The power steering control module (PSCM) has a discrete battery voltage supply circuit. The PSCM monitors the voltage level on this circuit to protect itself against high voltage damage.
This diagnostic procedure supports the following DTC:
DTC C0900 Device 1 Voltage High
The ignition is ON.
The electric power steering (EPS) system voltage is greater than 17 volts.
• | DTC C0900 is stored in memory. |
• | The instrument panel cluster (IPC) displays the SERVICE VEHICLE SOON warning indicator. |
• | The PSCM is disabled to protect itself. |
• | A current DTC will clear when the EPS system voltage returns to less than 15.5 volts. |
• | A history DTC will clear after 100 consecutive ignition cycles with the EPS system voltage less than 15.5 volts. |
• | Using a scan tool |
Jump starting the vehicle can cause DTC C0900 to set. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections for further diagnosis.
Step | Action | Values | Yes | No |
---|---|---|---|---|
Schematic Reference: Power Steering Schematics Connector End Views Reference: Power Steering Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the scan tool display greater than the specified value? | 17 V | Go to Step 3 | |
3 | Test the ground circuit of the power steering control module (PSCM) for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 4 | Go to Diagnostic Aids |
4 |
Does the DTC reset? | -- | Go to Step 2 | System OK |