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Isuzu Rodeo Reduced Power Light Fix
Another person on came up with this solution and has it posted somewhere, but I'm reinforcing this because it fixed my issue.
OK-- on the main wiring bundel which runs from the engine to the computer module(8"x8" light metal box on drivers side near brake fluid reservoir)....on this wiring bundeled together which contains at least 100 wires, there should be a metal bracket which bolts(10 mm bolt)directly onto the engine. This is the ground connection, and the bolt should have a clean contact and bolted tightly on there otherwise it throws the computer off when the car hits a bump or stops.
Check this item first, hopefully it solves your issue.