Exhaust Aftertreatment Fuel Injector Stuck Closed
The P20D6 code indicates that the exhaust aftertreatment fuel injector, used to inject fuel into the exhaust stream for diesel particulate filter (DPF) regeneration, is stuck in the closed position. This prevents proper regeneration, leading to soot buildup in the DPF and potential exhaust system damage.
1. Most Common Causes
- Faulty aftertreatment fuel injector
- Wiring or connector issues in the injector circuit
- Clogged injector due to carbon deposits
- ECM software or control module failure
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance and fuel economy
- DPF regeneration failure or frequent regeneration attempts
- Excessive exhaust smoke or odor
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the injector and wiring for damage or corrosion.
Step 3: Test injector resistance and actuation using a scan tool.
Step 4: Check fuel pressure and supply to the injector.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the DPF may clog, leading to costly repairs. Short trips may be possible but avoid prolonged driving.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and injector replacement, but can be higher if the DPF needs cleaning or replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.