Cylinder 5 Injector Circuit High
The ECU detected that cylinder 5's fuel injector circuit is receiving too much voltage, similar to a light switch stuck in the 'on' position sending excess current. This prevents the injector from operating correctly, disrupting fuel delivery to that cylinder.
The ECU monitors the voltage and current flowing through the cylinder 5 injector circuit during opening and closing cycles. It expects specific voltage levels within a narrow range when the injector fires. If voltage exceeds the high threshold for an extended duration, the ECU detects a circuit high fault condition.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Injector Circuit Voltage | 12-14.5V during operation | >14.5V sustained or open circuit detected |
| Injector Current Draw | 1-4 amps during pulse | Excessive current or no current load |
Code P0275 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0275 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.