Exhaust Aftertreatment Fuel Injector Circuit High
The P269A code indicates that the powertrain control module (PCM) has detected a voltage or resistance higher than expected in the circuit of the exhaust aftertreatment fuel injector. This injector is used in diesel engines to introduce fuel into the exhaust stream for regeneration of the diesel particulate filter (DPF) or to raise exhaust temperature for selective catalytic reduction (SCR) systems. A high circuit condition typically points to a short to voltage, open circuit, or a faulty injector or wiring.
01. Most Common Causes
- Faulty exhaust aftertreatment fuel injector
- Short to voltage in the injector circuit wiring
- Open or high resistance in the injector circuit
- Damaged connector or corroded terminals
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel efficiency
- DPF regeneration issues or frequent regeneration cycles
- Possible limp mode or reduced engine power
- Excessive exhaust smoke
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the injector wiring and connector for damage, corrosion, or loose pins.
Step 3: Measure resistance of the injector and compare to manufacturer specifications (typically 0.5-2 ohms).
Step 4: Check for voltage at the injector connector with key on; should be battery voltage or a specific reference voltage.
Step 5: If wiring and injector are okay, test the PCM output circuit for shorts or opens using a multimeter.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to incomplete DPF regeneration, increased emissions, and potential damage to the exhaust aftertreatment system. You may experience reduced performance and fuel economy.
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 is about $100-$250 depending on the vehicle and shop rates.