2010 Cadillac Truck Escalade RWD V8-6.2L Page 1272

2010 Cadillac Truck Escalade RWD V8-6.2L Page 1272

DTC P0B6E

- Hybrid Battery 11 Circuit Performance

DTC P0B73

- Hybrid Battery 12 Circuit Performance

DTC P0B78

- Hybrid Battery 13 Circuit Performance

DTC P0B7D

- Hybrid Battery 14 Circuit Performance

DTC P0B82

- Hybrid Battery 15 Circuit Performance

DTC P0B87

- Hybrid Battery 16 Circuit Performance

DTC P0B8C

- Hybrid Battery 17 Circuit Performance

DTC P0B91

- Hybrid Battery 18 Circuit Performance

DTC P0B96

- Hybrid Battery 19 Circuit Performance

DTC P0B9B

- Hybrid Battery 20 Circuit Performance

Circuit/System Description

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery

module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred

to as the hybrid battery. The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The

drive motor generator battery control module monitors the hybrid battery voltage on the twenty battery modules. The drive motor generator battery

control module determines the actual terminal voltage by monitoring the output voltage from the high voltage contactors.

The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and

system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through

serial data. They hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

Conditions for Running the DTC

* The ignition is ON.

* The 12 V battery voltage is 9-18 V.

* High voltage contactors are closed.

Conditions for Setting the DTC

DTCs P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87,

P0B8C, P0B91, P0B96

The voltage of any two consecutive batteries multiplied by 20 is 70 V greater than or less than the total pack voltage for 16 seconds.

DTC P0B9B

The voltage of battery 20 multiplied by 20 is 70 V greater than or less than the total pack voltage for 16 seconds. DTC P0B9B only requires one

voltage failure because battery 20 is the last battery.

Action Taken When the DTC Sets

* DTCs P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88,

P0B8D, P0B92, P0B97, and P0B9C are type B DTCs.

* The drive motor generator battery control module commands the battery vent fan to high speed.

* If more than 4 of these DTCs are set, the drive motor generator battery sends a message to the hybrid powertrain control module to reduce the

power use limit to 50 percent.

Conditions for Clearing the DTC