Code Definition

P046D — EGR position sensor signal intermittent sensor 1

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

About P046D

P046D is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P046D is stored, the module has detected 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 P046D 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 fault code P046D is set when the Engine Control Module (ECM) detects an intermittent signal from the first Exhaust Gas Recirculation (EGR) position sensor. This occurs when the ECM receives a signal that is erratic or not within the expected range for a given EGR valve position. The EGR position sensor's primary function is to provide feedback to the ECM regarding the actual position of the EGR valve, which is critical for ensuring optimal exhaust gas recirculation.

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