P1689 JEEP – No Communication Between ECM and Injection Pump Module Data

P1689 JEEP Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1689 JEEP Possible Causes

Faulty Fuel Pump Control Module (FPCM),Fuel Pump Control Module (FPCM) harness is open or shorted,Fuel Pump Control Module (FPCM) circuit poor electrical connection

P1689 JEEP Description

Fuel Pump Control Module (FPCM) is monitored with ignition on engine off, and with the engine running. The P1689 code may set if FPCM, Powertrain Control Module (PCM) memory, programming or hardware error is detected.