Detroit DD15 EPA07 (2007-09) Fault Code: SPN 5444 FMI 1 (MCM) Engine Crankcase Breather Oil Separator Speed Too Low
NOTE: Please see the step by step troubleshooting procedures for this specific code.
PROBABLE CAUSES:
1. Oil leak at the crankcase oil separator vent.
2. Crankcase breather speed sensor connector/harness.
3. Crankcase breather speed sensor.
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Allison Transmission – WTEC 2 MD/HD/B SERIES TRANSMISSIONS
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