Code Definition

P049C — EGR flow excessive Bank 2

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

About P049C

P049C 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 P049C is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

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 P049C 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 P049C is set when the Engine Control Module (ECM) detects excessive exhaust gas recirculation (EGR) flow in Bank 2 of the engine. This condition usually indicates that the EGR system is allowing more exhaust gases to re-enter the combustion process than is optimal for engine operation. The EGR system's primary function is to reduce NOx emissions by recirculating a portion of the engine's exhaust gas back to the engine cylinders. In Bank 2, excessive EGR flow can affect engine performance, fuel efficiency, and emissions.

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