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DTC P0560: System Voltage

  1. If engine electrical diagnostic system check was performed, go to next step. If engine electrical diagnostic system check was not performed, go to ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position. Using scan tool, observe IGNITION 1 signal parameter in PCM data list. If IGNITION 1 signal is less than 11 volts, go to next step. If IGNITION 1 signal is 11 volts or more, go to step  6.
  3. Using scan tool, compare BATTERY VOLTAGE parameter in Dash Integration Module (DIM) data list with IGNITION 1 signal parameter in PCM data list. If readings differ by 0.5 volt or more, go to next step. If readings differ less than 0.5 volt, go to TEST A: CHARGING SYSTEM TEST  under SYSTEM TESTS.
  4. Test PCM battery positive voltage circuit for high resistance. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If no problem exists, go to next step. If problem exists, repair circuit as necessary and go to step  7.
  5. Inspect PCM harness connector for poor connections. If no problem exists, go to next step. If problem exists, repair circuit as necessary and go to step  7.
  6. Replace PCM. After replacement, reprogram PCM. See POWERTRAIN CONTROL MODULE under REMOVAL & INSTALLATION in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article in ACCESSORIES & EQUIPMENT. After repairs are made, go to next step.
  7. Using scan tool, review and record scan tool fail records data. Clear DTCs. Operate vehicle at less than 25 MPH with engine speed greater than 1500 RPM. Using scan tool, observe Specific DTC Information for DTC P0560 until test runs. If scan tool indicates DTC P0560 passed this ignition, system is okay. If scan tool indicates DTC P0560 failed this ignition, go to step  2.
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