P0205
Injector Circuit/Open - Cylinder 5
Encountering the engine check light code P0205 signifies an explicit mechanical or electrical operational breakdown categorized as "Injector Circuit/Open - Cylinder 5". Professional scanner tools usually flag this subsystem loop early on.
Driver's Summary
Code P0205 means your vehicle detected a problem with the injector circuit/open - cylinder 5 system. Drivers typically experience rough idle, severe hesitation, check engine light when this code is active. This condition is classified as high severity. Prompt diagnosis is essential to prevent cascading damage to related components.
Symptoms
Rough idle, severe hesitation, check engine light
Common Causes
- Failed injector coil internally
- Damaged connector plug
- Wiring shorted to ground
- Bad PCM
How to Fix
- 1 Measure injector resistance and replace if out of spec
- 2 Replace connector pigtail
- 3 Fix shorted wiring
- 4 Test PCM with diagnostic tool
Technical Explanation
Detection of P0205 occurs when the ECM cross-references multiple sensor inputs and determines that the reported values are physically inconsistent or out-of-range. Misfire rate is counted per cylinder over rolling windows and compared against two thresholds: a catalyst-damaging rate (triggers flashing MIL) and an emissions-exceeding rate (triggers solid MIL). The PCM logs which cylinder is misfiring based on crankshaft position at the time of each detected event. The fault remains stored in memory even after the MIL is cleared; it becomes a confirmed DTC after failing two consecutive drive cycles, and the PCM logs a freeze frame record of the engine's exact operating state at the moment of detection.
Is It Safe to Drive?
With P0205 active, your engine or transmission is not operating within design parameters. Short-term driving may seem fine, but internal damage is accumulating — particularly to failed injector coil internally.
Mechanic's Pro Tip
Before replacing any component on P0205, spend 5 minutes inspecting the wiring harness and connector first — corrosion, chafed insulation, and backed-out pins cause the majority of these faults and cost nothing to fix. Use a multimeter to measure voltage drop across the connector pins under load; anything above 0.1V indicates excessive resistance that will cause intermittent failures even after replacing the sensor.
Pigtail and labor: $100 - $150; Injector: $150 - $400