P0268 — Cylinder 3 Injector A Circuit High

The injector A electrical monitor for cylinder 3 detects a high condition. This does not establish excessive flow; some drivers use it for a short between control stages.

Affected system: Powertrain

Symptoms

• Rough idle, misfire or vibration if cylinder injection is interrupted.
• Engine warning lamp; reduced power or hard starting depending on affected cylinders.

Possible causes

• Loose connector, damaged terminals or open/shorted wiring for cylinder 3.
• Injector electrical fault or, less commonly, driver fault; a shared supply problem can affect multiple cylinders.

What to check

• Confirm cylinder numbering and injector type; identify the circuit for cylinder 3 on the diagram rather than assuming location.
• Save codes and failure conditions; if several injectors are affected, check shared supplies/connections first.
• Inspect connector and wiring for cylinder 3, including terminal retention and vibration/chafing areas.
• Test wiring insulation between conductors and to supply as specified; high does not prove an injector stuck open.
• Test injector and command waveform using compatible equipment and OEM limits; do not apply battery voltage directly, then verify the repair.

Also written as: P0268-00, P026800, PO268 (some scan tools add the fault-type byte, e.g. -00).