Your vehicle’s ECM or powertrain control module (PCM) has lost its control over one or more actuator modules. Most vehicles have as many as 18 actuators that the primary ECM controls. It does so through a controller area network (Can Bus Automotive Network), which is a series of wiring harnesses from the ECM to the controllers. The controllers operated by the ECM, known as modules, control the majority of the functions of your vehicle. The code P0600 was set when the ECM recognized a loss of communication and control over one or more of these modules for eight consecutive starts.

DTC Codes – P0600-P0699 – Computer Output Circuit:

P0600-P0699
P0600-P0699
  • P0600       Serial Communication Link Malfunction
  • P0601       Internal Control Module Memory Check Sum Error
  • P0602       Control Module Programming Error
  • P0603       Internal Control Module Keep Alive Memory (KAM) Error
  • P0604       Internal Control Module RAM Error
  • P0605       Internal Control Module ROM Error (Module Identification Defined by SAE J1979)
  • P0606       PCM Processor Fault
  • P0608       Control Module VSS Output “A” Malfunction
  • P0609       Control Module VSS Output “B” Malfunction
  • P0620       Generator Control Circuit Malfunction
  • P0621       Generator Lamp “L” Control Circuit Malfunction
  • P0622       Generator Field “F” Control Circuit Malfunction
  • P0650       Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
  • P0654       Engine RPM Output Circuit Malfunction
  • P0655       Engine Hot Lamp Output Control Circuit Malfunction
  • P0656       Fuel Level Output Circuit Malfunction

DTC Codes – P0600-P0699 – Computer Output Circuit: