What does Cummins fault code 259 mean?

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FuelCummins Diesel ECM

Fault Code 259

Fuel delivery, injector, and rail pressure faults.

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System

Cummins Fuel

Cummins ECM Service

Diagnostic Overview

Cummins fault code 259 commonly relates to fuel system pressure, fuel delivery, or sensor performance depending on engine family. The ECM may detect that fuel pressure is not matching commanded operation. Causes include restricted fuel filters, weak lift pump, air in fuel, suction restriction, contaminated fuel, failed fuel pressure sensor, pressure regulator issues, or high-pressure fuel system problems. Diagnosis should begin with fuel filter condition, fuel quality, low-side supply pressure, air-in-fuel checks, and commanded versus actual fuel pressure.

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Related Fuel Fault Codes

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118

Cummins fault code 118 is commonly related to coolant temperature signal issues, depending on engine family and calibration.

119

Cummins fault code 119 is commonly associated with coolant temperature sensor rationality or signal range issues.

268

Cummins fault code 268 generally points to fuel delivery, fuel pressure control, or injector-related performance.

271

Cummins fault code 271 is commonly associated with an injector circuit or injector performance concern.

272

Cummins fault code 272 commonly points to an injector circuit or injector performance fault.

428

Cummins fault code 428 is commonly related to water-in-fuel detection or fuel quality monitoring.

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