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DTC C1237: High System Voltage

  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
  2. Turn all accessories off. Start engine. Using scan tool, select ABS/TCS DATA LIST. Monitor battery voltage while running engine at about 2000 RPM. If voltage is less than 17 volts, go to step 4)  . If voltage is greater than 17 volts, go to next step.
  3. Using DVOM, check actual battery voltage while running engine at about 2000 RPM. If voltage is less than 17 volts, go to next step. If voltage is greater than 17 volts, diagnose charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.
  4. Test drive vehicle faster than 5 MPH. If DTC C1237 resets, go to next step. If DTC C1237 does not reset, see INTERMITTENTS & POOR CONNECTIONS  under DIAGNOSIS & TESTING.
  5. Replace EBCM/EBTCM.
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