P0201: Injector Circuit/Open - Cylinder 1

Common causes

• A failed fuel injector coil
• A broken wire or loose connector at the injector
• A blown fuse or a problem in the injector power supply
• A fault in the engine computer's injector driver (less common)

Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.

Symptoms

• Check engine light
• Misfire in cylinder 1 (often with P0301)
• Rough idle and lost power
• Poor fuel economy

Is it safe to drive?

Limit driving. A cylinder without fuel misfires, which can damage the catalytic converter.

How to check it with a scanner

1. Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
2. Inspect the injector connector for corrosion or a loose lock.
3. With the engine off, measure the injector's resistance and compare it to the spec for your vehicle.
4. A noid light can confirm whether the computer is pulsing the injector.
5. After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.

A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.

Questions

Related codes

• P0301: Misfire in cylinder 1
• P0300: Random or multiple cylinder misfire
• P0171: Engine running lean, bank 1
• All trouble codes
• How to choose a car diagnostic scanner