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; when the difference is too high, the PCM triggers this code. Common causes include a failed regeneration process, excessive idling, short trips, or a faulty sensor.
1. Most Common Causes
- Clogged DPF due to incomplete regeneration
- Faulty differential pressure sensor
- Exhaust leak before or after DPF
- Engine oil consumption leading to ash buildup
- Faulty DPF regeneration system (e.g., injector, glow plug)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- Excessive exhaust smoke
- Regeneration frequency increased or unable to complete
3. 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: Monitor sensor voltage with a scan tool; compare to manufacturer specs.
Step 4: Perform a forced regeneration using a scan tool if DPF is moderately clogged.
Step 5: If regeneration fails, remove DPF for cleaning or replacement.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Driving short distances may be possible, but continued driving with a severely clogged DPF can cause engine damage, reduced performance, and may lead to a no-start condition. It's best to address the issue promptly.
How much does it cost to fix?▼
Costs vary: cleaning the DPF can be $200-$400, while replacement ranges from $500-$1500 including labor. Sensor replacement is typically $100-$200.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.