Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0201-P0204: Injector Control Circuit: Description
The fuel injection system utilizes sequential fuel injection. The PCM independently controls each fuel injector through separate internal drivers. The PCM drivers hold each fuel injector circuit to ground for a certain length of time based on engine operating parameters. The fuel control system is designed to maintain a 14.7 to 1 air/fuel ratio under all conditions except power enrichment mode (heavy acceleration/heavy engine load). The PCM calculates the current flow through each fuel injector by monitoring the voltage drop across a fixed internal resistor. The current through each driver rises to a peak of 4 amps then lowers to 1 amp to keep the injector open. This is called peak and hold. DTC P0201-P0204 sets when the PCM has detected that the injector cannot reach a calibrated peak amperage value when the fuel injector is commanded ON.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.