What are the common causes of P0201?

Open or shorted cylinder 1 injector wiring. Failed cylinder 1 injector. Damaged injector connector. Faulty PCM injector driver.

Measure cylinder 1 injector resistance against the other injectors. Check the connector pins and harness routing. Confirm the PCM fires the injector with a noid light or scope. Repair wiring or replace the injector. Clear the code and confirm the misfire clears.

P0201

Cylinder 1 Injector A Circuit

System: Injector circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P0201 means Cylinder 1 Injector A Circuit.

Where it lives

For P0201, the injector sits on the circuit this code reports. The description of P0201 puts it on cylinder 1.

Check these first

Open or shorted cylinder 1 injector wiring
Failed cylinder 1 injector
Damaged injector connector
Faulty PCM injector driver

What to do next

Measure cylinder 1 injector resistance against the other injectors
Check the connector pins and harness routing
Confirm the PCM fires the injector with a noid light or scope
Repair wiring or replace the injector
Clear the code and confirm the misfire clears

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

Generic SAE J2012 definition. Last updated 2026-08-30.