My son has a 2004 3.9 V6 auto w/83000mi. Check engine light came on and when we pull the codes, we see a P2004 (only - nothing else). After some searches we find many listed as an IMRC closed code. The car has no IMRC as this is a V8 component. Have also seen a "fuel volume regulator control circuit high". Drive ability and fuel economy hasn't changed. Idle is fine - smooth. Acceleration / lift throttle deceleration is smooth and normal. Any ideas what to check in order of likelihood?
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