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Rear Pumping Element

Fault Code: 328
PID: S152
SPN: 1348
FMI: 7
LAMP: Yellow
The electronic control module (ECM) has detected a malfunction in the rear pumping element.

Derate in power output of the engine.

Circuit Description

The rear pumping element consists of the rear barrel and plunger, rear pumping control valve, and rear check valve in the accumulator. These components are part of the accumulator module. The pumping element is responsible for pumping fuel into the accumulator and maintaining the desired pressure in the accumulator.

Component Location

The rear pumping element is part of the Cummins accumulator pump system (CAPS) fuel pump in the accumulator module.

Shop Talk

  • A plugged fuel filter can cause both Fault Code 275 and Fault Code 328 to be logged intermittently.
  • If Fault Code 275 and Fault Code 328 are both present, check fuel filter restriction.
  • A damaged engine harness could also cause this fault code to be active.
  • If Fault Code 273 or Fault Code 274 is active, troubleshoot it first.
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