LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2001 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 3.0L >> Diagnostic Tests >> DTC P0602: Control Module Not Programmed >> Diagnostic Procedures
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. Using scan tool, clear DTCs. Attempt to start engine. If DTC resets, go to next step. If DTC does not reset, go to step  7 .
  3. Reprogram ECM with correct theft deterrent frequency code. See PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS  under PROGRAMMING. Using scan tool, DTCs. Attempt to start engine. If DTC resets, go to next step. If DTC does not reset, go to step  7 .
  4. Verify equipment being used is functioning properly and all cable connections are clean and tight. Attempt to reprogram ECM again with correct theft deterrent frequency code. Using scan tool, clear DTCs. Attempt to start engine. If DTC resets, go to next step. If DTC does not reset, go to step  7 .
  5. Replace ECM. Program replacement ECM using required equipment. See ENGINE CONTROL MODULE  under PROGRAMMING. Ensure ECM is programmed with theft deterrent code currently on vehicle. After repairs, go to next step.
  6. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine and operate vehicle within code enable criteria. Check for DTCs. If this DTC resets, go to step  2 . If this DTC does not reset, go to next step.
  7. Using scan tool, observe stored information. If scan tool displays any DTCs that you have not diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are present, system is okay.
scientia non olet · About LEMON Manuals