piper7738w Posted January 8, 2008 Share Posted January 8, 2008 Diagnostic center, while I am driving, will display the warning that the cruise control is disengaged. It keeps repeating this warning. My cruise control works absolutely fine. I push in the cruise button, the light comes on, set the speed, it locks in on the speed, disengages when I set on the brakes. I still get the warning.. How do I solve the problem? Link to comment Share on other sites More sharing options...
padgett Posted January 9, 2008 Share Posted January 9, 2008 Is the engine coolant temp at or near 146F when this happens ? Link to comment Share on other sites More sharing options...
piper7738w Posted January 9, 2008 Author Share Posted January 9, 2008 padgett, Do not know, I will check it tomorrow. Thank you. Link to comment Share on other sites More sharing options...
piper7738w Posted January 10, 2008 Author Share Posted January 10, 2008 Padgett, I checked diagnostics, The warning comes on as soon as I put the car in drive. I checked the codes. It shows B671 cruise-servo position sensor circuit as a current code. Looked in the service manual under all the headings for cruise control.Don't know where to start. servo? cruise brake switch? Vacuum solenoid? vent solenoid? Open for all suggestions. Thank you Bob Link to comment Share on other sites More sharing options...
Ronnie Posted January 10, 2008 Share Posted January 10, 2008 <div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body"> The warning comes on as soon as I put the car in drive. </div></div>Knowing this, I would start by troubleshooting code B660 in the FSM page 8D2-70. Could be the transmission park/neutral switch at fault. Will the car start in drive? If you have a 91 model there may be other switches that could cause it also. Link to comment Share on other sites More sharing options...
padgett Posted January 10, 2008 Share Posted January 10, 2008 That sounds like an open in the servo (black thingie under the intake hose on driver's side of the engine compartment. Try R&Ring the connector first.Bad news: servo assembly is very expensive from GM. Good news: they are on almost every GM car of the period. Link to comment Share on other sites More sharing options...
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