Caterpillar Fault Code
Free · no signupSPN 177 FMI 0
Erratic shifting; Transmission slipping; "Hot oil" smell; Warning light on dash.
System
Not specified
Symptom
Erratic shifting; Transmission slipping; "Hot oil" smell; Warning light on dash.
Diagnosis & fix steps
Transmission Oil Temperature High
LOGIC: Transmission Overheating.
ACTION: Check oil level while warm. Inspect cooler for airflow blockage. Check for internal clutch slip.
FIX: Clean Trans Cooler; replace Temp Sensor; change burnt oil/filters.
Red Seal field insights
High temp is often caused by "stalling" the torque converter too long. If the oil smells burnt, the properties are gone.
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