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Showing results for tags 'p0480'.
Found 2 results
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I have a 2005 Tahoe 5.3 with 248,000 miles. On Monday morning I noticed that the cooling fan was running even though I hadn’t started the truck yet. Since then, the cooling fan will run after I turn the vehicle off. What’s odd is sometimes it won’t do it until an hour or 2 after it’s been off. Also my temperature gauge is fine, no overheating. I did a code scan and P0480 comes up. I replaced the relay for cooling fan 1 and no change. I decided to disconnect the battery, cleaned the 2 huge harnesses that go to the PCM, and cleaned the connectors to the fan control fuse block (not sure if that’s the correct term sorry). I even removed and cleaned the connectors to the cooling fans and still no change. Could it be a grounding issue? I think I found the ground connector (passenger side radiator support area) but will have to put the truck on ramps to get a better look and grip on it. I’m kind of lost at this point and was wondering if anyone could help.
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I did a search on here for replacing the engine computer and was surprised for not finding much ! We have an 05 Silverado with a 5.3 in it. The other evening, my wife went to see a friend and when it began to storm, she decided to leave. She went out and the truck was dead, no click, no crank. I went to get her and tried to jump start it (while it was still storming) and arcs came off of the negative terminal when the cable touched it. I stopped and decided to disconnect the battery till morning. Next day I go over there and reconnect the battery and the engine fans start running with no key in the ignition (probable reason why the battery arced the night before)! Battery voltage was down to under 11 volts so I took it to get checked since it was 5 years old. Got a new one, connected it, the truck fired up, and all seemed well. Took the truck home, parked it and 2 hours later I go to leave in it and the engine fans are running again ! When I drove away, I got about a mile from the house and the check engine light started flashing. Codes that came up were P0300 and P0480, random misfire and engine cooling fan code error. So..... I checked what I could, but then on Monday took it to an automotive electrical guy. He ran his diagnostics and while it was there, the fans came on by themselves again with no key on. He check his schematics, ran his checks and suspects the computer has some kind of fault. He said to get a salvage computer and he would re-flash it for my VIN. I checked around and found one local, but also looked online and came across "All Computer Resources" in Miami FL that sells reprogramed ECM / ECU / PCM automotive computers. I wasn't sure what to do, so called another electrical repair guy for another opinion. He said it could well be the computer, but would run his own checks before just replacing it. He was adamant about not using a salvage or reconditioned computer. Said he has been there, done that, and will now ONLY install new OEM replacement GM computers and flash them. Anybody out there have good or bad luck with a reconditioned computer ? Any thoughts or suggestions ?
