Injection Pump Fuel Calibration Not Learned
The P2674 code indicates that the engine control module (ECM) has not successfully learned the fuel calibration values for the injection pump. This typically occurs after replacing the injection pump or ECM, or after a battery disconnect, and prevents the engine from running optimally. The ECM uses this calibration to precisely control fuel injection timing and quantity for proper combustion.
01. Most Common Causes
- Injection pump replacement without performing calibration learn procedure
- ECM replacement or software update
- Battery disconnection or low voltage during learn procedure
- Faulty injection pump or ECM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine hard to start or no start
- Rough idle or poor engine performance
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and verify P2674 is present. Check for other related codes.
Step 2: Perform the injection pump calibration learn procedure using a professional scan tool (e.g., bidirectional control). Follow manufacturer-specific steps (e.g., key cycle, throttle position).
Step 3: If learn fails, inspect injection pump wiring and connectors for damage or corrosion. Check battery voltage and ensure it's above 12.6V.
Step 4: If wiring and voltage are OK, the injection pump or ECM may be faulty. Replace and repeat learn procedure.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The engine may run poorly, stall, or fail to start, which could be dangerous in traffic.
How much does it cost to fix?▼
If only a calibration learn is needed, a shop may charge $50-$150. If parts need replacement, costs increase significantly.