22872119 | Genuine GM® DEF Supply Pump Module For 6.6L

Housing Material

Plastic

Mounting Hardware Included

No

Outlet Port Quantity

1

End 1 Terminal Type

Blade

End 2 Terminal Type

Blade

End 1 Connector Gender

Female

End 1 Terminal Quantity

2

End 3 Connector Gender

Female

End 2 Terminal Quantity

5

Classification

OE

End 2 Connector Gender

Female

End 3 Terminal Quantity

3

End 3 Terminal Type

Blade

Inlet Port Quantity

2

1. Deliver DEF to the SCR system

• The module pumps DEF from the tank to the Selective Catalytic Reduction (SCR) injector in the exhaust.

• Without the pump, DEF cannot reach the SCR system, and the emissions control process cannot occur.

2. Reduce harmful emissions

• DEF reacts with nitrogen oxides (NOx) in the SCR system to produce harmless nitrogen and water vapor.

• The pump ensures the right amount of DEF is delivered at the right time, which is essential for emissions reduction.

3. Maintain correct pressure and flow

• The module regulates fluid pressure and flow rate so the SCR system works efficiently and prevents over- or under-injection.

4. Monitor the DEF system

• Many DEF supply pump modules have sensors that measure:

  • Fluid level

  • Temperature

  • Flow/pressure

• These signals are sent to the engine control module (ECU) to alert the driver of issues or to adjust DEF dosing automatically.

5. Support emissions compliance

• Modern diesel engines must comply with strict emissions standards, such as United States Environmental Protection Agency (EPA) regulations.

• The supply pump module is essential to keep the SCR system operating correctly and avoid emissions violations.

1. DEF or SCR warning lights

• Dashboard may show “DEF System Fault,” “Check SCR System,” or low DEF warnings”, even if the tank is full.

• Sometimes the check engine light also comes on.

2. Reduced engine power (derate)

• Vehicles often limit engine power or speed when the SCR system detects a DEF delivery problem.

• This is a protective measure to prevent excessive emissions.

3. Engine or DEF fault codes

• Scan tools may show codes like:

  • P20EE / P20EF – DEF pump performance or flow issue

  • P208E – DEF delivery fault

4. DEF not being consumed

• If you refill the tank but the DEF gauge doesn’t change or fluid doesn’t seem to move, the pump may not be working.

5. Strange noises from the pump

• A failing pump can make grinding, buzzing, or whirring noises, indicating mechanical failure.

6. DEF freezing issues

• Some modules have heating elements. If these fail, DEF may freeze in cold temperatures, causing system errors.