check the relays and fuses to make sure they are all firing?
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Old 12-08-2012, 02:49 PM   #5 (permalink)
derek_s44
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alright thanks, that's what i thought. ill have to go through it all next week.
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Old 12-09-2012, 04:27 PM   #6 (permalink)
BlackMax Canada
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Quote:
Originally Posted by skleppy View Post
No programming is needed. When mine went out, R&R'd it and it was like new. If yours is not communicating, there's something else at work...or not in this case. Did you check the relays and fuses to make sure they are all firing?
Did yours throw a code?

Mine has been starting rough but no CEL. The OnStar email I get shows that I have an Engine Issue that needs attention.

I used OnStar they scanned it and gave me P00671 which doesnt exist in the DTC lookup tool (or the tool isnt working) and it was a Glow Plug Module issue.

Gonna be looking into this a little further see if I can reverse seach and try to match up the code they gave me.
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Old 12-09-2012, 06:21 PM   #7 (permalink)
skleppy
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P0671 is the code for the glow plug on number one cylinder. I didn't even look it up, I just know what it is. If you get P0670, then its the module. The plugs are all numbered 1-8 though.
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04 LLY CC/SB
Bilstein 5100s
H2's with 265s
PPE 120HP Tune
PPE Stage 4 Trans - Built by me with an ML TC
EGR blocked, unplugged and turned off
AEM intake, Plugged resonator, LBZ MP - best intake for an LLY IMO
Custom tranny cooler - by ME
Magnaflow 4" stainless turbo back duals
Autometer Coblat Triple Pillar
FS-2500 bypass with Top Dog Oil filter adapter

"For those of you who confuse horsepower with torque, horsepower is how fast you hit the wall;
torque is how far you shove it back when you hit it"
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Old 12-09-2012, 06:49 PM   #8 (permalink)
BlackMax Canada
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Quote:
Originally Posted by skleppy View Post
P0671 is the code for the glow plug on number one cylinder. I didn't even look it up, I just know what it is. If you get P0670, then its the module. The plugs are all numbered 1-8 though.
hmmm pretty sure the dood said P00671 and Glow Plug module which tells me even more that he didnt really know (one extra 0)....so anyway. He did say he cleared his screen before I asked him the specific number....perhaps he was relying on memory.

I'll get it OnStar read again since my cheap reader wont pick it up and EFI is through a buddy which would be a few days. Will confirm before I buy either.

Thanks!
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2005 Chev 2500 HD LT 4X4 CCSB DMax / Allison
Onyx Black ext, Dark Charcoal interior, Tint
Astrostart 2205
06 Manual Extend Camper Mirrors
MOTTO MT700 Chromes with 285 65 18's BFG
MBRP "COOL DUAL" - Stainless w/cat delete
Prodigy Brake controller
Merchant Auto Competition Transmission w/transfer case pump rub upgrade and brace.

Cognito Pitman and Idler Arm braces, Stainless SD Tie Rod Sleeves
BOSS 9'2" Poly V Plow
Autometer Ultra Lite II's (boost, pyro, oil temp)
DSP5 / EFI Live Tuning by SPi PCV re-route
Kodiak Mouthpiece
TLFTN Member #34

Last edited by BlackMax Canada; 12-09-2012 at 06:50 PM.
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Old 12-09-2012, 10:44 PM   #9 (permalink)
turnpike
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My reference works says open or short in the #1 glow plug control circuit.

Many code readers will not read the codes from any modules except the ECM. That code is from the glow plug controller.
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Last edited by turnpike; 12-09-2012 at 10:45 PM.
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Old 12-10-2012, 05:25 AM   #10 (permalink)
BlackMax Canada
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redid the OnStar diagnostic

p0671
p0675
p0677

So that is 3 GP's down the passenger side. Wondering if something sinister is going on or just crap luck 3 of 4 on the same side.


Going to search on ways to test (ohm) glowplugs while still in the head.
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2005 Chev 2500 HD LT 4X4 CCSB DMax / Allison
Onyx Black ext, Dark Charcoal interior, Tint
Astrostart 2205
06 Manual Extend Camper Mirrors
MOTTO MT700 Chromes with 285 65 18's BFG
MBRP "COOL DUAL" - Stainless w/cat delete
Prodigy Brake controller
Merchant Auto Competition Transmission w/transfer case pump rub upgrade and brace.

Cognito Pitman and Idler Arm braces, Stainless SD Tie Rod Sleeves
BOSS 9'2" Poly V Plow
Autometer Ultra Lite II's (boost, pyro, oil temp)
DSP5 / EFI Live Tuning by SPi PCV re-route
Kodiak Mouthpiece
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