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P0205

Cylinder 5 Injector A Circuit.

  • Generic
  • Powertrain
  • Generic code
  • Medium severity

How this code is built

P
SystemPowertrain
0
Defined bySAE, the same on every car
2
AreaFuel and air metering (injector circuit)
05
FaultThe specific fault in that area

What it means

P0205 is the generic code for a fault in the control circuit of the cylinder 5 fuel injector. The engine control unit monitors the injector driver circuit and sets the code when the electrical signal does not match what it expects, such as an open circuit, a short to earth or to voltage, or abnormal resistance. It only applies to engines with at least five cylinders, and the exact injector circuit layout depends on the engine.

Symptoms

  • Engine misfire or rough running, particularly at idle
  • Malfunction indicator lamp on
  • Noticeable loss of power or hesitation under load
  • Hard starting or extended cranking
  • Smell of unburnt fuel or increased fuel consumption
  • Engine may run in a reduced-power mode

Possible causes

  • Damaged, chafed or corroded wiring between the engine control unit and the cylinder 5 injectorlikely
  • Poor connection or corroded terminals at the cylinder 5 injector pluglikely
  • Faulty cylinder 5 injector with an open or shorted coil or incorrect resistancelikely
  • Loose, corroded or damaged connector at the engine control unit or a harness fault elsewhere in the loompossible
  • Blown fuse or fault in the injector power supply or relay feed (design dependent)possible
  • Internal injector driver fault in the engine control unitrare

How to diagnose

  1. Read all stored and pending codes and note the freeze frame data, then check for other injector or misfire codes on neighbouring cylinders.
  2. Visually inspect the cylinder 5 injector connector and the harness for heat damage, chafing, oil contamination, bent pins and corrosion.
  3. Check the relevant fuses and the injector power supply feed against the wiring diagram for your model and engine.
  4. Wiggle-test the harness and connector with the engine running or the live data monitored to see if the fault appears or the misfire changes.
  5. Measure the injector coil resistance and compare it with the manufacturer specification for that engine.
  6. Check the supply voltage and earth or driver signal at the injector connector, using the wiring diagram to identify the pins.
  7. Swap the cylinder 5 injector with another cylinder (where the design allows) and see whether the fault follows the injector or stays on cylinder 5.
  8. Check wiring continuity and insulation between the injector connector and the engine control unit connector, with the battery disconnected.

How to fix

  • Repair or replace damaged wiring, using proper soldered and sealed joints or a new section of harness.
  • Clean or replace the corroded or damaged injector connector and terminals.
  • Replace the faulty cylinder 5 injector and carry out any adaptation or coding the manufacturer requires.
  • Restore the injector power feed by replacing a blown fuse after finding the cause, or by repairing the relay or supply fault.
  • Repair or replace the engine control unit only after all wiring and the injector have been proven good.

Can I keep driving?

Medium severity

The car can usually be driven carefully for a short time, but an injector that is not working properly can cause misfires and unburnt fuel reaching the catalytic converter. Have it checked soon and avoid heavy loads or long journeys.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

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