P0A84

DTC P0A84 or P0A85

DTC Descriptor

DTC P0A84
- Hybrid Battery Pack Cooling Fan Control Circuit Low Voltage

DTC P0A85
- Hybrid Battery Pack Cooling Fan Control Circuit High Voltage

Diagnostic Fault Information

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

Circuit/System Description

The battery energy control module (BECM) monitors the cooling fan to detect if the fan speed is slower or faster than normal. If a failure is detected, the appropriate DTC will set.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

P0A84
* Fan control feedback is less than 5 percent.
* Fan state is ON.

P0A85
* Fan control feedback is greater than 95 percent.
* Fan state is ON.
* Fan command is less than 80 percent.

Action Taken When the DTC Sets

The hybrid system is disabled.

Conditions for Clearing the DTC

P0A84, P0A85

The fan speed control feedback is normal.

Circuit/System Verification

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.

P0A84, P0A85
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.