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P06E4




DTC P06E4

Diagnostic Instructions

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

DTC Descriptor
DTC P06E4 00
- Control Module Wake-Up Circuit Performance

Diagnostic Fault Information






Circuit/System Description

The accessory wake up serial data 2 circuit is energized by the hybrid powertrain control module 2 to immediately activate other control modules connected to this circuit when the body control module (BCM) signals the powertrain control module 2 that serial data is required.

Depending on the option content, control modules that may receive the wake up signal are as follows:

* 14 V Power Module
* Battery Charger
* Battery Energy Control Module (BECM)
* Electronic Brake Control Module (EBCM)
* A/C Compressor
* Transmission Control Module (TCM)
* Engine Control Module (ECM)
* Power Inverter Module

Conditions for Running the DTC

* The system voltage is between 9-16 V.
* The vehicle power mode master requires serial data communication to occur.
* The hybrid powertrain control module 2 attempts to wake up the control modules connected to its control module output wake up circuit.

Conditions for Setting the DTC

The hybrid powertrain control module 2 detects a fault in the control module output wake up circuit.

Action Taken When the DTC Sets

* The DTC P06E4 is a type A DTC.
* The control modules is never signaled; therefore the specific subsystems will not function.
* The vehicle will not start while the circuit is shorted to ground.
* The MIL will illuminate, along with several DIC messages.

Conditions for Clearing the DTC

* The DTC P06E4 is a type A DTC.
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

Short to ground will also set multiple no communication codes for high speed GMLAN control modules.

Reference Information
Schematic Reference

* Data Communication Schematics [1][2]Electrical Diagrams
* Control Module References Programming and Relearning

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Data Link Communications Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information
Special Tools

EL-48900 - HEV Safety Kit

For equivalent regional tools, refer to Special Tools Tools and Equipment.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.


The High Voltage Disabling procedure will perform the following tasks:


* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.


Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:


* Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.


- Visually and functionally inspect the gloves before use.

- Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.


Failure to follow the procedures exactly as written may result in serious injury or death.


Note: Use the schematic to identify the following:

* The control modules that share the K114B hybrid powertrain control module 2 terminal 69 X2 accessory wake up serial data 2 circuit
* The control module B+, ignition, and accessory wake up serial data 2 circuit terminals

1. Vehicle OFF, disconnect the X2 harness connectors at the K114B hybrid powertrain control module 2.
2. Vehicle OFF and all vehicle systems OFF, all keys at least 3 meters away from vehicle, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for greater than 100 ohm, but less than infinite resistance, between the accessory wake up serial data 2 circuit terminal 69 X2 and ground.

• If less than the specified range, refer to Testing the Accessory Wake Up Serial Data 2 Circuits for a Short to Ground.

• If infinite resistance, test the accessory wake up serial data 2 circuit for an open/high resistance.

3. Vehicle in Service Mode, verify that a test lamp illuminates between each B+ circuit terminal and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the K114B hybrid powertrain control module 2.

4. Vehicle in Service Mode, verify that a test lamp illuminates between each ignition circuit terminal and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the K114B hybrid powertrain control module 2.

5. If the circuits test normal, replace the K114B hybrid powertrain control module 2.

Testing the Accessory Wake Up Serial Data 2 Circuits for a Short to Ground
1. Perform the High Voltage Disabling procedure before proceeding with this diagnostic. Refer to High Voltage Disabling High Voltage Disabling.
2. Reconnect the 12 V battery.
3. Vehicle OFF, disconnect the harness connector at an easily accessible control module that shares the K114B hybrid powertrain control module 2 terminal 69 X2 accessory wake up serial data 2 circuit.
4. Test for less than 100 ohm between the K114B hybrid powertrain control module 2 accessory wake up serial data 2 circuit terminal 69 X2 and ground.

• If greater than the specified range, replace the control module that was just disconnected.

5. Repeat step 3 until all control modules on the K114B hybrid powertrain control module 2 accessory wake up serial data 2 circuit terminal 69 X2 have been disconnected.
6. Repair the short to ground on the accessory wake up serial data 2 circuit.

Repair Instructions

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

Control Module References Programming and Relearning for control module replacement, programming and setup.

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