2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1209

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1209

resistance changes with battery temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the

lower the resistance of the sensor. The drive motor generator battery control module uses the battery temperature sensors to control the battery

cooling fan operation.

The hybrid powertrain control module monitors the average battery pack temperature over serial data. When the average drive motor generator

battery temperature exceeds the calibrated temperature the hybrid powertrain control module will set DTC P0A7E and send a command to the drive

motor generator battery control module to open the high voltage contactors.

Conditions for Running the DTC

* DTC P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, or P0AEB is not set.

* The ignition is ON.

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

Conditions for Setting the DTC

P0A7E

The hybrid powertrain control module detects an average battery temperature greater than 73掳C (163.4掳F) for 5 seconds.

P1ABE

One of the following conditions exists:

* The drive motor generator battery control module detects an average battery temperature increase of 2掳C (35.6掳F) in a 20 second event for 3

consecutive events totaling 60 seconds.

* The drive motor generator battery control module detects 2 battery temperature sensors greater than 65掳C (149掳F) for 5 seconds.

* The drive motor generator battery control module detects any battery temperature sensor greater than 70掳C (158掳F).

Action Taken When the DTC Sets

P0A7E

* DTC P0A7E is a type C DTC.

* The hybrid powertrain control module commands the drive motor generator battery control module to open the high voltage contactors relays

when the vehicle speed is below 5 km/h (3 mph).

P1ABE

* DTC P1ABE is a type C DTC.

* The drive motor generator battery control module sends a message to the hybrid powertrain control module requesting the high voltage

contactors open. The hybrid powertrain control module will command the contactors relays open when the vehicle speed is less than 5 km/h

(3 mph).

Conditions for Clearing the DTC

DTCs P0A7E and P1ABE are type C DTCs.

Diagnostic Aids

* Battery temperatures can be affected by vehicle load, outside temperature and customer driving conditions. Test drive the vehicle, and

attempt to simulate the Freeze Frame/Failure Record conditions this DTC set under.

* Inspect for the following:

- Air inlet and outlet for blockage.

- Loose or poor connections at the drive motor generator battery control module temperature sensor module X3 harness connector.

- Damage to the drive motor generator battery control module temperature sensor module wiring harness.

- Damage to the fan or blades.

- Damage to the internal drive motor generator battery cooling air outlet duct seals.

* Test the resistance across each temperature sensor 5 V reference and low reference circuits. Refer to Temperature Versus Resistance ().

* If the hybrid batteries are at or above the temperature values for setting these DTCs, allow the hybrid batteries to cool down by letting the

vehicle stand at room temperature, this could take 4 to 8 hours.

* Use the scan tool output control to test the drive motor generator battery vent fan operation.

* Inspect the ground circuit for the drive motor generator battery vent fan relay.

* Inspect the drive motor generator battery vent fan relay connections.

* Refer to Generator Battery Temperature Sensor Location () for the proper locations of the four temperature sensors.

Reference Information

Schematic Reference

Hybrid Cooling Schematics ()