P0202 on the 6.7L Power Stroke points to an electrical fault in the fuel injector circuit for cylinder 2. On this common-rail engine the ECM drives each piezo injector precisely, so a circuit problem can cause a miss, rough running, or a stored code. Here is how to track it down.
What P0202 means
P0202 is defined as Injector Circuit/Open Cylinder 2. The 6.7L Power Stroke ECM controls each injector electrically and monitors the circuit. When it detects an open, short, or abnormal resistance on the cylinder 2 injector circuit, it sets P0202. The code identifies the electrical circuit rather than fuel delivery quality, so wiring and connectors matter as much as the injector itself.
Common causes
- Failed injector solenoid or internal open on cylinder 2
- Damaged or corroded injector connector under the valve cover
- Chafed or broken wiring in the injector harness
- Loose injector electrical terminal or valve-cover connector
- ECM driver fault for that cylinder (less common)
Symptoms
- Check engine light with stored P0202
- Misfire or rough idle
- Loss of power or hesitation
- Rough running that may come and go with temperature
- Occasional hard start
How to diagnose it
Inspect the cylinder 2 injector wiring and connector first, since valve-cover and harness connections are common failure points. Check injector circuit resistance and compare it to the other cylinders. Wiggle-testing the harness while monitoring for the code can reveal an intermittent open. If the wiring and connector are good and the injector coil is out of range, the injector is the likely fault. Rule out a rare ECM driver problem last.
How to fix it
Repair damaged wiring or a corroded connector and ensure the terminal is clean and tight, which resolves many injector circuit codes. If the injector solenoid tests open or out of range, replace the injector. After service, clear the code and confirm the circuit reads normally and the miss is gone. Because injector work on the 6.7L involves valve-cover access, address any related connector issues at the same time.
Frequently asked questions
Is P0202 the injector or the wiring?
It can be either. Inspect the connector and harness first because those are common and cheap to fix, then test the injector coil resistance.
Can P0202 cause a misfire?
Yes. If the injector on cylinder 2 is not firing due to a circuit fault, that cylinder will misfire and the engine will run rough.
Do I need to replace all injectors?
No. P0202 is a single-cylinder circuit code. Only the affected injector needs attention once the wiring is ruled out.
Need parts or a second opinion? The team at Core Diesel Parts can help you match the right components to your engine. Email sales@coredieselparts.com with your VIN and symptoms and we will point you to the correct parts.
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