P0267

P0267 sets when the cylinder 3 injector control circuit reports current below the expected threshold during ECM commanded pulse-width, indicating a short to ground in the injector low-side circuit, a shorted injector winding, or a failed ECM injector driver channel. Cheapest first: with key off, unplug the cylinder 3 injector and measure resistance across the injector pins — 11-17 ohms is normal for saturated-driver high-impedance injectors, 1.5-4 ohms for peak-and-hold low-impedance; readings well below the low end confirm a shorted winding. Inspect the harness from the connector along its full routing — cylinder 3 sits in a position where the harness frequently crosses fuel rail brackets or EGR plumbing and is prone to chafe-through to ground. Confirm the 12 V supply on the injector feed side (should be battery voltage with key on if non-cycled, or pulsed if injector relay is cycled) and verify the ECM is still driving the low side with a noid light. Caveat: a recent timing chain or head gasket service that disturbed the injector harness is a common precursor to P0267 — inspect for pinch points under intake manifold reinstallation before assuming a sensor or injector fault.

Vehicle-specific patterns: 2007-2013 GM 5.3L (LMG/LC9) — recurring intake-harness chafe pattern on cylinder 3, harness repair plus loom; full injector swap only if ohms confirm short. 2005-2010 Ford F-150 5.4L 3V — cylinder 3 injector connector pin corrosion from valve cover oil seep, clean and replace pigtail. 2006-2012 Toyota 4Runner/Tacoma 4.0L (1GR-FE) — internal injector short under TSB EG028-09, replace 23250-31020. 2007-2013 Dodge Ram 5.7L Hemi — cylinder 3 injector winding short from prolonged ethanol exposure (E10 fuel quality), replace 05037479AA and recommend Top Tier fuel. Estimated repair: $80 to $620.