Liebherr Fault Code
Free · no signupP1192
DEF Light Flashing / Power Derate
System
Emissions / DEF
Symptom
DEF Light Flashing / Power Derate
Diagnosis & fix steps
LOGIC: DEF Tank Heating Valve Circuit Short to Ground.
ACTION: Measure internal coil resistance of the coolant-driven DEF tank heating valve. Check harness leads running to the DEF tank module for insulation damage.
Red Seal field insights
Cold Weather Safeguard: Prevents DEF freezing in sub-zero climates; a shorted valve forces the ECU to flag a cold-start emissions fault.
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