Exhaust Aftertreatment Fuel Injector Performance Issue
The P2698 code indicates that the powertrain control module (PCM) has detected a performance problem 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 may be clogged, leaking, or electrically faulty, leading to improper fuel delivery and reduced emissions control efficiency.
1. Most Common Causes
- Clogged or carbonized exhaust aftertreatment fuel injector
- Internal mechanical failure of the injector (stuck solenoid valve)
- Injector wiring short circuit, open circuit, or abnormal resistance
- Corroded injector connector or damaged pins
- Faulty dosing control module (DCM)
- Inadequate fuel pressure in the aftertreatment fuel circuit
- Faulty temperature or pressure sensor affecting control strategy
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Increased exhaust emissions
- Possible DPF regeneration issues
- Engine may enter limp mode
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the injector and its wiring harness for damage or corrosion.
Step 3: Test injector resistance and actuation using a scan tool or multimeter.
Step 4: Check fuel pressure at the injector supply line.
Step 5: Perform a leak test or flow test on the injector if possible.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to DPF clogging, increased emissions, and potential engine damage. Limp mode may limit speed.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, including parts and labor, depending on the vehicle and whether the injector or wiring needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.