Multi-faults - Bank 2 - With Low Side Shorts
Your engine's Bank 2 fuel injectors or ignition coils are experiencing electrical short circuits to ground, preventing them from firing correctly. It's like trying to light a match while water keeps shorting out the spark.
The ECM monitors the low-side driver circuit voltage and current draw for Bank 2 injectors or coils. When resistance drops abnormally low or current spikes beyond expected levels, it detects a short to ground. The ECU compares actual voltage/current patterns against calibrated thresholds to identify the fault condition.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Injector/Coil Driver Current | 2-4 amps during pulse | Exceeds 5+ amps or continuous drain |
| Circuit Voltage Drop | 0.5-2 volts at load | Less than 0.2 volts or erratic |
Code P1301 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, P1301 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.