Detroit Diesel Fault Code
Free · no signupSPN 1215 (FMI 10)
Engine Surge / Limp Mode.
System
Fuel System
Symptom
Engine Surge / Limp Mode.
Diagnosis & fix steps
LOGIC: Fuel Rail Pressure - Change Rate Abnormal.
ACTION: Check for a restricted fuel supply (dirty filters) or a failing Quantity Control Valve (QCV).
Red Seal field insights
Specs: The MCM (Motor Control Module) expects a smooth pressure rise.
RED SEAL FIX: If you've been using high-biofuel blends, the QCV plunger can get "sticky," causing the pressure to jump rather than glide.
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