B1527

DTC B1527

DTC Descriptor

DTC B1527
- High Parasitic Load Detected

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

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.

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. Battery Electrical Drain/Parasitic Load Test

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests