Exhaust Aftertreatment Fuel Injector Control Performance
The P20D2 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 heating. This fault typically arises when the injector's actual operation does not match the commanded state, often due to electrical faults, mechanical sticking, or contamination. If left unaddressed, it 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 (open, short, or corrosion)
- Contaminated fuel or injector clogging
- 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 frequent regen cycles
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the injector wiring and connectors for damage or corrosion.
Step 3: Test the injector resistance and actuation using a scan tool or multimeter.
Step 4: Check fuel quality and replace if contaminated.
Step 5: If all else fails, replace the exhaust aftertreatment fuel injector and clear codes.
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 $150 to $400, including parts and labor. The injector itself costs $50-$150, and labor adds $100-$250 depending on the vehicle and shop rates.