Search results

Search the forum Search Articles
  1. S

    P0652 and low 5V reference voltage

    Hi guys, About a month ago my truck wouldn't start and I narrowed it down to blown up FICM. A month later I found a FICM and the truck starts right up, However I have a P0652 Sensor Reference Voltage B Circuit Low and the truck is in the limp mode. I've measures the reference voltage and it is...
  2. S

    2005 Silverado Duramax LLY Crank No Start, please help

    Well that's good to know, I'm eliminating the fuel line for sure then, and will see if I can move it somewhere cooler. It honestly puzzles me why GM is hell bent on keeping sensitive electronics in the engine bay. There is no reason whatsoever to keep the ECM, TCU and the FICM in the engine bay...
  3. S

    2005 Silverado Duramax LLY Crank No Start, please help

    I took the board off and unfortunately it's not just the capacitor, there are a few resistors on the back that are blown as well. I found another FICM and it's on its way south so hopefully that will fix the problem. I'm gonna relocate it to the fender with a big aluminum heat-sink and eliminate...
  4. S

    2005 Silverado Duramax LLY Crank No Start, please help

    I can't think of anything that would send high voltage to the FICM, the only possible thing is the alternator failing and sending AC voltage.
  5. S

    2005 Silverado Duramax LLY Crank No Start, please help

    Here's the update, the FICM finally let the magic smoke out. I went through every wire, every fuse, every connection on ECM, TCM and changed and repaired everything that looked suspicious. After two days of wrapping and looming, finally I cranked the truck. Right away the it threw a P0652 code...
  6. S

    2005 Silverado Duramax LLY Crank No Start, please help

    Thanks Tom. In that case the FICM from LB7 won't work with LLY, as the high voltage drivers are pushing more.
  7. S

    2005 Silverado Duramax LLY Crank No Start, please help

    I think the LB7 was 90V and the LLY is 48V, but again I've read that LB7 injectors (higher voltage) work on LLY (lower voltage) as well. Now what i don't know is that if LLY injectors work on LB7. I really don't wanna play mad scientist and burn 8 injectors too!
  8. S

    2005 Silverado Duramax LLY Crank No Start, please help

    I'll try that now. I'm taking off the entire engine harness, removing the loom and going over every wire one by one right now. Then i'll pull all the glow plugs and check of injector mists. changing all fuel lines to transparent lines and let's see where it goes. You don't happen to know if the...
  9. S

    2005 Silverado Duramax LLY Crank No Start, please help

    Batteries have been disconnect several times to no avail. I also checked every wire coming out of the ECM, FICM and nothing is broken or cut as far as I can tell. I opened up the FICM, it's clean as a whistle with nothing out of ordinary looking at it with magnifier and taking macro...
  10. S

    2005 Silverado Duramax LLY Crank No Start, please help

    Wires look visually good, nothing disconnect or broken but as far as testing it no.. wouldn't it throw a code?
  11. S

    2005 Silverado Duramax LLY Crank No Start, please help

    Hi guys, I started my truck , a 2005 2500HD Duramax LLY to warm it up after a few days. It started right up with no hesitation. I went to get in after a few minutes and it died. I cranked but it wouldn't start. and it's been 5 days now. Here's the list of things I checked and I know: 1...
Top Bottom