P2048

DTC P2048 Diesel Exhaust Fluid (DEF) Injector Control Circuit Low Voltage

Circuit Description

The DEF injector is attached to the mixer chamber that is located between the DPF housing and the SCR catalyst housing. The DEF injector sprays pressurized DEF in the pressure line based on the command from the DEF control module. The DEF injector has a high side circuit and a low side circuit. The high side circuit provides a battery voltage to the DEF injector from the control module internal high side driver circuit, and the DEF injector is energized by pulling the internal low side driver circuit to the ground. Both drivers are turned ON when the DEF injector is commanded ON, and both are controlled with a pulse width modulation (PWM) signal. If the DEF control module detects an open circuit or short to ground on the DEF injector circuits, this DTC will set.

Condition for Running the DTC

- The battery voltage is between 10 to 16 volts.
- The ignition switch is ON.

Condition for Setting the DTC

- The DEF control module detects an open circuit or a short to ground on the DEF injector control circuits for 3 seconds.

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.

Test Description

The number below refers to the step number on the Circuit/ System Testing.
3. If the low side circuit is shorted to ground, this DTC is set but the DEF injector works (pulses) with the DEF Injector Control test command.

Circuit / System Testing DTC P2048