DPF Pressure Sensor Circuit High
The P2455 code indicates that the Diesel Particulate Filter (DPF) pressure sensor circuit is reading a voltage higher than the expected range. This sensor monitors exhaust backpressure before and after the DPF to determine soot load. A high circuit signal can be caused by a faulty sensor, wiring issues (short to voltage), or a blocked DPF. If left unresolved, it may lead to reduced engine performance, increased emissions, and potential DPF damage.
01. Most Common Causes
- Faulty DPF pressure sensor
- Short to voltage in sensor wiring or connector
- Blocked or clogged Diesel Particulate Filter
- Exhaust system leaks or restrictions
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- Excessive exhaust smoke
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check freeze frame data.
Step 2: Inspect the DPF pressure sensor and wiring for damage, corrosion, or shorts.
Step 3: Measure sensor voltage with key on engine off; compare to manufacturer specs (typically 0.5-4.5V).
Step 4: Check exhaust backpressure using a gauge to determine if DPF is clogged.
Step 5: If sensor and wiring are okay, test the DPF pressure sensor by applying vacuum and monitoring voltage change.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to DPF damage and reduced performance. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Repair costs range from $150 to $400, depending on whether the sensor needs replacement ($50-$150) or if the DPF requires cleaning or replacement (up to $1000+).