Exhaust Aftertreatment Fuel Injector Stuck Closed
The P20D0 code indicates that the exhaust aftertreatment fuel injector, which injects fuel into the exhaust stream to regenerate the diesel particulate filter (DPF), is stuck in the closed position. This prevents fuel from being injected, leading to incomplete DPF regeneration and potential clogging of the filter. The issue is commonly caused by carbon buildup, electrical faults, or mechanical failure of the injector.
01. Most Common Causes
- Carbon buildup on the injector tip
- Faulty injector solenoid or wiring
- Failed injector due to mechanical wear
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy and engine performance
- Frequent DPF regeneration cycles or clogged DPF
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P20D0 is present.
Step 2: Inspect the aftertreatment fuel injector wiring and connector for damage or corrosion.
Step 3: Test the injector resistance with a multimeter; compare to manufacturer specs.
Step 4: Remove and inspect the injector for carbon buildup or mechanical sticking.
Step 5: If injector is stuck, attempt cleaning with a specialized cleaner; if not, replace the injector.
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 as it can lead to a clogged DPF and costly repairs. Short trips may be possible, but the issue should be addressed promptly.
How much does it cost to fix?▼
The cost to replace the aftertreatment fuel injector typically ranges from $50 to $150 for the part, plus labor if done by a shop. DIY replacement can save on labor costs.