Injection Pump Fuel Calibration Not Learned
The P2674 code indicates that the engine control module (ECM) has not completed the fuel calibration learning process for the injection pump. This typically occurs after replacing the injection pump or ECM, or after a battery disconnect. The ECM needs to learn the pump's fuel delivery characteristics to ensure proper fuel metering and timing. Without this calibration, the engine may run poorly, experience reduced power, or fail to start.
1. Most Common Causes
- Injection pump replacement without performing calibration
- ECM replacement or reprogramming
- Battery or power loss causing loss of learned values
- Faulty injection pump or ECM
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting or no start
- Rough idle or misfire
- Reduced engine power and poor acceleration
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to check for P2674 and any other codes.
Step 2: Verify that the injection pump is properly installed and all connections are secure.
Step 3: Perform the fuel calibration learning procedure using a professional scan tool (e.g., bi-directional control to initiate 'injection pump calibration' or 'fuel system learn').
Step 4: If calibration fails, inspect the injection pump and ECM for faults; replace as necessary.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause poor engine performance, stalling, or difficulty starting. Have the calibration performed as soon as possible.
How much does it cost to fix?▼
The cost to perform the fuel calibration learning procedure typically ranges from $50 to $150 at a shop. If the injection pump or ECM needs replacement, costs can be significantly higher.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.