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Hello, I recently bought a 2000 GMC Sierra 2500 extended cab SLT 2wd with the 5.3L. I was very excited about this truck initially as I got it at a great price, but I am starting to become overwhelmed with all of its problems I recently discovered. The previous owner purchased this truck at an auction, and put a lot of new parts on it mechanically and cosmetically. There are a lot of mis-matched parts on this truck and I can tell it is somewhat of a "Frankenstein." One thing I noticed is that there are 4x4 buttons on the dash, even though this is a 2wd truck (no T-case). So obviously someone put a new dash on from a 4wd donor. Also, the plastic around the ignition cylinder looks like its been monkeyed with, so someone was probably fooling around near the steering column. When I test drove the truck, the only light on was "Service Engine Soon." However, when I brought my truck to get an OBDII scan at the parts store it returned 14 codes (some duplicates) which are as follows: B0017 - Passenger frontal deployment loop open B0024 - Driver deployment loop short to ground B0036 - Discriminating sensor open or short to voltage B0051 - Deployment commanded C0265 - EBCM relay circuit P0430 - Catalyst system - Low efficiency (Bank 2) P0440 - EVAP system P0449 - Evaporative canister vent solenoid control circuit But, NO lights are ever on the dash except the SES. Shouldn't the airbag or SRS light be on as well? On startup the only lights that come are the SES, nothing else. All the gauges work, although they bounce oddly when I shut off the truck. The voltage needle also twitches very slightly when I use the turn signal. Also, when I turn on the headlamps, the only thing lit up is the cluster. The radio, climate controls, and everything else is dark. And, when I cleared the codes with the ODBII scanner, the radio went off and reset itself to 1:00?! I have literally spent hours on end searching in vain for a definitive answer to this host of problems with only little success. I am guessing that the "B" codes mean that I need a new SDM? Perhaps this truck was in a wreck? P0430 might be because of a small exhaust leak this truck has, or possibly the cat is bad. P0440 and P0449 might mean I need a new EVAP solenoid or can? Please help me, it would be greatly appreciated. This truck means a lot to my little family as it is how we are getting across the country for my new job in Tallahassee. Any insights would be very welcome. Thank you all.
First post here as I've had pretty good luck with my 2000 1500 Series 4.3L Silverado... Until today that is... Today it threw P0440 and I hooked it up to a smoke machine to find that the Vent Valve that's mounted in the Fuel Tank has it's end cracked off. Specifically the tube that comes off the valve which goes to the vapor canister. Smoke billowed out of it. I bought the Truck in 2003 and have never touched the top of the tank or had any massive Evap air leaks. Per the 1st pic below the valve appears to have been abused and mangled however today is the first day I've ever even looked at it. Perhaps some of you have run into this b4 and may be able to answer a few questions? 1. Is this valve bonded to and an integral part of the fuel tank making it non removable? 2. A part number 911-001 by Dorman (2nd smaller pic) led me astray as the diameter is about 1.5" and my Vent valve appears to be about 3 to 3.5" in diameter. 3. The Dealer says this Vent Valve is not available and I'm SOL. Does anyone know if this part is available anywhere? B4 I even contemplate looking for a new (maybe discontinued) Gas Tank ($675-) although I found one place who lists it as available or even used Tank would any of u know if a new Tank even has this valve on it? My plan (b4 any Forum feedback) would be to drop the tank and see if I can Drill and tap the existing valve with a 1/8" or 1/4" NPT Tap to accept a male fitting to hose barb, or try and get the old valve out & bond the smaller Dorman valve with Gas Tank Epoxy to a Plastic Disk and then bond that to the Fuel Tank even though that seems real hoaky... However I'm wondering what options any of u may have run into b4 as I searched the Forum and found nothing related to this issue. The last 2 pics show the vent valve (Blue) mounted on tank. Looks like if I can't fix it I may end up driving 6 hours roundtrip to buy a used tank... Scary, unless any of you have any better ideas?