Inactive Injector Fault or Faulty Module

This code means the computer thinks there's a problem with one of the fuel injectors, which are responsible for spraying fuel into the engine. If an injector isn't working right, it can lead to poor engine performance, rough idle, or increased emissions.

The ECM monitors the performance of each fuel injector. It expects a certain response based on the injector's duty cycle and the overall fuel trim. If an injector doesn't activate within a specific time frame (usually less than 2 milliseconds) or shows a resistance outside the expected range (typically 12-16 ohms), it triggers this code.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 1Check the wiring and connectors to the injector for frays, corrosion, or looseness. Connectors should be secure, and wiring should not be damaged. Decision: If wiring/connectors are damaged, repair/replace them and then retest.
2. 2Test the fuel injector resistance with a multimeter. Expected value is between 12-16 ohms. Decision: If out of range, replace the faulty injector.
3. 3Check fuel pressure at the rail. Expected value is typically 40-60 psi for most systems. Decision: If fuel pressure is low, diagnose fuel pump or filter issues.
4. 4Inspect and clean the fuel filter if it’s clogged. Decision: If filter is clogged, replace it and clear the code, then retest.
5. 5Use a scan tool to monitor injector performance while running the engine. Decision: If the injector doesn’t activate as expected based on duty cycle and the problem persists across multiple tests, replace the injector.

• Faulty fuel injector
• Open or shorted injector wiring
• Faulty engine control module (ECM)
• Clogged fuel filter
• Incorrect fuel pressure

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