DPF Regeneration Lamp Control Circuit Malfunction
The P260E code indicates a fault in the control circuit for the diesel particulate filter (DPF) regeneration lamp. This lamp illuminates on the dashboard to inform the driver that the DPF is undergoing active regeneration. When the circuit fails, the lamp may not light up during regeneration, or it may stay on continuously, preventing proper regeneration and leading to DPF clogging. The issue is often caused by a faulty lamp, damaged wiring, or a defective powertrain control module (PCM).
01. Most Common Causes
- Faulty DPF regeneration lamp bulb or LED
- Open or short circuit in the lamp wiring or connector
- Blown fuse or relay for the regeneration lamp circuit
- Defective powertrain control module (PCM)
02. Symptoms You Will Notice
- DPF regeneration lamp does not illuminate when regeneration is active
- DPF regeneration lamp stays on continuously or flashes
- Check Engine Light (MIL) illuminated
- Reduced engine performance and fuel economy due to clogged DPF
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data. Verify P260E is present.
Step 2: Visually inspect the DPF regeneration lamp bulb/LED and replace if burned out.
Step 3: Check the wiring and connector for damage, corrosion, or loose connections. Repair as needed.
Step 4: Test the fuse and relay for the regeneration lamp circuit. Replace if blown or faulty.
Step 5: If all else is okay, test the PCM output to the lamp circuit. Replace PCM if no output is detected.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive for extended periods because the DPF may not regenerate properly, leading to clogging and potential engine damage. However, short trips to a repair shop are generally safe.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts and labor. Replacing a bulb or fuse is inexpensive, but PCM replacement can be more costly.