P0272 — Cylinder 4 Injector Circuit High
Drive with caution — fix soon.
What P0272 means
This code means the computer detected an abnormally high voltage in the wiring or circuit that controls cylinder 4's fuel injector. It usually points to a wiring fault, a bad connector, or a failing injector that isn't switching on and off properly. It's often fixable by repairing the circuit or replacing the injector, without major engine work.
Common symptoms
- Check engine light is on
- Rough idle or engine shaking
- Noticeable loss of power
- Engine misfire or hesitation
- Increased fuel consumption or rough running
Common causes
- Faulty or open injector wiring for cylinder 4
- Corroded or loose injector connector
- Failed fuel injector on cylinder 4
- Short to power in the injector circuit
- Faulty engine control module (ECM) driver
Typical repair cost
$120 – $450
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0272 code?
For short trips, usually yes, but you shouldn't rely on it. The affected cylinder may run poorly and cause rough idling or lost power. Have it checked soon to prevent further fuel system or engine damage.
How much does it cost to fix a P0272 code?
Repairs typically range from about $120 to $450. A simple wiring or connector fix is on the lower end, while replacing the injector costs more, especially with diagnostic labor.
Is a P0272 code serious?
It's a moderate concern. The car will usually run, but a misfiring cylinder can hurt fuel economy and stress the engine. It's best to address it before the problem worsens.
What does the injector circuit high reading mean for cylinder 4?
It means the computer sees too much voltage in the injector control circuit, suggesting an open or shorted wire or a faulty injector. The injector may not be firing properly, so that cylinder isn't getting the right fuel.