Exhaust Aftertreatment Fuel Injector Circuit/Open
The P2697 code indicates that the Powertrain Control Module (PCM) has detected an open or high resistance in the electrical 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 increase exhaust temperature for Selective Catalytic Reduction (SCR) systems. An open circuit means the injector is not receiving power or ground, preventing it from operating and potentially leading to failed DPF regeneration, increased emissions, and possible clogging of the exhaust system.
01. Most Common Causes
- Open or shorted wiring in the injector circuit
- Faulty exhaust aftertreatment fuel injector
- Corroded or damaged connector at the injector
- Blown fuse or relay for the injector circuit
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel efficiency
- Failed DPF regeneration or frequent regeneration cycles
- Excessive exhaust smoke (black or white)
- Possible limp mode activation
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes (e.g., P2696, P2698).
Step 2: Visually inspect the injector wiring and connector for damage, corrosion, or loose connections.
Step 3: Test the injector circuit for voltage and ground using a multimeter; compare with manufacturer specifications.
Step 4: Measure the resistance of the injector itself; an open circuit indicates a faulty injector.
Step 5: Check the fuse and relay for the injector circuit; replace if blown.
Step 6: If all else is fine, test the PCM output signal; if missing, the PCM may need reprogramming or replacement.
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 clogged DPF, increased emissions, and potential engine damage. 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 is about $100-$250 depending on accessibility.