2010 Cadillac CTS Sedan AWD V6-3.6L Page 774

2010 Cadillac CTS Sedan AWD V6-3.6L Page 774

C0900

DTC C0900

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC C0900 00

- Device Voltage High

Diagnostic Fault Information

Circuit/System Description

The EBCM monitors the ignition voltage. If the voltage level is too high, damage may result in the system. When a high voltage condition is

detected the EBCM turns OFF the system relay which removes battery voltage from the solenoid valves and pump motor.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The system voltage is greater than 16 V for 100 msec.

Action Taken When the DTC Sets

* Traction Control System (TCS) and Vehicle Stability Enhancement System (VSES) disabled for the duration of the ignition cycle.

* ABS disabled if ignition voltage exceeds 19.5 V.

* The TCS indicator turns ON.

* The Antilock Brake System (ABS) indicator turns ON if voltage exceeds 19.5 V.

* The driver information center (DIC) displays the SERVICE STABILITRAK / SERVICE TRACTION CONTROL message

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.

* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

* A high voltage value in multiple modules indicates a concern in the charging system.

* DTC C0900 could be set by overcharging with a battery charger or jump starting.

* Inspect the ground connection G110 to ensure that it is clean and tight.

Reference Information

Schematic Reference

Antilock Brake System Schematics (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation)

Electrical Information Reference