Code Definition

P049E — EGR position sensor exceeded learning limit sensor B

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

About P049E

P049E 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 P049E 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 P049E 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 P049E is set when the Engine Control Module (ECM) detects that the learning limit of the Exhaust Gas Recirculation (EGR) position sensor B has been exceeded. This situation usually indicates a problem with the sensor's ability to accurately calibrate or adapt to the position of the EGR valve over time. The EGR position sensor B is crucial for the ECM to correctly monitor the position of the EGR valve, ensuring the proper amount of exhaust gas is recirculated for efficient engine operation and emission control.

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