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P0236 is the generic OBD-II definition for Turbocharger/Supercharger Boost Sensor “A” Circuit Range/Performance. Ford lists that definition in its OBD code documentation, and Ross-Tech describes the fault as an implausible signal from the manifold pressure / boost sensor.
P2563 means the ECU/PCM has detected that the turbocharger boost control position sensor circuit is out of range or not performing as expected. On many turbo engines, this usually points to the vane position sensor / turbo actuator position feedback, especially on variable-geometry turbo systems. Ross-Tech, CarParts, and KBB all describe P2563 as a turbo boost control position sensor range/performance fault, often tied to the turbo vane position system rather than a simple boost leak alone.
P2262 is the generic OBD-II fault for “Turbocharger/Supercharger Boost Pressure Not Detected – Mechanical.” In plain English, the ECU expected to see boost rise under load, but sensor feedback showed that boost did not build as expected. Ford’s OBD code list uses the same basic definition, and multiple repair references describe it as a low-or-missing boost condition rather than a simple electrical fault.
P244B = Diesel Particulate Filter Differential Pressure Too High
👉 The ECU detects that the pressure difference across the DPF is higher than expected.
P244A = Diesel Particulate Filter Differential Pressure Too Low
👉 The ECU detects that the pressure difference across the DPF is lower than expected.
P0400 = Exhaust Gas Recirculation Flow Malfunction
👉 This is a general EGR system failure code.
P0404 = EGR Range/Performance Problem
👉 The ECU detected that the EGR valve is not operating within expected limits.
P0403 = EGR Control Circuit Malfunction
👉 This code means the engine control unit (ECU) has detected a problem in the electrical circuit that controls the EGR valve.
P0402 = Exhaust Gas Recirculation Flow Excessive Detected
This means the engine computer has detected too much exhaust gas entering the intake system.
👉 In simple terms:
The EGR valve is allowing more flow than expected, usually because it is stuck open or not controlled properly.
