Code Definition

P2002 (02) — Throttle Pedal Position Sensor Signal Circuit Open - Sensor 1

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

About P2002

P2002 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 P2002 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and a sensor-related fault — the reported value from the named sensor is out of spec.

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 P2002 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

The Engine Control Module (ECM) on Mercedes Benz vehicles uses an electronic accelerator pedal with two redundant position sensors (sensor 1 and sensor 2) to interpret driver demand for electronic throttle control. DTC P2002 with sub code 02 (open circuit) is set when the ECM detects an open in the signal circuit for pedal position sensor 1 specifically, meaning the ECM is receiving no voltage (or an out of range idle voltage) where it expects to see a proportional signal tracking pedal travel. The two pedal sensors provide a safety cross check; with sensor 1 lost the ECM falls back on sensor ...

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