Category: Powertrain → Fuel System
Common on: All OBD-II gasoline and diesel engines
What it means (plain English)
These codes are the cylinder-specific versions of P0200.
- P0201 → Injector 1 circuit
- P0202 → Injector 2 circuit
- P0203 → Injector 3 circuit
- P0204 → Injector 4 circuit
- P0205 → Injector 5 circuit
- P0206 → Injector 6 circuit
- P0207 → Injector 7 circuit
- P0208 → Injector 8 circuit
They mean the ECM/PCM detected a fault (open, short, or abnormal resistance) in the injector control circuit for that specific cylinder. (obd-codes.com)
Symptoms you’ll notice
- Check Engine Light (MIL) on
- Rough running / misfire on the affected cylinder (repairpal.com)
- Loss of power, hesitation
- Poor idle, possible fuel economy drop
- Raw fuel smell or increased emissions
- May trigger misfire codes (P030X) for the same cylinder
Priority level
High. Because one cylinder is not fueling correctly, drivability suffers and prolonged misfire can damage the catalytic converter (gasoline) or cause aftertreatment issues (diesel).
Common causes
- Faulty injector (coil open/shorted)
- Wiring harness open/short specific to that injector
- Corroded/loose connector at the injector plug
- Poor ECM/PCM driver output for that channel (rare)
- Harness rub-through near valve covers (common on Duramax/Cummins)
How pros diagnose it
- Same process as P0200, but targeted at the specific cylinder.
- Cylinder balance test and swapping injectors between cylinders is a quick way to confirm if the fault follows the injector.
- Wiggle harness near the cylinder — many techs find intermittent opens this way. (yourmechanic.com)
Likely fixes
- Replace the faulty injector
- Repair/replace wiring or connector for that cylinder
- Clean/re-pin the injector connector
- Replace/repair ECM if driver fault is isolated (rare)