P0200 indicates that the engine control module (ECM) has detected an open circuit in one or more fuel injector circuits. This means the electrical path to the injector is broken, preventing the injector from opening and delivering fuel.
The injector itself may have an internal open circuit due to a broken coil winding or internal failure. This is the most common cause.
Wires to the injector may be broken, chafed, or corroded, or the connector may be loose or have bent pins, causing an open circuit.
Although rare, the ECM's internal injector driver can fail, resulting in an open circuit. This is typically a last-resort diagnosis after all other possibilities are ruled out.
A blown fuse or defective relay that supplies power to the injector circuit can cause an open circuit condition.
In very rare cases, a software glitch or hardware failure within the ECM can incorrectly report an open circuit. This is not a common cause.
Yes, a faulty injector with an internal open circuit is the most common cause of P0200. Replacing the injector usually fixes the problem.
Almost never. The ECM is rarely the cause of P0200. Most cases are due to a bad injector, wiring issue, or connector problem. Only consider ECM replacement after thoroughly testing all other components.
It is not recommended. The affected cylinder is not receiving fuel, which can cause misfiring, catalytic converter damage, and poor drivability. Have the issue diagnosed and repaired promptly.
Clearing the code will only turn off the Check Engine Light temporarily. If the underlying open circuit is not repaired, the code will return as soon as the condition is detected again.