Exhaust Aftertreatment Fuel Injector Control Performance
The P20CC code indicates that the powertrain control module (PCM) has detected a performance issue with the exhaust aftertreatment fuel injector, which is used to inject fuel into the exhaust stream for diesel particulate filter (DPF) regeneration or selective catalytic reduction (SCR) system. This injector is critical for reducing emissions, and a malfunction can lead to incomplete regeneration, increased emissions, and potential damage to the aftertreatment system.
01. Most Common Causes
- Faulty exhaust aftertreatment fuel injector
- Wiring or connector issues in the injector circuit
- Clogged or restricted fuel supply to the injector
- PCM software or calibration error
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Increased exhaust emissions
- Possible DPF regeneration issues or warning lights
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the injector wiring and connectors for damage or corrosion.
Step 3: Test the injector resistance and voltage supply using a multimeter.
Step 4: Check fuel pressure and supply lines to the injector for blockages.
Step 5: If all else is fine, replace the exhaust aftertreatment fuel injector.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can lead to incomplete DPF regeneration, increased emissions, and potential damage to the aftertreatment system. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and part replacement, but can be higher if additional repairs are needed.