P0295
Cylinder 12 Injector Circuit High
If your code reader dashboard displays the generic DTC error code P0295, your vehicle is currently experiencing an active failure related to "Cylinder 12 Injector Circuit High". Proper system troubleshooting is required to safely clear this warning.
Driver's Summary
The diagnostic trouble code P0295 indicates an active fault in the cylinder 12 injector circuit high circuit or component. Drivers typically experience engine misfire, raw fuel smell from exhaust when this code is active. This is a serious fault — avoid extended driving and have your vehicle inspected by a mechanic as soon as possible to prevent further damage.
Symptoms
Engine misfire, raw fuel smell from exhaust
Common Causes
- Short to voltage on Cyl 12 control wire
- Internally failed injector
- Wiring harness rubbed through insulation
- PCM fault
How to Fix
- 1 Inspect and repair wiring harness
- 2 Replace fuel injector
- 3 Tape and secure rubbed wiring
- 4 Test PCM
Technical Explanation
Detection of P0295 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 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 P0295 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 internally failed injector.
Mechanic's Pro Tip
Module replacement should always be the last resort for P0295 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 replacement: 200 - 500