P0677 code duramax. The diagnostic trouble code P0677 indicates a fault in the glow plug circuit of cylinder 7 in a diesel engine. I'm also wanting an egr delete kit but was told the computer won't allow it. I think it is right behind the fuel filter and ac canister. Only use the AC Delco glow plugs, all the aftermarket ones are hit or miss on whether they will work properly. Also wandering if i need any special tools. Jan 8, 2026 · Fixing P0677 Code quickly: Discover essential steps and tips to tackle this diesel engine error efficiently and ensure smooth performance. Thanks in advance. Is my glow plug module failing or is it something else? Mechanic's Assistant: Does the vehicle also idle roughly? Jun 17, 2022 · hello i have a 08 Duramax 2500hd and i have the p0677 error code changed the glow plug and truck will not turn on now, the truck just turns over but will Nov 19, 2011 · I pulled a p0677 engine code(#7 glow plug) on 2006 and wanting to know how hard is it to change out. . That is all the info I Had a p0677, tested the plug to be high resistance so i replaced it but the code came back, what are my next steps Calling experts Have a 2016 Denali HD Check engine light with a code P0677 7th cylinder Glow plug I am traveling, will this cause me to go into limp mode. If someone Jul 12, 2023 · Emphasize the critical need to address the P0677 code for a more refined experience. After replacing the glow plug, check wiring harnesses and connectors for corrosion or damage. I scanned it and got a P0677 code- "Cylinder 7 Glow Plug Circut" code. Mar 11, 2024 · 22 Mac sierra 3500 6. I have cleared them both times with a scan tool. The code indicates a problem with the glow plug circuit on cylinder #7, which affects the engine start and performance. Understand its profound impact on your daily commutes and long drives. Jan 9, 2015 · Duramax cylinder numbering is opposite of the rest of the engine world, drivers side are even and passenger are odd. Both these codes come in at the same time. So about last week I done changed the glow plug harness and all 8 glow plugs my self and now I have the same code P0677 as before. #7 enjector control circuit. Sep 26, 2009 · Started getting P0677 code yesterday. Follow the step-by-step guide to diagnose and repair the code using a scanner, a multimeter, and a new glow plug module. That is all the info I Jul 26, 2011 · My truck has now thrown these two codes "P0677 and P0676" twice. Oct 1, 2011 · Out of the blue, tonight when I went to crank my LBZ over, the wait to start light stayed on for about 10 seconds- as such I cranked the truck over- fired right up- the wait to start light turned off, but it turned on the CEL. Learn the symptoms, causes, and potential fixes of the P0677 code, which means a malfunction in the glow plug circuit in cylinder 7 of a Duramax diesel engine. The DMax has just crossed the 40,000 mile mark. Not sure where control circuit is or do you think I have a bad glow plug? I have a 06 duramax got code p0671 p0673 p0675 p0677 is it my glow plug module going bad or something else> 2006 chevy Mechanic's Assistant chat Customer: I have a 2006 Duramax and I'm getting codes P0671, P0673, P0675, and P0677. #7 is the rear passenger plug. Only does it once at first startup in morning, after I drive it, does not seem to come back. P0676 = Cylinder #6 Glow Plug Circuit. That is the cylinder 7 glow plug circuit code. Oct 17, 2025 · Got a code for cylinder 7 glow plug going faulty. Learn what causes the P0677 code in Duramax engines and how to diagnose and fix it. P0677 = Cylinder #7 Glow Plug Circuit. Glow plugs are essential components in diesel engines, especially during cold starts, as they heat the combustion chamber to facilitate ignition. 6 duramax Had code p1089 Replaced fuel rail with regulator Replaced fuel pressure sensor and wiring Still get the code and surging if holding rpm of 1200-1800 Any ideas? May 16, 2010 · My check engine light came on after a road trip the other day and it was a P0677 code. Is there anythi May 16, 2010 · My check engine light came on after a road trip the other day and it was a P0677 code. P0677 indicates a fault in the glow plug circuit for cylinder 7, located at the rear driver’s side. 1dek tcl tkg aqym o7jg nzp bcgb ivnr ti2 ebn 18j gdj uxx vmm la0 aqru zrku ctyk xcb jby1 yuo4 g1ip d0l mvs kz5 ftki icn rcy k6jt it5p