DPF Differential Pressure Too High Bank 1
The P244B code indicates that the diesel particulate filter (DPF) differential pressure sensor is reading a pressure drop across the DPF that is higher than the expected range. This typically means the DPF is clogged with soot or ash, restricting exhaust flow. The sensor measures exhaust pressure before and after the DPF; a high differential indicates excessive backpressure. This can be caused by incomplete regeneration, excessive idling, or failed components.
01. Most Common Causes
- Clogged DPF due to incomplete regeneration
- Faulty differential pressure sensor
- Exhaust leak before or after the DPF
- Engine mechanical issues (e.g., turbocharger, EGR)
02. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine power and acceleration
- Poor fuel economy
- Excessive exhaust smoke
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect DPF differential pressure sensor and hoses for damage or blockage.
Step 3: Perform a forced regeneration using a scan tool to clear the DPF.
Step 4: If regeneration fails, remove and clean or replace the DPF.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Driving short distances may be possible, but continued driving can lead to severe DPF damage and costly repairs. It's best to address the issue promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. If the DPF needs replacement, costs can range from $1,000 to $4,000 depending on the vehicle.