Liebherr Fault Code

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P20E8-00

Severe Power Loss. Engine derates quickly; AdBlue pump not audible.

System

Aftertreatment (SCR)

Symptom

Severe Power Loss. Engine derates quickly; AdBlue pump not audible.

Diagnosis & fix steps

Reductant (DEF) Pressure Too Low. LOGIC: The pump is running at 100% duty cycle but cannot reach the target 9-bar (130 psi) pressure.

Red Seal field insights

Pro-Tip: Check the DEF Main Filter inside the pump housing first. In dusty rig environments, the tank breather can fail, allowing grit to clog the primary filter, starving the pump.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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