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Home >> Jeep >> 2019 >> Grand Cherokee Laredo, AWD, Full Time T/Case Control >> Repair and Diagnosis >> External Pages >> Different car >> Section 425 (Brake System Control Module (BSCM) - DTCS C0558-00 To P05DC-00) >> DTC Troubleshooting >> C05D4-00-Brake Master Cylinder Piston Position Sensor Calibration Not Learned >> Possible Causes
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Possible Causes

WARNING: This page is about a different car, the 2021 Jeep Grand Cherokee L. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
INSPECT BRAKE SYSTEM
HYDRAULIC PROVE OUT TEST ROUTINE NOT PERFORMED
BLEED BRAKES ROUTINE NOT PERFORMED
BRAKE SYSTEM CONTROL MODULE (BSCM)
ELECTRONIC BRAKE BOOSTER UNIT

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .