B2123 JEEP – Ignition Run Control Circuit High

B2123 JEEP Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B2123 JEEP Possible Causes

Faulty Run Relay,Run Relay harness is open or shorted,Run Relay circuit poor electrical connection,Faulty Front Control Module (FCM)

B2123 JEEP Description

The Front Control Module monitors the Ignition Run Control Circuit. The Front Control Module will set this Diagnostic Trouble Code (DTC) within 500ms if the Run Relay Control Circuit voltage is shorted to voltage.