DTC Descriptor
DTC B1527: High Parasitic Load DetectedDiagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit/System Description
The body control module (BCM) monitors the state of charge (SOC) of the electrical system. If the BCM senses that the SOC at key-on is 30 percent lower than what it was when the engine was running, DTC B1527 will set.
Conditions for Running the DTC
The ignition must be in Accessory or Run mode for this code to set.
Conditions for Setting the DTC
The SOC at key-on is 30 percent lower than when the engine was running and battery drain is more than 2 amps.
Action Taken When the DTC Sets
There is no battery telltale illuminated or DIC message displayed.
Conditions for Clearing the DTC
| • | The DTC will clear if the fault does not return after 50 consecutive ignition cycles. |
| • | The DTC will clear when run SOC is greater than or equal to 80 percent. |
Reference Information
Schematic Reference
Starting and Charging Schematics
Connector End View Reference
Engine Electrical Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, with scan tool compare the Prev. State of Charge and Start Up State of Charge parameters. The readings should not differ my more than 30%.
| ⇒ | If the readings differ by more than 30%, go to Battery Electrical Drain/Parasitic Load Test . |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
