DTC C0899 PSCM
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C0899 03: Device Voltage Low - PSCMDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Battery Voltage | C0899 03 | C0899 03 | -- | -- |
Ground | -- | C0899 03 | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, Engine OFF. Parameter Normal Value: 12.60 Volts | |||
B+ | 0.00 Volts | 0.00 Volts | 12.60 Volts |
Circuit/System Description
The power steering control module (PSCM) monitors the battery voltage available in order to ensure the power steering system has adequate voltage levels to perform the system functions.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The power steering system voltage is less than 9 volts for 1 second.
Action Taken When the DTC Sets
| • | No steering assist is provided. |
| • | The driver information center (DIC) displays the POWER STEERING message. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The PSCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive ignition cycles. |
Diagnostic Aids
A low voltage DTC in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.
- Observe the scan tool PSCM Battery Voltage Signal parameter. The reading should be between 12.6 and 15.0 volts.
| ⇒ | If not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the PSCM.
- Ignition OFF and scan tool disconnected, open and close the drivers door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal A X1 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal B X1 and ground.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 8 X2 and ground.
- If all circuits test normal, replace the PSCM.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for PSCM replacement, setup and programming.
DTC C0899 EBCM
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of this diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C0899 00: Device Voltage Low - EBCMDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | C0899 00 | C0899 00 | -- | -- |
Ground | -- | C0899 00 | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.60 Volts | |||
B+ | 0.00 Volts* | 0.00 Volts* | 12.60 Volts |
Ground | 12.60 Volts | 0.00 Volts* | -- |
*The scan tool will not communicate with the EBCM if there is 0 Volts on the circuit. | |||
Circuit/System Description
The electronic brake control module (EBCM) monitors the battery voltage level available for system operation. A low voltage condition prevents the system from operating properly. If the EBCM detects low battery voltage, DTC C0899 00 will set.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The EBCM detects that the system voltage is less than 9 volts (HP7) or 9.2 volts (w/o HP7).
Action Taken When the DTC Sets
| • | The antilock brake system (ABS) is disabled. |
| • | The vehicle stability enhancement system (VSES) is disabled, if equipped. |
| • | The dynamic rear proportioning (DRP), hydraulic brake assist (HBA), and traction control system (TCS) are disabled. (w/o HP7) |
| • | The DRP defaults to hold only. (HP7) |
| • | The TCS is reduced to engine torque reduction only. (HP7) |
| • | The ABS, BRAKE, and VDC indicators turn ON. |
| • | The driver information center (DIC) displays the ESC OFF message 1 time, if equipped. |
| • | The DIC displays the SERVICE ESC message, if equipped. |
| • | The DIC displays the SERVICE TRACTION message. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | The EBCM automatically clears a history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
A low voltage DTC in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.
- Observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be between 12.6 and 15.0 volts.
| ⇒ | If not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 45 seconds. Test for less than 5 ohms between the ground circuit terminals listed below and ground.
- Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.
- If all circuits test normal, replace the EBCM.
| • | Terminal 16 (w/o HP7) |
| • | Terminal 45 (w/o HP7) |
| • | Terminal E (HP7) |
| • | Terminal F (HP7) |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal 2 (w/o HP7) |
| • | Terminal 31 (w/o HP7) |
| • | Terminal A (HP7) |
| • | Terminal B (HP7) |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup and programming.
