P0267 on the 6.0L Power Stroke is a cylinder 3 injector circuit low fault. Like the other cylinder-specific injector codes on this engine, it comes from the fuel injection control module (FICM), which fires the HEUI injectors with high-voltage pulses through the valve cover harness. P0267 means the FICM saw the cylinder 3 control circuit reading low, pointing to a short to ground, an open, or a solenoid not drawing current correctly.
The value of a cylinder-specific code is that it narrows your search to one injector circuit. On the 6.0L that circuit runs through connectors under the valve cover that are known to suffer from oil intrusion and corrosion. P0267 is therefore most often a wiring or connector repair on cylinder 3 rather than a failed injector, though a bad solenoid is still possible and worth testing.
What P0267 means
The FICM drives the cylinder 3 injector solenoid and monitors the circuit. P0267 sets when that circuit reads low, indicating a short to ground, an open, or a solenoid that does not respond. It is an electrical code that directs you to the cylinder 3 wiring, the under-valve-cover connector, or the solenoid rather than to internal injector wear.
Common causes
- Corroded or oil-fouled under-valve-cover connector on cylinder 3
- Chafed or shorted injector wiring
- Failed cylinder 3 injector solenoid
- Low FICM operating voltage
- Damaged valve cover harness
Symptoms
- Misfire, rough idle, or a dead-cylinder feel
- Reduced power and hesitation
- Hard starting when hot
- Check engine light with P0267 stored
- Smoke from unburned fuel on that cylinder
How to diagnose it
Confirm FICM operating voltage with a scan tool, then run an injector buzz test and note whether cylinder 3 responds. Silence on cylinder 3 points to the circuit or solenoid. Inspect the valve cover harness and the under-valve-cover connector for oil, corrosion, and cracked insulation. Measure the cylinder 3 solenoid resistance and check the wiring from the FICM for a short to ground or an open. Reseat the connector and confirm clean pins.
How to fix it
Repair shorted or chafed wiring and clean or replace a corroded under-valve-cover connector first, since these fix most single-cylinder injector faults. Address low FICM voltage by repairing power and grounds or replacing a weak FICM. If the wiring and FICM check good but cylinder 3 fails testing, replace that injector. After the repair, clear the code, confirm cylinder 3 responds in a buzz test, and road test. For harnesses, connectors, and injectors for your 6.0L, contact sales@coredieselparts.com.
Frequently asked questions
Does P0267 always mean a bad injector?
No. It is an electrical circuit code. Check the valve cover harness, the under-valve-cover connector, and FICM voltage before replacing the cylinder 3 injector.
How do I confirm cylinder 3 is not firing?
An injector buzz test isolates each cylinder. If cylinder 3 does not click, the circuit or solenoid is at fault, which matches the P0267 code.
Can multiple injector codes share one cause?
Yes. Low FICM voltage or a common connector problem can set several cylinder-specific codes at once, so check those shared items first.
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