OBD-II code · Powertrain (generic, extended)
P2CA4 Particulate Filter Pressure Sensor Signals Swapped A/B
The ECM detects that the particulate filter pressure sensor signals A and B are reversed - low-pressure side reads as high-pressure side and vice versa. Most likely a wiring swap during service.
Is it safe to drive with P2CA4?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor connectors A and B swapped during service
- PossibleSensors installed in wrong positions
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.2–1 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Pf Pressure Sensor A, Pf Pressure Sensor B, Wiring Harness
Related codes
- P2CA1Charge Air Cooler Coolant Pump Sense Circuit High
- P2CA2Charge Air Cooler Coolant Pump Sense Circuit Low
- P2CA3Charge Air Cooler Coolant Pump Sense Circuit Performance
- P2CA5DC/DC Converter Temperature Sensor E Circuit
- P2CA6DC/DC Converter Temperature Sensor E Circuit Low
- P2CA7DC/DC Converter Temperature Sensor E Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.