P0659

DTC P0659 Actuator Supply Voltage Circuit High Voltage

Circuit Description

The DEF control module provides battery voltage through the power supply circuit to the following actuators:
- DEF heater valve relay
- DEF supply pump motor
- DEF reverting valve

The power supply circuits are independent of each other outside of the DEF control module and each has a high side driver circuit. If the DEF control module detects a short to voltage on the power supply circuit, this DTC will set.

Condition for Running the DTC

- The ignition switch is OFF.

Condition for Setting the DTC

- The DEF control module detects a short to voltage on the actuator power supply circuit.

Action Taken When the DTC Sets

- The DEF control module requests the ECM to illuminate the MIL. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type A.
- The DEF control module and the ECM apply defaulted warning actions and fail-safe controls. Refer to Default Action and Fail-Safe List.

Conditions for Clearing the DTC

- Refer to DTC Type Definitions for Conditions for Clearing the DTC - Type A or Type B.

Diagnostic Aids

- If an intermittent condition is suspected, refer to Intermittent Conditions in this section.
- This DTC fails immediately before the DEF control module shuts down.

Test Description

The number below refers to the step number on the Circuit/ System Testing.
3. If the DEF heater valve relay control circuit is normal, open circuit DTC P20B1 will set.

Circuit / System Testing DTC P0659