Originally Posted by Rob M

When the traction control relay fails or malfunctions you can get a variety of brake warning lights to include the brake wear indicator. You can also get a speedometer that doesn't work and even get a transmission that limps or is stuck in park. If your traction control relay isn't working, it is probably safe to assume that an additional safeguard was built in to disable the cruise control (I'd have to look that up in the service manual schematics to be sure). You can buy a new RCM here:

More Information for STANDARD MOTOR PRODUCTS RY1562

Another option is to repair your RCM. Individual relays can be replaced. Forum member tighed1 provides an RCM swap/repair service at a nominal cost.

IMHO it is a good idea to always carry an extra RCM (thus the link to a source for new). It is easily the most trouble prone part on a Crossfire, and diagnostic codes don't typically indicate it as the culprit. If you go the repair route, also IMHO, it is best to have all the individual relays replaced (except for the horn which isn't likely to fail due to its infrequent use) because the others may not be far behind the traction control relay (look for pitting/black soot on the contacts). In my case, the traction control relay coil failed, and the engine control, fuel pump, and air pump relays were all failing intermittently.