Injector Circuit / IDM Codes Detected
The engine's computer detected a problem with the fuel injector circuit or the Injector Driver Module (IDM) that controls them—like a miscommunication between the brain and the fuel delivery system. This prevents proper fuel spray timing and amount, disrupting combustion.
The ECM monitors injector pulse width, timing signals from the IDM, and feedback circuits for voltage/current irregularities. It detects open circuits, shorts, or signal timing mismatches between commanded and actual injector operation. If voltage or current deviates beyond acceptable ranges, the fault code triggers.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Injector Drive Voltage | 12-14.5V during pulse | <10V or >15V, or no signal detected |
| IDM Communication Signal | Stable PWM at expected frequency | Erratic, missing, or inverted signal pulses |
Code P1345 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, P1345 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.