Liebherr Fault Code
Free · no signupP1188
Active Torque Derate (Max 75% Torque Cap)
System
Emissions / SCR
Symptom
Active Torque Derate (Max 75% Torque Cap)
Diagnosis & fix steps
LOGIC: SCR Aftertreatment Warning Level 2 (NOx Conversion Efficiency Low).
ACTION: Run SCR system test using Liebherr SCULI diagnostics. Inspect DEF dosing valve nozzle for urea clogging or internal solenoid failure.
Red Seal field insights
Operator Impact: Prevents engine damage and emissions non-compliance by capping maximum rotary torque, restricting full auger/Kelly bar pull.
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