P1A08

DTC P1A04, P1A05, P1A06, or P1A08

DTC Descriptor

DTC P1A04
- Battery Energy Control Module Programming Read Only Memory (ROM)

DTC P1A05
- Battery Energy Control Module Random Access Memory (RAM)

DTC P1A06
- Battery Energy Control Module Read Only Memory (ROM)

DTC P1A08
- Battery Energy Control Module Stack Overrun

Circuit/System Description

The battery energy control module (BECM) monitors to detect an RAM, ROM, EPROM or controller stack over run. If a fault is detected, the appropriate DTC will set.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

P1A04, P1A06

Checksum does not match.

P1A05

Error during write to a location in RAM.

P1A08

Number of Over Runs is greater than 0.

Action Taken When the DTC Sets

Hybrid system is disabled.

Conditions for Clearing the DTC

P1A04

State = System Powerup.

P1A05, P1A06, P1A08

State = Run or Service or Powerdown or Powerup.

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.

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.