The Speed Control is not working on my son's jeep,and The service manual says:
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.
What DTC would do that? He has the P0153 code in and out, but why would that impact the speed control.
Also, what are the most common causes of Speed Control failure?