P156A

DTC P156A Diesel Exhaust Fluid (DEF) Control Module System Voltage Low

Circuit Description

The DEF control module monitors the battery voltage on the battery voltage feed terminal and makes sure that the voltage stays within the proper range. If the DEF control module detects an excessively low battery voltage, this DTC will set.

Condition for Running the DTC

- The ignition switch is ON.
- The engine is running.

Condition for Setting the DTC

- The DEF control module detects that the battery voltage feed circuit is less than 10 volts for 10 seconds.

Action Taken When the DTC Sets

- Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type D.

Conditions for Clearing the DTC

- Refer to DTC Type Definitions for Conditions for Clearing the DTC - Type D.

Diagnostic Aids

- A charging system problem may set this DTC.
- A weakened battery(s) may set this DTC.

Circuit / System Testing DTC P156A