What it means
The ECM detects a circuit intermittent/erratic fault on the particulate filter pressure sensor c. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Particulate filter pressure sensor C supplies pressure data that the control module uses to estimate filter loading and manage regeneration. This code sets when sensor C’s circuit signal is unstable or erratic, often because a connector or ground loses contact intermittently.
Common causes
Most likely first.
- Sensor connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
How to diagnose it
- Save freeze-frame data and review sensor C live data for sudden jumps or dropouts, noting engine speed and vibration conditions when they occur.
- Inspect sensor C’s connector seating, terminal tension, wiring support, and ground connection for looseness, corrosion, or movement.
- With live data displayed, gently move the sensor C harness and connector to see whether the signal changes when the fault is reproduced.
- Check the sensor C signal, supply, and ground circuits for intermittent opens or resistance changes using the manufacturer’s procedure.
- If the wiring remains stable, test sensor C for an intermittent internal fault under the conditions recorded in the freeze frame.
Common fixes
- Reseat and lock the sensor C connector, securing the harness so vibration cannot pull on it.
- Clean or replace corroded or loose terminals in the sensor C connector.
- Repair damaged wiring or a poor ground that causes the signal to drop out.
- Replace sensor C if its signal remains erratic with a stable, verified circuit.
Can I keep driving?
If the fault causes intermittent power loss or a DPF warning, avoid long or high-load trips until the signal is stable. Unreliable pressure data can interrupt regeneration and let filter loading worsen.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.