Cummins Fault Code

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Cummins 112/113/114 (635)

Turbo Lag / Low Boost.

System

Turbo

Symptom

Turbo Lag / Low Boost.

Diagnosis & fix steps

LOGIC: VGT (Variable Geometry Turbo) Actuator - Short/Open. ACTION: Check the 4-pin VGT plug for corrosion. Perform an "Actuator Hysteresis Test."

Red Seal field insights

RED SEAL FIX: 113 (High) / 114 (Low). If the actuator is stuck, you can sometimes "free it" by hand, but usually, the internal gears are stripped.

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