P1EAB
DTC P1EAB
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 P1EAB
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Battery Energy Control Module Hybrid/EV Battery Cell Overvoltage
Circuit/System Description
The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.
The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack.
The battery energy control module also monitors the cell voltage with internal hardware that is independent from the normal cell voltage path. This alternate method produces a true and false signal that indicates whether or not any cell voltage is too high. This signal is encoded and transmitted via serial data to the starter/generator control module.
Conditions for Running the DTC
The DTC monitor runs at all times, except when the control module self test is running or DTC P1EAC or U182A is set.
Conditions for Setting the DTC
Battery cell voltage is greater than 4.35 V
Action Taken When the DTC Sets
* DTC P1EABA is a type A DTC
* The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur
Conditions for Clearing the DTC
* DTC P1EAB is a type A DTC
* DTC P1EAB is a secure DTC. The Clear Secured High Voltage DTCs Reading and Clearing Diagnostic Trouble Codes procedure must be performed to prevent resetting the DTC.
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Drive Motor Battery System Description 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 Programming and Relearning for scan tool information
Special Tools
EL-48900 - HEV Safety Kit
For equivalent regional tools, refer to Special Tools Tools and Equipment.
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 will perform the following tasks:
* 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 exactly as written 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 DTC P1B34, P1B35, P1B36, P1B37, P1B38, or P1B39 is not set.
• If any of the DTCs are set
Refer to DTC P1B33-P1B39 P1B33. After the repair is complete, the Clear Secured High Voltage DTCs Reading and Clearing Diagnostic Trouble Codes procedure must be performed to clear the secured DTC P1EAB.
• If none of the DTCs are set
3. Verify DTC P0B3B-P0BBB or P1B16-P1B2D is not set.
• If any of the DTCs are set
Refer to DTC P0B3B-P0BBB, P1B16-P1B2D, P1B3D, or P1B3E P0B3B. After the repair is complete, the Clear Secured High Voltage DTCs Reading and Clearing Diagnostic Trouble Codes procedure must be performed to clear the secured DTC P1EAB.
• If none of the DTCs are set
4. Verify DTC P1EAB is not set.
• If the DTC is set
Replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2. After the repair is complete, the Clear Secured High Voltage DTCs Reading and Clearing Diagnostic Trouble Codes procedure must be performed to clear the secured DTC P1EAB.
• If the DTC is not set
5. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Generator Battery Replacement Generator Battery Replacement