The control module detected a fault associated with the Particulate Filter Pressure Sensor Signals Swapped A/B circuit or function; the stored code identifies the affected component rather than a single failure mode.
Symptoms
MIL or DPF warning illuminated
Possible reduced power or limp mode
Possible frequent regeneration attempts
Possible causes
Excessive soot load beyond regeneration limits
Differential pressure sensor or hose fault
Failed or interrupted regenerations (short trips)
Exhaust leak upstream of the sensor
Underlying engine fault increasing soot output
Recommended checks
Read soot load, ash load and differential pressure values
Check differential pressure sensor and hoses
Verify exhaust gas temperature sensor readings
Check for related injection, EGR or boost codes
Verify regeneration conditions can be met (trip profile)
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
CA4
Specific fault index within the subsystem.
Frequently asked questions about P2CA4
What does P2CA4 mean?
Particulate Filter Pressure Sensor Signals Swapped A/B. The control module detected a fault associated with the Particulate Filter Pressure Sensor Signals Swapped A/B circuit or function; the stored code identifies the affected component rather than a single failure mode.
Is P2CA4 generic or manufacturer-specific?
P2CA4 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P2CA4 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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