EGR Calibration Low
The engine computer detected that the EGR (Exhaust Gas Recirculation) system's calibration values are reading lower than expected, similar to a thermostat reporting the room is colder than it actually is. This prevents the EGR system from properly controlling emissions by recirculating exhaust gases.
The ECM monitors EGR flow rates and valve position feedback during system operation. It compares actual calibration parameters against stored baseline values to verify the EGR system is functioning within specification. If calibration data reads consistently below the minimum threshold, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| EGR Calibration Value | Within ±5% of baseline | Below minimum baseline threshold |
| EGR Flow Rate | Expected flow range at given load | Flow insufficient for calibration match |
Code P1313 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, P1313 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.