P0295 Cylinder 12 Injector Circuit High

P0295 points to a high injector circuit on cylinder 12. The injector 12 circuit is open, shorted to voltage, or above expected range.

Code details

Generic OBD-II · P0

System: Injector
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not assume injector 12 is mechanically failed until the high circuit is electrically isolated.

Symptoms of P0295

Check-engine light, often with a misfire feel from one cylinder.
Rough idle, hesitation, or a slight loss of power.
Higher fuel use, or in some cases a fuel smell.

Common causes of P0295

A stuck, leaking, clogged, or electrically failed injector.
Injector wiring, connector, or driver-circuit faults.
Low fuel pressure or contamination affecting injector behaviour.

Useful checks before replacing parts

Check injector 12 signal voltage, feed supply, ground control, open circuits, short-to-voltage faults, and injector resistance.
Compare cylinder 12 balance, misfire, contribution, and injector command with nearby cylinders under similar load.
Inspect terminal fit, connector corrosion, harness heat damage, water intrusion, and controller driver behavior during loaded testing.

Related OBD-II codes

These nearby injector entries can help compare wording and pin down the fault area.