P1688 JEEP – Internal Fuel Injection Pump Controller Failure

P1688 JEEP Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1688 JEEP Possible Causes

Good Trip Counter Equals Zero,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

P1688 JEEP Description

Fuel Pump Control Module (FPCM) is monitored with ignition on engine off, and with the engine running. The P1688 code may set if FPCM, Powertrain Control Module (PCM) memory, programming or hardware error is detected.