Injector Circuit Malfunction
What does P0200 mean?
The P0200 code means the vehicle's onboard diagnostic system has detected: Injector Circuit Malfunction. This is a serious severity code.
Common Symptoms
- Check Engine Light on
- Engine misfire
- Rough idle
- Loss of power
- Fuel smell
Probable Causes (Ranked by Likelihood)
- Open or short in injector wiring harness Very High
- Faulty injector driver in PCM High
- Damaged injector connector High
- Failed fuel injector Moderate
Step-by-Step Diagnostic Procedure
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Check for cylinder-specific injector codes (P0201-P0208). If a specific cylinder code accompanies P0200, focus diagnosis there.
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Measure injector resistance: most are 11-17 ohms (high-impedance) or 2-4 ohms (low-impedance).
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Check injector connector for corrosion or broken locks.
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Perform injector balance test with a scan tool.
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Check PCM injector driver with a NOID light: a bright flashing light confirms the driver is working.
Frequently Asked Questions
What is a NOID light and how do I use it?
A NOID light is a small test light that plugs into the injector harness connector. When cranking or running, it flashes if the PCM is sending pulses to the injector. No flash means a wiring or PCM problem; flash with no injection means the injector itself is faulty.