Applies to: Mercedes-Benz GLA, GLC, C-Class, E-Class, Sprinter (2.1L CDI Diesel, 2005–2024)
Diesel Particulate Filter (DPF) issues are common on modern Mercedes-Benz diesel engines — especially for vehicles that only do short “school runs” or city driving. The DPF fails to regenerate naturally when the engine doesn’t reach high enough exhaust temperatures, leading to codes like P2463 (Diesel Particulate Filter Soot Accumulation).
In this guide, we’ll show you how to perform a manual DPF regeneration using the iCarsoft CR ULTRA P — a professional-grade OBD2 diagnostic tool that supports full DPF management, injector coding, live data, and more.
⚠️ Common Symptoms of a Blocked DPF
- Check Engine Light (CEL) or DPF warning symbol
- Loss of power or limp mode
- Excessive exhaust smoke (grey/blue haze)
- Poor fuel economy
- Diagnostic code P2463 or related EGR/boost codes
🔍 What Causes DPF Clogging?
Short-distance driving prevents the DPF from reaching the required 600°C to burn soot. Over time, this builds up inside the filter. Related faults like EGR malfunction or poor fuel combustion can accelerate clogging.
If ignored, the filter can become overloaded, forcing the ECU into limp mode and potentially damaging the turbo or EGR system.
🧰 Tools You’ll Need
- iCarsoft CR ULTRA P diagnostic tool (Bluetooth or cable mode)
- Fully charged car battery
- Outdoor space or well-ventilated area (regeneration releases fumes)
- Protective gloves and eye protection
🧭 Step-by-Step: How to Perform DPF Regeneration
Step 1: Connect the Diagnostic Tool
Plug the iCarsoft CR ULTRA P into your Mercedes’ OBD2 port and power on the ignition (engine off). Select “Intelligent Diagnosis” — the tool will automatically detect your VIN, model, and year.
Step 2: Run a Full System Scan
Before performing regeneration, run a complete vehicle scan. Confirm there are no major issues in the engine, fuel, or EGR system. These must be resolved before attempting DPF regen.
Step 3: Access DPF Regeneration Function
- From the main menu, select Special Functions → DPF Regeneration.
- Follow the on-screen prompts (turn ignition on, confirm oil level, and engine temperature).
- Ensure the soot content reading is within the permissible range (below ~400%).
Step 4: Begin the Regeneration
Start the engine. The CR ULTRA P will automatically raise RPMs and manage exhaust temperature to trigger regeneration. This process typically takes 10–20 minutes.
During this time, you’ll notice:
- Increased engine idle speed (1,800–2,200 RPM)
- Exhaust gas temperatures rising to 600–650°C
- Visible exhaust smoke as soot burns off
Step 5: Monitor the Process
Watch live data for the following parameters:
- Soot Content (%): Should gradually drop
- Exhaust Temperature (°C): Should remain stable
- DPF Differential Pressure: Should decrease toward normal
When soot content drops below ~95%, the tool will display “Regeneration Complete.”
Step 6: Clear Fault Codes
After regeneration, use the CR ULTRA P to clear all stored DTCs and reset the DPF adaptation values. This ensures the ECU recognizes the newly cleaned filter.
🚗 Real-World Example
A 2016 Mercedes GLA 2.1 Diesel failed emissions after multiple short urban trips. The owner noticed blue smoke and limp mode activation. Using the CR ULTRA P, the soot load was 400%. After performing the forced DPF regeneration, soot content dropped below 100%, power was restored, and no further codes were present.
💡 Pro Tips
- Perform DPF regeneration only when oil and coolant temperatures are within normal range.
- Keep the bonnet open to improve airflow during the process.
- If soot percentage doesn’t drop after regen, consider cleaning or replacing the DPF.
- Always perform a 15–20 minute motorway drive afterward to stabilize temperatures.
❓FAQs
What code usually indicates a clogged DPF?
P2463 – Diesel Particulate Filter Soot Accumulation. This is the most common DPF-related code on Mercedes diesels.
Can I perform regeneration while driving?
Yes, some cars can perform passive or active regeneration during highway driving. However, for heavy soot loads, a manual or forced regeneration via diagnostic tool is required.
Is it safe to do DPF regen at home?
Yes, as long as it’s done outdoors with proper ventilation. Never perform DPF regen in enclosed spaces — the process releases hot gases and fumes.
Can the iCarsoft CR ULTRA P do DPF regen on other makes?
Yes, it supports DPF regeneration for most major brands including BMW, Audi, VW, Ford, Toyota, and more.
How often should I regenerate the DPF?
Normally every 300–500 miles of highway driving, the ECU handles this automatically. Manual regen is only needed if the DPF becomes blocked or codes appear.
