Cruise control light will only come on while stopped but will not work on-the-move. I got it to work one time but then as soon as I tried to change the speed, it shut itself off and hasn't worked since. I've read some posts on here about this possibly being a vacuum hose issue - anyone have a second opinion for me?

 

Usually it is the ABS sensor in the front drivers side wheel bearing hubs assembly

 

db31,

In some cases it has been found that a cracked or faulty front speed sensor can result in cruise control issues.

 

db31

To expand on what Weedahoe and Dave at DodgeCACares stated, here is information from the Service Manual that maybe useful in the diagnosis.

SPEED CONTROL DIAGNOSIS AND TESTING - ROAD TEST

Perform a vehicle road test to verify reports of speed control system malfunction. The road test should include attention to the speedometer. Speedometer operation should be smooth and without flutter at all speeds.
Flutter in the speedometer indicates a problem which might cause surging in the speed control system. The cause of any speedometer problems should be corrected before proceeding. Refer to Instrument Cluster for speedometer diagnosis.
If a road test verifies a system problem and the speedometer operates properly, check for:

• A Diagnostic Trouble Code (DTC). If a DTC exists, conduct tests per the Powertrain Diagnostic Procedures service manual.
• A misadjusted brake (stop) lamp switch. This could also cause an intermittent problem.
• Loose, damaged or corroded electrical connections at the servo (if used). Corrosion should be removed from electrical terminals and a light coating of Mopar ® MultiPurpose Grease, or equivalent, applied.
• Leaking vacuum reservoir (if used).
• Loose or leaking vacuum hoses or connections (if used).
• Defective one-way vacuum check valve (if used).
• Secure attachment of both ends of the speed control servo cable (if used).
• Smooth operation of throttle linkage (if used) and throttle body air valve.
• Failed speed control servo (if used). Do the servo vacuum test.

CAUTION: When test probing for voltage or continuity at electrical connectors, care must be taken not to damage connector, terminals or seals. If these components are damaged, intermittent or complete system failure may occur.

 

I am having the same problem with my '05 1500 SLT, did you ever discover a fix? Thanks-