P1B41
DTC P1B41
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P1B41
- Drive Motor Control Module Hybrid/EV Battery Voltage Isolation Sensing Performance
Circuit/System Description
The vehicle is equipped with a high voltage isolation sensor rationality or performance fault detection. The purpose of the isolation voltage sensor monitor is to test the rationality between the sum of the high voltage positive and negative current sensed voltages against the high voltage sensed value and also against the high voltage value from the battery pack energy control module. This is part of the passive isolation monitor.
Conditions for Running the DTC
Main contactor is commanded closed.
Conditions for Setting the DTC
All the following conditions exist:
* The mid-pack positive voltage minus the mid-pack negative voltage minus the high voltage battery voltage is greater than 15 V and he mid-pack positive voltage minus the mid-pack negative voltage minus the high voltage is greater than 10 V
* The mid-pack positive voltage minus the mid-pack negative voltage minus the high voltage is greater than 10 V
Action Taken When the DTC Sets
DTC P1B41 is a type B DTC.
Conditions for Clearing the DTC
DTC P1B41 is a type B DTC.
Reference Information
Schematic Reference
Hybrid/EV Energy Storage Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left
Description and Operation
Drive Motor Battery System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
EL-48900 - HEV Safety Kit
For equivalent regional tools, refer to Special Tools .
Circuit/System Verification
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure includes the following steps:
* Identify how to disable high voltage.
* Identify how to test for the presence of high voltage.
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
* Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
- Visually and functionally inspect the gloves before use.
- Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.
Failure to follow the procedures may result in serious injury or death.
Danger: The eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
1. Ignition ON.
2. Verify P1B41 is not set.
• If P1B41 is set
Replace the K59 Starter/Generator Control Module.
• If P1B41 is not set
3. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Control Module References Control Module References for Starter/Generator Control Module replacement, programming, and setup