P0200: Reports an injector-circuit fault, including an open-circuit condition.
Meaning, symptoms, causes and checks
Reports an injector-circuit fault, including an open-circuit condition. This base definition does not select a specific cylinder or prove a mechanical injector failure.
Affected system: Powertrain
Symptoms
- Rough idle, misfire or vibration if cylinder injection is interrupted.
- Engine warning lamp; reduced power or hard starting depending on affected cylinders.
Possible causes
- Loose connector, damaged terminals or open/shorted wiring for the injectors.
- Injector electrical fault or, less commonly, driver fault; a shared supply problem can affect multiple cylinders.
What to check
- Confirm cylinder numbering and injector type; identify the circuit for the injectors on the diagram rather than assuming location.
- Save codes and failure conditions; if several injectors are affected, check shared supplies/connections first.
- Inspect connector and wiring for the injectors, including terminal retention and vibration/chafing areas.
- With power off and modules isolated as instructed, test for opens and shorts between injector and ECU.
- Test injector and command waveform using compatible equipment and OEM limits; do not apply battery voltage directly, then verify the repair.
Also written as: P0200-00, P020000, PO200 (some scan tools add the fault-type byte, e.g. -00).