Code Definition

P245C — Exhaust Gas Recirculation Cooler Bypass Control Circuit Low

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

About P245C

P245C 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 P245C 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 P245C 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

This code applies to diesel engines fitted with a cooled exhaust gas recirculation system, where a bypass valve routes recirculated exhaust either through the EGR cooler or around it. The engine control module closes the bypass during warm up and light load so the exhaust gas stays hot, which speeds cabin heat, reduces condensation and limits soot fouling inside the cooler core, then opens the cooler path at higher load to drop intake charge temperature and control oxides of nitrogen. The bypass valve is driven either by an electric actuator or by a vacuum or electric solenoid, and the module ...

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