Compression Ignition Addict
Join Date: Nov 2011
Location: The great state of Warshington
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I'm assuming you have code P1280, as opposed to P01280? One too many digits in the second one.
Given the CEL came on immediately after working in the valley, I'd suspect a connection got jarred loose during the work.
For the PO603, this is simply a KAM (Keep Alive Memory) code. Any chance you've had a dead battery, or unhooked the batteries recently? This code won't throw a CEL, so chances are it has been stored for a while.
P1280 is a ICP code, meaning low or uncontrollable ICP. My first guess would be to check connection to ICP. If this checks out good, also check IPR connections before throwing any parts at it.