Code Definition

P2426 — Exhaust Gas Recirculation Cooling Valve Control Circuit Low

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

About P2426

P2426 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 P2426 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 P2426 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 is specific to diesel engines that use a cooled exhaust gas recirculation system, where a solenoid operated valve controls whether recirculated exhaust gas is routed through the EGR cooler core. Cooling the recirculated gas lowers combustion temperature and is central to the engine meeting its oxides of nitrogen target, but the cooler must be bypassed during warm up so the engine reaches operating temperature quickly and the core does not fill with condensate and soot. The engine control module drives the cooling valve solenoid on a low side output and monitors the voltage on that ci...

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