Deutz Fault Code
Free · no signupCode 2-1-4 / SPN 729 FMI 3
White Exhaust Smoke / Cold No-Start
System
Ignition / Air
Symptom
White Exhaust Smoke / Cold No-Start
Diagnosis & fix steps
LOGIC: Intake Air Pre-heater Relay / Grid Heater Circuit High.
ACTION: Inspect grid heater relay contact terminals under the intake manifold. Check for short to 24V/12V battery power on control lines or a dead relay coil.
Red Seal field insights
Cold Thermal Control: Inoperative intake air grid heating prevents proper compressed air heat-up required to ignite diesel fuel during cold starts.
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