Cummins Fault Code
Free · no signupFC 1922
Filter light flashes. If ignored, engine will severely derate and eventually "Lock Out."
System
Not specified
Symptom
Filter light flashes. If ignored, engine will severely derate and eventually "Lock Out."
Diagnosis & fix steps
ACTION: 1. Attempt "Parked Regen" via dash switch.
2. Check Orange 5V ref at DPF Delta sensor.
3. Inspect pressure tubes for cracks.
Red Seal field insights
Look at the DPF pressure tubes. If they are soft or have holes, the sensor gets a false reading. Replacing a $20 hose often fixes a $2,000 "failed" DPF code.
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