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523524-3 is usually tied to a fuel injector circuit fault. As Jose mentioned, check each injector connector and the ECU plug for corrosion or loose pins-disconnect/reconnect to clean contacts. If everything looks good, trace the harness for damage, as intermittent shorts or breaks can trigger that code
Gus,
Remove each injector connector and inspect for corrosion. Do the same for the ECU connector 204. Remove and inspect for corrosion. I would slide the connectors on and off to ensure a good connection. The only other problem would be a failing wire harness. Good Luck.
Which engine is installed in the truck?
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