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2013 RAM 2500
6.7L I6 Cummins Diesel•4WD•AUTOMATIC•diesel•turbo
16 active safety recalls on this vehicle — view recalls
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Repairs0Labor519Torque3583Fluid10DTC1035Battery1Maintenance0Recalls16
C121Chigh severityChassis

Master Cylinder Pressure Sensor Circuit

on 2013 Ram 2500 6.7L I6 Cummins Diesel · 4WD

What this code means

The brake master cylinder pressure sensor circuit is reading out of range. This affects brake pressure monitoring used by ABS and stability control.

Symptoms

  • ABS and ESP lights on
  • Brake warning message
  • Reduced brake assist

Common causes

  • Faulty pressure sensor
  • Damaged sensor wiring
  • Corroded connector
  • Faulty ABS module

Diagnostic steps

  1. Read pressure sensor data
  2. Inspect sensor connector
  3. Check circuit continuity
  4. Replace pressure sensor if faulty
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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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