Common Symptoms
- Check engine light illuminated
- Rough idle or engine misfire
- Reduced engine power and hesitation
- Poor fuel economy
- Engine may run on reduced cylinders
- Difficulty starting or extended cranking
Most Likely Root Causes
- Faulty fuel injector on cylinder 2
- Damaged or corroded injector wiring harness
- Failed injector driver circuit in ECM
- Shorted injector connector or terminals
- Open circuit in injector control wiring
Full step-by-step tests, DVOM guidance, and pinout data are available inside the AI Diesel Tech diagnostic session.
AI walks you through every test — one step at a time. Plans start at $12.95/mo.
Component Location
Cylinder 2 fuel injector is located on the intake side of cylinder 2, typically second from the front on inline engines or per manufacturer firing order.
Manufacturer Notes
Some manufacturers use high-impedance or low-impedance injectors which require different diagnostic approaches for circuit testing.
Also diagnosing J1939 SPN/FMI codes?
Heavy-duty trucks often throw both OBD-II and J1939 faults simultaneously. AI Diesel Tech handles both protocols in a single guided session.
AI Diesel Tech — The Technician's Diagnostic Engine
AI Diesel Tech diagnostic logic is built by an ASE Certified Diesel Technician. Professional-grade OBD-II and J1939 fault analysis — trusted by technicians nationwide, used in shops, fleets, and training programs.
Get AI-Guided Diagnosis for P0264
The diagnostic engine walks you through every physical test — step by step, on your phone, at the truck.