DTC C1300
Diagnostic InstructionsDTC Descriptor
DTC C1300

Power Transfer Unit Supply Circuit

Symptom Byte Information:Symptom Byte List

Circuit/System Description

The control module monitors the system voltage to ensure that it stays within the proper range.

Conditions for Running the DTC

Ignition=OnorEngine=Running

Conditions for Setting the DTC

Control Module Voltage=Less than 9 VorGreater than 15 V—For greater than 5 s

Actions Taken When the DTC Sets
  • A message and/or warning indicator may be displayed to the driver.
  • Control Module=May be disabled
Conditions for Clearing the DTC
  • System Voltage=9 to 15 V
Diagnostic Aids
  • A low or high voltage DTC set in multiple modules may indicate a concern with the charging system.
  • A possible cause for DTCs regarding high system voltage could be overcharging with a battery charger or jump starting.
Reference Information

Schematic Reference

Starting and Charging Schematics

Control Module References

Connector End View Reference

Master Electrical Component List

Electrical Information ReferenceDTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification
  1. Ignition OFF, measure and record the battery voltage at the battery terminals.
  2. Verify the battery voltage stabilizes between 12.4 and 12.8 V within a few minutes of turning the ignition OFF.
    • If battery voltage is between 12.4 and 12.8 V
  3. Engine running, headlights ON, measure and record the battery voltage at the battery terminals.
  4. Verify the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.
    • If the voltage is not at least 1 V greater than the voltage measured in step 1 or is greater than 15 V.

      Refer to Charging System Test.

    • If the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.
  5. Verify the appropriate control module battery voltage and ignition voltage parameters are available in the scan tool.
    • If parameters are not available in the scan tool

      Refer to Circuit/System Testing

    • If parameters are available in the scan tool
  6. Verify the appropriate control module scan tool battery voltage and ignition voltage parameters are within 1 V of the battery voltage.
    • If not within 1 V of the battery voltage

      Refer to Circuit/System Testing

    • If within 1 V of the battery voltage
  7. All OK.
Circuit/System Testing

Note:

  • Use the schematics to identify the items/configurations listed below:
    • Control modules the vehicle is equipped with
    • The control module's B+, ignition, and ground circuits
    • The control module's circuit terminals and connectors
  • Some control module ground circuits may require up to 20 min after the ignition is turned Off before achieving a resistance reading of less than 5 Ω. In most cases the readings will drop below 20 Ω within 1 min indicating the control modules are going to sleep.

  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector:Appropriate control module.
  3. Test for less than 10 Ω between the test points:Each ground circuit terminal&Ground
    • If 10 Ω or greater
    1. Disconnect the ground connection:Ground terminal
    2. Test for less than 2 Ω between the test points:Ground circuit terminal@Control module harness&The other end of the circuit
      • If 2 Ω or greater»Repair the open/high resistance in the circuit.
      • If less than 2 Ω»Repair the open/high resistance in the ground connection.
    • If less than 10 Ω
  4. Verify a test lamp turns On between the test points:Each B+ circuit terminal&Ground
    • If the test lamp does not turn On and the circuit fuse is OK
    1. Remove » Test Lamp
    2. Test for less than 2 Ω between the test points:B+ circuit terminal@Control module harness&Output terminal@Fuse
      • If 2 Ω or greater»Repair the open/high resistance in the circuit.
      • If less than 2 Ω»Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open
    1. Remove » Test Lamp
    2. Test for infinite resistance between the test points:B+ circuit terminal@Control module harness&Ground
      • If less than infinite resistance»Repair the short to ground on the circuit.
      • If infinite resistance»Replace the component:Control Module
    • If the test lamp turns On
  5. Ignition » On / Vehicle » In Service Mode
  6. Verify a test lamp turns On between the test points:Each ignition circuit terminal&Ground
    • If the test lamp does not turn On and the circuit fuse is OK
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Test for less than 2 Ω between the test points:Ignition circuit terminal@Control module harness&Output terminal@Fuse
      • If 2 Ω or greater»Repair the open/high resistance in the circuit.
      • If less than 2 Ω»Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Test for infinite resistance between the test points:Ignition circuit terminal@Control module harness&Ground
      • If less than infinite resistance»Repair the short to ground on the circuit.
      • If infinite resistance»Replace the component:Control Module
    • If the test lamp turns On
  7. Replace the component:Control Module
Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification