P1264 Cylinder 4 High to Low Side Short

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: F-250/F-350 Super Duty with 7.3L Power Stroke

What does P1264 mean on a Ford?

P1264 — Cylinder 4 High to Low Side Short. This Ford-enhanced code applies to F-250/F-350 Super Duty with 7.3L Power Stroke.

Common causes of P1264

Shorted cylinder 4 injector
Chafed harness
Connector short
Oil contamination
IDM fault

How to fix P1264

Buzz test cylinder 4
Inspect under-cover wiring
Test injector resistance
Check the gasket connector
Repair or replace per results