P1A25

DTC P1A25, P1A2C, or P1A33

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P1A25
- Hybrid Battery 1 Voltage Performance

DTC P1A2C
- Hybrid Battery 2 Voltage Performance

DTC P1A33
- Hybrid Battery 3 Voltage Performance

Circuit/System Description

The battery energy control module (EBCM) performs a rationality check for the module voltage sensor 1, 2, and 3. If the voltage is not valid, the appropriate DTC will set.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

P1A25
* Module Voltage 1 - Module Volts Average is greater than 6 volts.
* Module Volts Average = MIDDLE (ModVolt1, ModVolt2, ModVolt3) + (PackVoltage/3) + (PowerElectronicsVolt/3) / 3.

P1A2C
* Module Voltage 2 - Module Volts Average is greater than 6 volts.
* Module Volts Average = MIDDLE (ModVolt1, ModVolt2, ModVolt3) + (PackVoltage/3) + (PowerElectronicsVolt/3) / 3.

P1A33
* Module Voltage 3 - Module Volts Average is greater than 6 volts.
* Module Volts Average = MIDDLE (ModVolt1, ModVolt2, ModVolt3) + (PackVoltage/3) + (PowerElectronicsVolt/3) / 3.

Action Taken When the DTC Sets

The hybrid system is disabled.

Conditions for Clearing the DTC

P1A25, P1A2C, P1A33
* Pack Voltage = Valid.
* System voltage 11 volts - 18-volts.
* Startup Timer is greater than 6 seconds.
* Battery Current = Valid.
* -5 Amps is less than Battery Current is less than 5 Amps.

Circuit/System Verification

Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.

Caution: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.

P1A27, P1A2C, P1A33
1. If DTC is history, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics
2. If DTC is current, replace the BECM.

Repair Instructions

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

Control Module References for BECM replacement, setup, and programming.