1996 Caddy Seville STS

Not sure what the 2042 is, but the p1571 and 1602 are traction control torque request circuit, and loss of ebtcm serial data, respectively. Could it be a possible connection issue, yes. It could also be a faulty EBTCM. If you are not getting any TCS data, it indicates that the ABS module is not communicating for whatever reason. Initial check would be power and ground to th ABS control module. If that checks O.K, then I would suspect the module may be at fault.