Originally Posted by jr's3800
I agree with Pontiac Dad..... I say this because the cruise does have to have a Vehicle speed signal for the cruise to work... But that deosn't mean the ECM isn't bad... But I get the feeling that the Cluster has taken a crash...
I would have expected a Service Engine light if the problem was anywhere other than in the cluster. Given their history of random components in the cluster failing when the connector pins get oxidized, I'd say this is just another case of that.
Take the cluster out, check the connections and stick it back together again, per the instructions in TechInfo. It'll give you an opportunity to do a little cleaning while it'* apart, and I suspect the big fat multi-pin connector plug in the back may be the culprit here anyway.