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HOMESERVICE MANUALSGMC2010SAVANA SPECIAL 6.0 GREPAIR AND DIAGNOSISENGINE MECHANICALSTARTERBATTERY, CHARGING SYSTEM AND STARTING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURES (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DTC P0621 (DIESEL)CIRCUIT/SYSTEM TESTING (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)
2010 GMC Savana Special 6.0 G

Circuit/System Testing (Battery, Charging System And Starting System)

2010 GMC Savana Special 6.0 GSECTION Circuit/System Testing (Battery, Charging System And Starting System)
  1. Ignition OFF, test for B+ between the generator B+ output terminal (stud) to ground.
    • If less than the specified range, test the circuit for a short to ground, an open or a high resistance.
  2. Ignition OFF, disconnect the harness connector at the generator.
  3. Ignition ON, test for greater than 3.5 V between the charge indicator control circuit terminal B and ground.
    • If less than the specified range, test the circuit for a short to ground, an open or a high resistance. If the circuit tests normal, replace the ECM.
  4. If the circuit test normal, replace the generator.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.