P0265
Cylinder 2 Injector Circuit High
If your vehicle's onboard computer has flagged the diagnostic trouble code P0265, it refers to a detected anomaly regarding "Cylinder 2 Injector Circuit High". This systemic engine fault needs a targeted check before symptoms expand.
Driver's Summary
When your OBD2 scanner shows P0265, the engine control module has flagged an issue specifically related to cylinder 2 injector circuit high. Typical symptoms include flashing check engine light, poor fuel economy, loss of power. Given the high severity of this code, continuing to drive risks significant mechanical damage. Have it diagnosed immediately.
Symptoms
Flashing check engine light, poor fuel economy, loss of power
Common Causes
- Short to power in Cylinder 2 injector circuit
- Failed fuel injector
- Damaged wiring near hot exhaust components
- Internal PCM short
How to Fix
- 1 Locate and fix shorted wire
- 2 Replace Cylinder 2 injector
- 3 Reroute wiring away from heat sources
- 4 Test PCM output voltage
Technical Explanation
Code P0265 is confirmed when the ECM's diagnostic algorithm detects a parameter deviation that persists across a defined number of consecutive drive cycles. For injector-specific codes, the ECM monitors the injector control circuit voltage drop during each pulse; a shorted or open injector presents a characteristic resistance signature that differs measurably from a healthy unit. The MIL illuminates after the fault is confirmed on two consecutive drive cycles, and the freeze frame data captured at first detection is stored in the PCM's memory for diagnostic reference.
Is It Safe to Drive?
An active P0265 code under high-severity conditions means the affected system is operating outside safe parameters. Continued driving — especially under load or at highway speeds — significantly increases the risk of secondary damage to components like failed fuel injector.
Mechanic's Pro Tip
Module replacement should always be the last resort for P0265 after exhaustively verifying all power supply circuits, ground connections, and communication bus wiring. Use a wiring diagram to locate all fuses, relays, and ground points for the affected module, and measure voltage drop on each ground with the circuit loaded. A module "failure" is frequently a corroded ground eyelet or a weak battery causing brownout conditions — fix these first and you'll save hundreds of dollars on an unnecessary module replacement.
Injector: $200 - $450; Wiring: $100 - $200