Question about 1999 GMC Sonoma
When you replaced the computer did u order it new for your truck or did you just get a new one? you may have to do several relearn processes using a scan tool or related tool to get the computer to recognise your key. all gm passlock equipped vehicles have a specific key. even if it looks like a normal key your passlock system measures the resistance of your key and will not let the vehicle start with the "wrong key" for the system. even if it is the same key you have always had you did replace your computer.
Posted on Mar 10, 2009
You have checked spark? These engines won't even try to fire unless they have at least 55 psi fuel pressure.
Posted on Mar 09, 2009
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