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2012 MERCEDES-BENZ ML
3.5L V6•AWD•AUTOMATIC•gas•M272
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Repairs0Labor492Torque2165Fluid8DTC1852Battery2Maintenance0Recalls0
P1105moderate severityPowertrain

Atmospheric Pressure Sensor in Control Module

on 2012 Mercedes-Benz ML 3.5L V6 · AWD

What this code means

The ECU detected a malfunction in its internal atmospheric (barometric) pressure sensor. This sensor provides altitude compensation data for fuel and ignition calculations and is integrated within the ECU housing.

Symptoms

  • Check Engine Light
  • Poor high-altitude performance
  • Incorrect fueling at altitude
  • Reduced power

Common causes

  • ECU internal barometric sensor failure
  • ECU exposed to moisture
  • ECU board-level defect
  • Power supply issue to ECU

Diagnostic steps

  1. Read barometric pressure value and compare to known altitude
  2. Check ECU for moisture intrusion
  3. Compare reading with external barometric source
  4. Check ECU power and ground circuits

Repair notes

If the internal sensor has failed, ECU replacement may be necessary.

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