Code Definition

P2004 (02) — Manifold Air Pressure Signal Low

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Mercedes-Benz

About P2004

P2004 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Mercedes-Benz vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2004 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2004 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC P2004 with sub code 02 is a Mercedes Benz specific code that sets when the Engine Control Module (ECM) reads a manifold absolute pressure (MAP) sensor signal that is lower than the expected range. The MAP sensor reports intake manifold pressure to the ECM as a voltage that rises with pressure and falls under vacuum, and the ECM uses this signal to calculate engine load and control fuelling and timing. P2004 sets when the MAP signal voltage drops below the calibrated threshold for a set period, which suggests excessive vacuum, an open circuit, or a sensor or wiring fault. When this code is ...

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