P0200 - Injector Circuit Malfunction

P0200 is a fuel injector circuit fault. Prove connector, power feed, control circuit, injector coil, and PCM driver behavior before replacing the injector.

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Code Overview

P0200 is a fuel injector circuit fault. Prove connector, power feed, control circuit, injector coil, and PCM driver behavior before replacing the injector.

Common Causes

• Injector connector loose, corroded, oil soaked, or terminal tension poor
• Open, shorted, or high-resistance injector control or power circuit
• Injector coil resistance out of range or injector mechanically stuck
• PCM driver fault after circuit, power, ground, and injector checks pass
• Harness damage from heat, vibration, rodents, or previous engine work

Symptoms

• Rough idle
• Cylinder misfire
• Fuel smell or lean/rich trim shift
• Hard starting
• Reduced power

Diagnostic Steps

1. Confirm the affected cylinder and compare with misfire counters and fuel-trim data
2. Inspect injector connector fit, terminals, harness routing, and shared power feed
3. Use a noid light, scope, or scan data to verify injector command where appropriate
4. Measure injector resistance and compare with matching injectors on the same engine
5. Check power feed, control-side voltage drop, shorts to power/ground, and continuity before replacing the injector
6. Verify repair with smooth idle, no misfire counters, and no pending injector circuit code

Repair Difficulty

Moderate

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