P0678... replaced parts, cant figure it out
I did my HG's about 2 months ago or so and went ahead and replaced all the glow plugs and the glow plug harnesses (from Tousley) and started getting a P0678. I was doing some reading on the internet and unplugged the GPCM and tested the glow plugs and all were at 1 ohm. Over the weekend i replaced the GPCM (oem from Tousley) this weekend, cleared the code and it went away for a day and a half and it came back on this afternoon with the same code (P0678) Do you guys have any suggestions?? The only other thing i can think of from reading is to replace that one glow plug again and/or check the battery terminal connections.